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• Suspend not working after kernel update on an HP Envy14 1050

  - by leoxweb

  I just update ubuntu 12.04 to the kernel 3.2.0-30 and together with it a lot of packeges in the system. I am running it on an HP Envy14 1050. When I first made a fresh install of the clean ubuntu 12.04 I had the problem that when restoring from suspend the screen was black, although some backlight was there. I could fix it following this https://bugs.launchpad.net/ubuntu/+source/linux/+bug/989674/comments/20. Now, after the update the black screen after suspend has reappeared but with no backlight at all and the led in the caps lock key blinking. The laptop is using a ATI radeon 5600 with the privative drivers. During the update process there was an error with depmod . You can see the /var/log/dist-upgrade/apt-term.log file at the end. UPDATE: suspend is not working at all. The problem is not when restoring from suspend, but when I try to suspend the system it gets blocked and the fan running. Only option is to press power button. Log started: 2012-09-12 00:46:46 (Reading database ... 198909 files and directories currently installed.) Removing icedtea-7-jre-cacao ... Selecting previously unselected package linux-image-3.2.0-30-generic. (Reading database ... 198901 files and directories currently installed.) Unpacking linux-image-3.2.0-30-generic (from .../linux-image-3.2.0-30-generic_3.2.0-30.48_amd64.deb) ... Done. Preparing to replace icedtea-7-jre-jamvm 7~u3-2.1.1~pre1-1ubuntu3 (using .../icedtea-7-jre-jamvm_7u7-2.3.2-1ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement icedtea-7-jre-jamvm ... Preparing to replace openjdk-7-jre-lib 7~u3-2.1.1~pre1-1ubuntu3 (using .../openjdk-7-jre-lib_7u7-2.3.2-1ubuntu0.12.04.1_all.deb) ... Unpacking replacement openjdk-7-jre-lib ... Preparing to replace openjdk-7-jre-headless 7~u3-2.1.1~pre1-1ubuntu3 (using .../openjdk-7-jre-headless_7u7-2.3.2-1ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement openjdk-7-jre-headless ... Preparing to replace python-problem-report 2.0.1-0ubuntu12 (using .../python-problem-report_2.0.1-0ubuntu13_all.deb) ... Unpacking replacement python-problem-report ... Preparing to replace python-apport 2.0.1-0ubuntu12 (using .../python-apport_2.0.1-0ubuntu13_all.deb) ... Unpacking replacement python-apport ... Preparing to replace apport 2.0.1-0ubuntu12 (using .../apport_2.0.1-0ubuntu13_all.deb) ... apport stop/waiting Unpacking replacement apport ... Preparing to replace apport-gtk 2.0.1-0ubuntu12 (using .../apport-gtk_2.0.1-0ubuntu13_all.deb) ... Unpacking replacement apport-gtk ... Preparing to replace firefox-globalmenu 15.0+build1-0ubuntu0.12.04.1 (using .../firefox-globalmenu_15.0.1+build1-0ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement firefox-globalmenu ... Preparing to replace firefox 15.0+build1-0ubuntu0.12.04.1 (using .../firefox_15.0.1+build1-0ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement firefox ... Preparing to replace firefox-gnome-support 15.0+build1-0ubuntu0.12.04.1 (using .../firefox-gnome-support_15.0.1+build1-0ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement firefox-gnome-support ... Preparing to replace firefox-locale-en 15.0+build1-0ubuntu0.12.04.1 (using .../firefox-locale-en_15.0.1+build1-0ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement firefox-locale-en ... Preparing to replace firefox-locale-es 15.0+build1-0ubuntu0.12.04.1 (using .../firefox-locale-es_15.0.1+build1-0ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement firefox-locale-es ... Preparing to replace firefox-locale-zh-hans 15.0+build1-0ubuntu0.12.04.1 (using .../firefox-locale-zh-hans_15.0.1+build1-0ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement firefox-locale-zh-hans ... Preparing to replace totem-mozilla 3.0.1-0ubuntu21 (using .../totem-mozilla_3.0.1-0ubuntu21.1_amd64.deb) ... Unpacking replacement totem-mozilla ... Preparing to replace libtotem0 3.0.1-0ubuntu21 (using .../libtotem0_3.0.1-0ubuntu21.1_amd64.deb) ... Unpacking replacement libtotem0 ... Preparing to replace totem-plugins 3.0.1-0ubuntu21 (using .../totem-plugins_3.0.1-0ubuntu21.1_amd64.deb) ... Unpacking replacement totem-plugins ... Preparing to replace totem 3.0.1-0ubuntu21 (using .../totem_3.0.1-0ubuntu21.1_amd64.deb) ... Unpacking replacement totem ... Preparing to replace totem-common 3.0.1-0ubuntu21 (using .../totem-common_3.0.1-0ubuntu21.1_all.deb) ... Unpacking replacement totem-common ... Preparing to replace gir1.2-totem-1.0 3.0.1-0ubuntu21 (using .../gir1.2-totem-1.0_3.0.1-0ubuntu21.1_amd64.deb) ... Unpacking replacement gir1.2-totem-1.0 ... Preparing to replace glib-networking-common 2.32.1-1ubuntu1 (using .../glib-networking-common_2.32.1-1ubuntu2_all.deb) ... Unpacking replacement glib-networking-common ... Preparing to replace glib-networking 2.32.1-1ubuntu1 (using .../glib-networking_2.32.1-1ubuntu2_amd64.deb) ... Unpacking replacement glib-networking ... Preparing to replace glib-networking-services 2.32.1-1ubuntu1 (using .../glib-networking-services_2.32.1-1ubuntu2_amd64.deb) ... Unpacking replacement glib-networking-services ... Preparing to replace linux-firmware 1.79 (using .../linux-firmware_1.79.1_all.deb) ... Unpacking replacement linux-firmware ... Preparing to replace linux-generic 3.2.0.29.31 (using .../linux-generic_3.2.0.30.32_amd64.deb) ... Unpacking replacement linux-generic ... Preparing to replace linux-image-generic 3.2.0.29.31 (using .../linux-image-generic_3.2.0.30.32_amd64.deb) ... Unpacking replacement linux-image-generic ... Selecting previously unselected package linux-headers-3.2.0-30. Unpacking linux-headers-3.2.0-30 (from .../linux-headers-3.2.0-30_3.2.0-30.48_all.deb) ... Selecting previously unselected package linux-headers-3.2.0-30-generic. Unpacking