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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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  • 12.10: login screen never goes blank

    - by Marciano Siniscalchi
    I have installed the 12.10 beta (with all updates) on my iMac Early 2008. One annoying problem I'm having is that, when I log out of my account and go back to the login screen (lightdm, per default), the screen stays on: it never goes blank. This is not good for my display I guess! The screensaver (set to just a blank screen) works just fine when I'm logged in. The problem only appears at the login screen. Any ideas?

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  • What free space thresholds/limits are advisable for 640 GB and 2 TB hard disk drives with ZEVO ZFS on OS X?

    - by Graham Perrin
    Assuming that free space advice for ZEVO will not differ from advice for other modern implementations of ZFS … Question Please, what percentages or amounts of free space are advisable for hard disk drives of the following sizes? 640 GB 2 TB Thoughts A standard answer for modern implementations of ZFS might be "no more than 96 percent full". However if apply that to (say) a single-disk 640 GB dataset where some of the files most commonly used (by VirtualBox) are larger than 15 GB each, then I guess that blocks for those files will become sub optimally spread across the platters with around 26 GB free. I read that in most cases, fragmentation and defragmentation should not be a concern with ZFS. Sill, I like the mental picture of most fragments of a large .vdi in reasonably close proximity to each other. (Do features of ZFS make that wish for proximity too old-fashioned?) Side note: there might arise the question of how to optimise performance after a threshold is 'broken'. If it arises, I'll keep it separate. Background On a 640 GB StoreJet Transcend (product ID 0x2329) in the past I probably went beyond an advisable threshold. Currently the largest file is around 17 GB –  – and I doubt that any .vdi or other file on this disk will grow beyond 40 GB. (Ignore the purple masses, those are bundles of 8 MB band files.) Without HFS Plus: the thresholds of twenty, ten and five percent that I associate with Mobile Time Machine file system need not apply. I currently use ZEVO Community Edition 1.1.1 with Mountain Lion, OS X 10.8.2, but I'd like answers to be not too version-specific. References, chronological order ZFS Block Allocation (Jeff Bonwick's Blog) (2006-11-04) Space Maps (Jeff Bonwick's Blog) (2007-09-13) Doubling Exchange Performance (Bizarre ! Vous avez dit Bizarre ?) (2010-03-11) … So to solve this problem, what went in 2010/Q1 software release is multifold. The most important thing is: we increased the threshold at which we