linux-headers-3.2.0-30-generic (from .../linux-headers-3.2.0-30-generic_3.2.0-30.48_amd64.deb) ... Preparing to replace linux-headers-generic 3.2.0.29.31 (using .../linux-headers-generic_3.2.0.30.32_amd64.deb) ... Unpacking replacement linux-headers-generic ... Preparing to replace linux-libc-dev 3.2.0-29.46 (using .../linux-libc-dev_3.2.0-30.48_amd64.deb) ... Unpacking replacement linux-libc-dev ... Preparing to replace openjdk-7-jre 7~u3-2.1.1~pre1-1ubuntu3 (using .../openjdk-7-jre_7u7-2.3.2-1ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement openjdk-7-jre ... Preparing to replace openjdk-7-jdk 7~u3-2.1.1~pre1-1ubuntu3 (using .../openjdk-7-jdk_7u7-2.3.2-1ubuntu0.12.04.1_amd64.deb) ... Unpacking replacement openjdk-7-jdk ... Preparing to replace policykit-1-gnome 0.105-1ubuntu3 (using .../policykit-1-gnome_0.105-1ubuntu3.1_amd64.deb) ... Unpacking replacement policykit-1-gnome ... Preparing to replace xserver-xorg-input-synaptics 1.6.2-1ubuntu1~precise1 (using .../xserver-xorg-input-synaptics_1.6.2-1ubuntu1~precise2_amd64.deb) ... Unpacking replacement xserver-xorg-input-synaptics ... Processing triggers for ureadahead ... ureadahead will be reprofiled on next reboot Processing triggers for hicolor-icon-theme ... Processing triggers for shared-mime-info ... Unknown media type in type 'all/all' Unknown media type in type 'all/allfiles' Unknown media type in type 'uri/mms' Unknown media type in type 'uri/mmst' Unknown media type in type 'uri/mmsu' Unknown media type in type 'uri/pnm' Unknown media type in type 'uri/rtspt' Unknown media type in type 'uri/rtspu' Processing triggers for man-db ... Processing triggers for bamfdaemon ... Rebuilding /usr/share/applications/bamf.index... Processing triggers for desktop-file-utils ... Processing triggers for gnome-menus ... Processing triggers for gconf2 ... Processing triggers for libglib2.0-0:i386 ... Processing triggers for libglib2.0-0 ... Setting up linux-image-3.2.0-30-generic (3.2.0-30.48) ... Running depmod. update-initramfs: deferring update (hook will be called later) Examining /etc/kernel/postinst.d. run-parts: executing /etc/kernel/postinst.d/dkms 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic Error! Problems with depmod detected. Automatically uninstalling this module. DKMS: Install Failed (depmod problems). Module rolled back to built state. run-parts: executing /etc/kernel/postinst.d/initramfs-tools 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic update-initramfs: Generating /boot/initrd.img-3.2.0-30-generic run-parts: executing /etc/kernel/postinst.d/pm-utils 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic run-parts: executing /etc/kernel/postinst.d/update-notifier 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic run-parts: executing /etc/kernel/postinst.d/zz-update-grub 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic Generating grub.cfg ... Found linux image: /boot/vmlinuz-3.2.0-30-generic Found initrd image: /boot/initrd.img-3.2.0-30-generic Found linux image: /boot/vmlinuz-3.2.0-29-generic Found initrd image: /boot/initrd.img-3.2.0-29-generic Found linux image: /boot/vmlinuz-3.2.0-23-generic Found initrd image: /boot/initrd.img-3.2.0-23-generic Found memtest86+ image: /boot/memtest86+.bin Found Windows 7 (loader) on /dev/sda1 Found Windows Recovery Environment (loader) on /dev/sda2 Found Windows Recovery Environment (loader) on /dev/sda3 done Setting up python-problem-report (2.0.1-0ubuntu13) ... Setting up python-apport (2.0.1-0ubuntu13) ... Setting up apport (2.0.1-0ubuntu13) ... apport start/running Setting up apport-gtk (2.0.1-0ubuntu13) ... Setting up firefox (15.0.1+build1-0ubuntu0.12.04.1) ... Please restart all running instances of firefox, or you will experience problems. Setting up firefox-globalmenu (15.0.1+build1-0ubuntu0.12.04.1) ... Setting up firefox-gnome-support (15.0.1+build1-0ubuntu0.12.04.1) ... Setting up firefox-locale-en (15.0.1+build1-0ubuntu0.12.04.1) ... Setting up firefox-locale-es (15.0.1+build1-0ubuntu0.12.04.1) ... Setting up firefox-locale-zh-hans (15.0.1+build1-0ubuntu0.12.04.1) ... Setting up libtotem0 (3.0.1-0ubuntu21.1) ... Setting up totem-common (3.0.1-0ubuntu21.1) ... Setting up totem (3.0.1-0ubuntu21.1) ... Setting up totem-mozilla (3.0.1-0ubuntu21.1) ... Setting up gir1.2-totem-1.0 (3.0.1-0ubuntu21.1) ... Setting up totem-plugins (3.0.1-0ubuntu21.1) ... Setting up glib-networking-common (2.32.1-1ubuntu2) ... Setting up glib-networking-services (2.32.1-1ubuntu2) ... Setting up glib-networking (2.32.1-1ubuntu2) ... Setting up linux-firmware (1.79.1) ... Setting up linux-image-generic (3.2.0.30.32) ... Setting up linux-generic (3.2.0.30.32) ... Setting up linux-headers-3.2.0-30 (3.2.0-30.48) ... Setting up linux-headers-3.2.0-30-generic (3.2.0-30.48) ... Examining /etc/kernel/header_postinst.d. run-parts: executing /etc/kernel/header_postinst.d/dkms 3.2.0-30-generic /boot/vmlinuz-3.2.0-30-generic Setting up linux-headers-generic (3.2.0.30.32) ... Setting up linux-libc-dev (3.2.0-30.48) ... Setting up policykit-1-gnome (0.105-1ubuntu3.1) ... Setting up xserver-xorg-input-synaptics (1.6.2-1ubuntu1~precise2) ... Setting up openjdk-7-jre-headless (7u7-2.3.2-1ubuntu0.12.04.1) ... Installing new version of config file /etc/java-7-openjdk/security/java.security ... Installing new version of config file /etc/java-7-openjdk/jvm-amd64.cfg ... Setting up openjdk-7-jre-lib (7u7-2.3.2-1ubuntu0.12.04.1) ... Setting up icedtea-7-jre-jamvm (7u7-2.3.2-1ubuntu0.12.04.1) ... Setting up openjdk-7-jre (7u7-2.3.2-1ubuntu0.12.04.1) ... Setting up openjdk-7-jdk (7u7-2.3.2-1ubuntu0.12.04.1) ... update-alternatives: using /usr/lib/jvm/java-7-openjdk-amd64/bin/jcmd to provide /usr/bin/jcmd (jcmd) in auto mode. Processing triggers for libc-bin ... ldconfig deferred processing now taking place Log ended: 2012-09-12 00:49:16

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• Laptop screen blank after login when external monitor is not connected

  - by Ramon Suarez

  Ubuntu does not switch back automatically to only monitor present when booting after disconnecting external monitor. Here's a video showing what happens. I get to the login window and everything looks ok, then I type my password, the desktop image shows up and... everything goes blank. It does not happen when I just login as a guest. When possible I work with my laptop connected to an external screen via the VGA port. The problem comes when I boot the computer without that secondary screen connected: The login screen comes out ok. After login the screen goes black, but I can hear the login sound. If I hit ctr + alt + backwards-delete and login again sometimes it is fixed, but not all. If I log in as a different user everything is OK. Then I log in as my user and sometimes it works. To have a screen I have to plug a monitor. Although I have turned on the laptop display with that monitor on, if I reboot it goes blank again after login, even if I turn off the external monitor before turning off the computer. I've managed to get my screen back with my username after going into recovery mode, but only sometimes. Failsafe would not load after second screen asking me what I wanted to do (no mouse to click nor keyboard working). My computer is a LDLC Aurore BB1-i5 -8 -S1. Which is the configuration file that keeps the information about the monitors using Displays under lightgdm and where is it? I guess if I could edit it I may have a chance :) One of the things I tried following a solution in another post was removing my monitors.xml file, but it does not work and I don't know how to create a good one that I could use now. When doing DISPLAY=:0 xrandrI get: Screen 0: minimum 320 x 200, current 320 x 200, maximum 8192 x 8192 LVDS1 connected (normal left inverted right x axis y axis) 1366x768 60.0 + 1360x768 59.8 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) DP1 disconnected (normal left inverted right x axis y axis) This is the full dmesg after activating sudo xdiagnoseas Bryce sugested. (If you tell me the relevant parts I will paste them here) When conecting the external monitor, only the external will work, although I can see using Displays that the computer thinks that both are working. I've asked the question in Launchpad but have it keeps on expiring without any feedback. In my opinion Ubuntu should be able to detect automatically that there is no external monitor present and switch to the laptop monitor. There's a similar question here, but it does not apply to my case External monitor set as primary even when disconnected from laptop Update: For clarification, the problem happens only with my user and once I log in. I even get to see the screensaver for about a second, and then it goes blank. Tried Bryce's example (see his answer below), but it did not work. This is the info I get from tty1 with Display=:0 xrandr: – Ramon Suarez Jul 9 at 16:36 Screen 0: minimum 320 x 200, current 320 x 200, maximum 8192 x 8192 LVDS1 connected (normal left inverted right x axis y axis) 1366x768 60.0 + 1360x768 59.8 60.0 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) DP1 disconnected (normal left inverted right x axis y axis)

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• table with black outer, but grey inner border

  - by Jan-Frederik Carl

  Hello, I want to create a html table with a 1pt black outer border and the same border around every td. Should look like this (only the borders, of course) link text I use <table border="1" style="border-collapse:collapse; border-color:Black; border-style:solid; border-width:1pt"> As a result I get a black outer, but grey inner borders.

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• Optimized OCR black/white pixel algorithm

  - by eagle

  I am writing a simple OCR solution for a finite set of characters. That is, I know the exact way all 26 letters in the alphabet will look like. I am using C# and am able to easily determine if a given pixel should be treated as black or white. I am generating a matrix of black/white pixels for every single character. So for example, the letter I (capital i), might look like the following: 01110 00100 00100 00100 01110 Note: all points, which I use later in this post, assume that the top left pixel is (0, 0), bottom right pixel is (4, 4). 1's represent black pixels, and 0's represent white pixels. I would create a corresponding matrix in C# like this: CreateLetter("I", new List<List<bool>>() { new List<bool>() { false, true, true, true, false }, new List<bool>() { false, false, true, false, false }, new List<bool>() { false, false, true, false, false }, new List<bool>() { false, false, true, false, false }, new List<bool>() { false, true, true, true, false } }); I know I could probably optimize this part by using a multi-dimensional array instead, but let's ignore that for now, this is for illustrative purposes. Every letter is exactly the same dimensions, 10px by 11px (10px by 11px is the actual dimensions of a character in my real program. I simplified this to 5px by 5px in this posting since it is much easier to "draw" the letters using 0's and 1's on a smaller image). Now when I give it a 10px by 11px part of an image to analyze with OCR, it would need to run on every single letter (26) on every single pixel (10 * 11 = 110) which would mean 2,860 (26 * 110) iterations (in the worst case) for every single character. I was thinking this could be optimized by defining the unique characteristics of every character. So, for example, let's assume that the set of characters only consists of 5 distinct letters: I, A, O, B, and L. These might look like the following: 01110 00100 00100 01100 01000 00100 01010 01010 01010 01000 00100 01110 01010 01100 01000 00100 01010 01010 01010 01000 01110 01010 00100 01100 01110 After analyzing the unique characteristics of every character, I can significantly reduce the number of tests that need to be performed to test for a character. For example, for the "I" character, I could define it's unique characteristics as having a black pixel in the coordinate (3, 0) since no other characters have that pixel as black. So instead of testing 110 pixels for a match on the "I" character, I reduced it to a 1 pixel test. This is what it might look like for all these characters: var LetterI = new OcrLetter() { Name = "I", BlackPixels = new List<Point>() { new Point (3, 0) } } var LetterA = new OcrLetter() { Name = "A", WhitePixels = new List<Point>() { new Point(2, 4) } } var LetterO = new OcrLetter() { Name = "O", BlackPixels = new List<Point>() { new Point(3, 2) }, WhitePixels = new List<Point>() { new Point(2, 2) } } var LetterB = new OcrLetter() { Name = "B", BlackPixels = new List<Point>() { new Point(3, 1) }, WhitePixels = new List<Point>() { new Point(3, 2) } } var LetterL = new OcrLetter() { Name = "L", BlackPixels = new List<Point>() { new Point(1, 1), new Point(3, 4) }, WhitePixels = new List<Point>() { new Point(2, 2) } } This is challenging to do manually for 5 characters and gets much harder the greater the amount of letters that are added. You also want to guarantee that you have the minimum set of unique characteristics of a letter since you want it to be optimized as much as possible. I want to create an algorithm that will identify the unique characteristics of all the letters and would generate similar code to that above. I would then use this optimized black/white matrix to identify characters. How do I take the 26 letters that have all their black/white pixels filled in (e.g. the CreateLetter code block) and convert them to an optimized set of unique characteristics that define a letter (e.g. the new OcrLetter() code block)? And how would I guarantee that it is the most efficient definition set of unique characteristics (e.g. instead of defining 6 points as the unique characteristics, there might be a way to do it with 1 or 2 points, as the letter "I" in my example was able to). An alternative solution I've come up with is using a hash table, which will reduce it from 2,860 iterations to 110 iterations, a 26 time reduction. This is how it might work: I would populate it with data similar to the following: Letters["01110 00100 00100 00100 01110"] = "I"; Letters["00100 01010 01110 01010 01010"] = "A"; Letters["00100 01010 01010 01010 00100"] = "O"; Letters["01100 01010 01100 01010 01100"] = "B"; Now when I reach a location in the image to process, I convert it to a string such as: "01110 00100 00100 00100 01110" and simply find it in the hash table. This solution seems very simple, however, this still requires 110 iterations to generate this string for each letter. In big O notation, the algorithm is the same since O(110N) = O(2860N) = O(N) for N letters to process on the page. However, it is still improved by a constant factor of 26, a significant improvement (e.g. instead of it taking 26 minutes, it would take 1 minute). Update: Most of the solutions provided so far have not addressed the issue of identifying the unique characteristics of a character and rather provide alternative solutions. I am still looking for this solution which, as far as I can tell, is the only way to achieve the fastest OCR processing. I just came up with a partial solution: For each pixel, in the grid, store the letters that have it as a black pixel. Using these letters: I A O B L 01110 00100 00100 01100 01000 00100 01010 01010 01010 01000 00100 01110 01010 01100 01000 00100 01010 01010 01010 01000 01110 01010 00100 01100 01110 You would have something like this: CreatePixel(new Point(0, 0), new List<Char>() { }); CreatePixel(new Point(1, 0), new List<Char>() { 'I', 'B', 'L' }); CreatePixel(new Point(2, 0), new List<Char>() { 'I', 'A', 'O', 'B' }); CreatePixel(new Point(3, 0), new List<Char>() { 'I' }); CreatePixel(new Point(4, 0), new List<Char>() { }); CreatePixel(new Point(0, 1), new List<Char>() { }); CreatePixel(new Point(1, 1), new List<Char>() { 'A', 'B', 'L' }); CreatePixel(new Point(2, 1), new List<Char>() { 'I' }); CreatePixel(new Point(3, 1), new List<Char>() { 'A', 'O', 'B' }); // ... CreatePixel(new Point(2, 2), new List<Char>() { 'I', 'A', 'B' }); CreatePixel(new Point(3, 2), new List<Char>() { 'A', 'O' }); // ... CreatePixel(new Point(2, 4), new List<Char>() { 'I', 'O', 'B', 'L' }); CreatePixel(new Point(3, 4), new List<Char>() { 'I', 'A', 'L' }); CreatePixel(new Point(4, 4), new List<Char>() { }); Now for every letter, in order to find the unique characteristics, you need to look at which buckets it belongs to, as well as the amount of other characters in the bucket. So let's take the example of "I". We go to all the buckets it belongs to (1,0; 2,0; 3,0; ...; 3,4) and see that the one with the least amount of other characters is (3,0). In fact, it only has 1 character, meaning it must be an "I" in this case, and we found our unique characteristic. You can also do the same for pixels that would be white. Notice that bucket (2,0) contains all the letters except for "L", this means that it could be used as a white pixel test. Similarly, (2,4) doesn't contain an 'A'. Buckets that either contain all the letters or none of the letters can be discarded immediately, since these pixels can't help define a unique characteristic (e.g. 1,1; 4,0; 0,1; 4,4). It gets trickier when you don't have a 1 pixel test for a letter, for example in the case of 'O' and 'B'. Let's walk through the test for 'O'... It's contained in the following buckets: // Bucket Count Letters // 2,0 4 I, A, O, B // 3,1 3 A, O, B // 3,2 2 A, O // 2,4 4 I, O, B, L Additionally, we also have a few white pixel tests that can help: (I only listed those that are missing at most 2). The Missing Count was calculated as (5 - Bucket.Count). // Bucket Missing Count Missing Letters // 1,0 2 A, O // 1,1 2 I, O // 2,2 2 O, L // 3,4 2 O, B So now we can take the shortest black pixel bucket (3,2) and see that when we test for (3,2) we know it is either an 'A' or an 'O'. So we need an easy way to tell the difference between an 'A' and an 'O'. We could either look for a black pixel bucket that contains 'O' but not 'A' (e.g. 2,4) or a white pixel bucket that contains an 'O' but not an 'A' (e.g. 1,1). Either of these could be used in combination with the (3,2) pixel to uniquely identify the letter 'O' with only 2 tests. This seems like a simple algorithm when there are 5 characters, but how would I do this when there are 26 letters and a lot more pixels overlapping? For example, let's say that after the (3,2) pixel test, it found 10 different characters that contain the pixel (and this was the least from all the buckets). Now I need to find differences from 9 other characters instead of only 1 other character. How would I achieve my goal of getting the least amount of checks as possible, and ensure that I am not running extraneous tests?

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• Windows XP boot: black screen with cursor after BIOS screen

  - by Radio

  Here is a weird one, Got computer with Windows XP. It's getting stuck on a black screen with cursor blinking. What did I do: - Boot from installation CD (recovery option - command line): chkdsk C: /R copy D:\i386\ntdetect.com c:\ copy D:\i386\ntldr c:\ fixmbr fixboot Chkdsk showed 0 bad sectors and no problems during scan. dir on C:\ shows all directories and files in place (Windows, Program Files, Documents and Settings). BIOS shows correct boot drive. Still does not boot. Not sure what to think of. Please help. UPDATE: Just performed these steps: Backed up current disk C: (without MBR) using True Image to external hard drive Ran Windows XP clean installation with deleting all partitions and creating new one. Hard drive booted fine into Windows GUI installation!!! Then: Interrupted installation. Booted from True Image recovery CD and restored archive of disk C to an new partition. Same issue with black screen.

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• Black Berry mail server

  - by Rajat

  Hi Is there any alternative for black berry mail server in open source which integrated with postfix or zimbra community version.

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• Convert a colored PDF into a white/black

  - by polslinux

  On Debian Sid, I have a PDF with a blue background and yellow font. I've searched a lot on Super User but i haven't found anything useful for me. I have tried to convert the PDF into a grayscale one with: gs -o grayscale.pdf -sDEVICE=pdfwrite -sColorConversionStrategy=Gray -sProcessColorModel=DeviceGray -dCompatibilityLevel=1.4 colored.pdf The problem is that I obtain a PDF whit white fonts and dark grey background so I cannot print it. After that I tried: convert -density 96x96 gs2.pdf -density 96x96 -negate -compress zip inv.pdf I got a PDF with black fonts (and this is okay) and grey background (and this is not okay). What can I do to obtain a PDF with white background and black fonts?

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• Toshiba Laptop Problem - Black Screen on Startup [using Win Vista]

  - by BubblySue

  Hi guys, can anyone help me on my problem? I only see black screen after the startup.. It just shows the logo and the status bar upon start, then it goes black screen with moveable cursor. I tried alt+ctrl+del, but it doesn't work. I pressed shift 5 times and it makes a sound. I already removed battery and restarted it, but still the same. I can go to safe mode and scanned thru there. Still, desktop won't show up. Don't know what else to check? Been searching the net for solutions. Please help? :(

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• Toshiba Laptop Problem - Black Screen on Startup [using Win Vista]

  - by BubblySue

  Hi guys, can anyone help me on my problem? I only see black screen after the startup.. It just shows the logo and the status bar upon start, then it goes black screen with moveable cursor. I tried alt+ctrl+del, but it doesn't work. I pressed shift 5 times and it makes a sound. I already removed battery and restarted it, but still the same. I can go to safe mode and scanned thru there. Still, desktop won't show up. Don't know what else to check? Been searching the net for solutions. Please help? :(

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• Screenshot is black in Mac OS X SL

  - by kirbez.ya.ru

  When I press cmd+shift+3 in desktop saves black 1400x900 file Command: defaults write com.apple.screencapture disable-shadow -bool true Does not work

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• Toshiba laptop only shows black screen with mouse pointer after starting up

  - by BubblySue

  I only see black screen after the startup. It just shows the logo and the status bar upon start, then it goes black screen with moveable cursor. I tried alt+ctrl+del, but it doesn't work. I pressed shift 5 times and it makes a sound. I already removed battery and restarted it, but still the same. I can go to safe mode and scanned thru there. Still, desktop won't show up. Don't know what else to check?

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• Black screen after scheduled resume from sleep

  - by macbirdie

  I have a problem with my two Windows 7 setups at home. Whenever a scheduled task wakes up the machines from sleep, a black screen with a mouse cursor appears. If I move the mouse or press any key, desktop appears. The biggest problem is that during that black screen phase the display, sometimes even the PC too, doesn't go to stand by after a set period of time in power settings. If I get the desktop to show up, standby functions work fine. Display goes blank after a few minutes and as soon as the task doesn't need the PC, it goes back to sleep. It's frustrating that this "feature" is wasting energy and keeps lighting up the pc in the middle of the night for me to find it that way after I wake up. I found a handful of threads on the intertubes about the issue, but there were no answers in any of them. It sometimes happens in my XP machine at work as well.

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• Toshiba laptop only shows black screen with mouse pointer after starting up

  - by BubblySue

  I only see black screen after the startup. It just shows the logo and the status bar upon start, then it goes black screen with moveable cursor. I tried alt+ctrl+del, but it doesn't work. I pressed shift 5 times and it makes a sound. I already removed battery and restarted it, but still the same. I can go to safe mode and scanned thru there. Still, desktop won't show up. Don't know what else to check?

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• Black screen with cursor after BIOS screen

  - by Radio

  Here is a weird one, Got computer with Windows XP. It's getting stuck on a black screen with cursor blinking. What did I do: - Boot from installation CD (recovery option - command line): chkdsk C: /R copy D:\i386\ntdetect.com c:\ copy D:\i386\ntldr c:\ fixmbr fixboot Chkdsk showed 0 bad sectors and no problems during scan. dir on C:\ shows all directories and files in place (Windows, Program Files, Documents and Settings). BIOS shows correct boot drive. Still does not boot. Not sure what to think of. Please help. UPDATE: Just performed these steps: Backed up current disk C: (without MBR) using True Image to external hard drive Ran Windows XP clean installation with deleting all partitions and creating new one. Hard drive booted fine into Windows GUI installation!!! Then: I interrupted installation. Booted from True Image recovery CD and restored archive of disk C to an new partition. Same issue with black screen.

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• Vista logs into black screen, "Application Error 0xc0000022" for explorer.exe

  - by IMAPC

  Whenever I attempt to log into a Windows Vista computer (the only account on it), I'm presented with a black screen & a cursor. I can open Task Manager, and from there I can launch applications. It seems to be using Aero Basic (instead of the full Aero which I had set as default before the problem started). When attempting to launch "explorer.exe" I get "explorer.exe - Application Error 'The application failed to initialize properly (0xc0000022). Click OK to terminate the application.'" Every now and then I get an error along the lines of "the application has failed to start because its side by side configuration is incorrect please see the application event log for more detail." I can boot into safe mode successfully, but I still get the black screen when I log into it in regular mode. I've tried most of the suggestions here, but did not work. I'm attempting to back up everything right now in case the only fix is to reinstall Windows. Has anyone seen this before?

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• Black Screen and System Hang - Possibly CPU overheating

  - by Mahesh

  I have this old computer - P4 2.0ghz, 1.2GB RAM and onboard graphics(no external card), 80GBHDD. It has xubuntu installed on it and it regularly hangs when it takes more system resources for say like graphical programs, too many tabs on firefox etc. It just either hangs the system or shows black screen. Tested if it was issue of HD but it wasn't because i have used linux livecd and problem is still the same even if I have removed the HD. I have also tested with USB linux (puppy linux and ubuntu linux on 8gb drives). Tested windows XP as well on this HD and results are the same. Tested another HD on this machine, results are still the same with it. System hangs or goes black screen and requires restart. I thought later it could be thermal heat issue and then applied thermal paste on heatsink but still it fails to work for me. It continues to show symptoms. Another thing which was yet to be tested is changing of CPU fan which was not done because I have not found any fan for old pentium 4 machine in the market. I have to hit online stores (but i am in india and it's hard to find it in online shops which can deliver it to me). So far I don't see this as HD or Monitor or OS issue because I have tested with other HD and results are the same. So it could be either CPU fan or motherboard? What could be possible issue with the hardware?

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• Unable to ssh in Beagle Bone Black

  - by SamuraiT

  I wanted to install pip onto beagle bone black,and I tried this: /usr/bin/ntpdate -b -s -u pool.ntp.org opkg update && opkg install python-pip python-setuptools then, it threw errors,but Unfortunately, I didn't log that errors. it was occurred a week ago and was't solved yet. I wanted to solve it now and I tried connect by ssh,but I failed. When I ping to beagle bone, it responds, and Cloud9 IDE is working too but not ssh. I don't think this is serious problem since I can connect to beagle bone by other methods: Cloud9 or so. However, to use python on beagle bone, I need to connect by ssh. Before trying to update and install python-pip, I could connect by ssh. Do you have any ideas to solve this connection problem? note I use default OS: Angstrom I don't use SD card. HOST PC is mac, OS.X 10.9 connect by USB serial I checked this but this wasn't helpful http://stackoverflow.com/questions/19233516/cannot-connect-to-beagle-bone-black I could connect by GateOne SSH client, but still unable to connect from terminal.

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• Screen randomly goes blue/black/white

  - by FubsyGamer

  Problem Randomly, while using my computer, the monitor goes dark grey/almost black, or it goes white with faint grey vertical lines, or it goes blue with black vertical lines. It's as if the computer powers off. People tell me I sign out of Skype, Spotify stops playing when it happens, etc. When I look at the tower, it doesn't seem like it's off at all. Nothing changes, fans are spinning, lights are on, etc. If you were only looking at the tower, you'd never know there was a problem The only way I can get it to come back up is to push and hold the power button and turn it off, then back on This never happens while I'm playing video games. I've done 5-6 hour sessions of League of Legends, and it doesn't do anything When I'm just browsing the web, reading email, checking Reddit, etc, it happens all the time. It can happen multiple times in a session, it usually takes only about 5 minutes from the time I start browsing to when the computer crashes This started happening after I moved to a new apartment (this has to be relevant somehow, it was not happening where I lived before) There is nothing in the crash logs or event logs System Specs i5 2500k CPU AMD Radeon 6800 GPU Gigabyte z68a-d3h-b3 motherboard WD VelociRaptor 1 TB HDD Screenshots Device manager About screen Things I have tried I was getting a WMI Error in my event logs, but I fixed it using Microsoft's fix, KB 2545227 I was using Windows 8. I wiped the HDD and downgraded to Windows 7 64 bit I took out the video card and used a can of air to totally clean out the video card, all fans, and the inside of the computer in general. I made sure all of the video card pins were fine, then reconnected it I tried to update my motherboard BIOS, but anything I downloaded from Gigabyte was only for 32 bit machines, not 64. I don't even know how to tell what my motherboard BIOS is at right now I am using a power strip, and anything else connected to it works just fine If I re-seat the monitor cable while this is happening, nothing changes Please, help me. I've been battling this for several weeks now, and it's so frustrating it makes me not even want to use the computer.

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• Acer Aspire blank screen

  - by Gerep

  I'm using Ubuntu 11.04 Natty and when I installed it I had a problem with blank screen on startup and found a solution but I have the same problem when it is inactive and goes blank screen, it won't come back, so I have to restart. Any ideas? Thanks in advance for any help. This is what solved my first problem: When you start editing the /etc/rc.local and add before exit 0: setpci -s 00:02.0 F4.B=00 Edit /etc/default/grub, edit the line GRUB_CMDLINE_LINUX_DEFAULT: GRUB_CMDLINE_LINUX_DEFAULT = "quiet splash acpi_osi = Linux" Update grub with: sudo update-grub2

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• Unable to get screen signal after purge FGLRX

  - by Boris

  I thought that my ATI driver was not running well so I wanted to re-instal it completely. I did: sudo apt-get remove --purge fglrx* sudo apt-get remove --purge xserver-xorg-video-ati xserver-xorg-video-radeon and after a boot I wanted to intal the ATI driver BUT at the boot no more signal to my screen. Since, every time I turn on my PC it gets to purple screen and then screen shuts down ! Note that: Even if the screen is off, PC seems to be running almost well: I m still able to use my network to access data shared with NFS. Using live USB I have no screen problem. I tried to plug my screen on an alternative output but it did not work. I tried CTRL+ALT+F1 while being on purple screen but it does not do anything, screen shut down anyway. I m going to try the SHIFT thing and learn from blackscreen wiki...

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• Why does my Ubuntu freeze in the middle of something with a blank screen?

  - by mohamed

  I am facing a serious problem as my Dell Optiplex 745 loaded with Ubuntu 12.04 32bit freezes with a blank screen no mouse cursor no keyboard activity in many occasions. Sometimes when I open firefox, or software center, I really can't tell what the main problem is, but what i am certain about is it i have to do a hard reset to reboot. I tried to use a live-cd to boot but it did the same, tried the recovery console but couldn't find a way to fix from there (I am a new user) suspected a hardware problem but windows runs flawlessly so I believe its something related to ubuntu. Specs: Intel Celeron D 3.06 GHZ 3.0 GB ram Intel built in graphics Q965 1 TB HDD Bios Phoenex 2.6.4 Please help I really love ubuntu and I don't want to go back to windows!

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• Screen is very dim on an Acer Aspire 6920Z

  - by Justin

  I've been trying to figure this out for a week now, my laptops screen is on and working but you cannot see whats on the screen without shining a flashlight at it. I'm using a spare monitor by the VGA port right now to be able to use this laptop, which is kinda a pain. Been reading around a bit about this problem and it seems to be a common-ish problem it seems. I've tried to change the brightness which doesn't help whats so ever. It just happen one day after I turned off the laptop for the night. The screen flashes on for a bit at start up, then goes completely dim. Anyone with this problem and find a fix? You can search up this computers spec by the name/model in the title if you need hardware info. I never had this problem with the old Ubuntu 10.04.

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• monitor screen dead.....not even shows bios screen

  - by megatronous

  Re: /host/ubuntu/disks/root.disk does not exist :( ALERT! /host/ubuntu/disks/root.siak does not exist. Dropping to a shell! BusyBox v1.15.3 (Ubuntu 1:1.15.3-1ubuntu5) built-in shell (ash) (initramfs) alll thought the above problem was solved my issue now is..when i booted my pc again after this solving this to solve the above problem i had pressed e in the grub menu then corrected the partition then after starting i did sudo grub-update then i made some automatic update updates then in next reboot......my screen had gone blank .... and i am not even able to see bios screen....in the start ...the monitior just stays blank..................i have even tried disconnectiong my hard disk but still not able to get the display......solution required ....urgently.....

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• nvidia GT 525m no screen found

  - by Pavan

  I'm a Dell XPS user with nvidia GT 525M with Optimus. When I installed nvidia I was greeted with blank screen. And the error in nvidia log was "Fatal error : No screen found". So after searching for the solutions I figured that I have to insert "BusID" in xorg.conf file. After rebooting I was again greeted with blank screen with error "Fatal error : screen already occupied". I don't what exactly the problem is. Do I need to blacklist Intel inbuilt graphics to nvidia in my machine or anything else needs to be done? Please guide me.

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• Blank Screen After Ubuntu 12 installation

  - by Atul

  On my dell laptop, running with windows 7, I installed Ubuntu 12. I used it for sometime, then i re-started to switch to windows. First time it got boot up with windows but then it got hanged. I re-started again and then blank screen with blinking cursor came and beep sounds also started to came. I read in few forums and this seems like a common issue with Ubuntu. I tried using the bootable USB for both windows 7 and Ubuntu but none of these are even getting detected. Please let me know if any of know the work-around. Below is configuration" Machine: Dell Studio BIOS: Phoenix OS: Windows 7 Motherboard: Intel

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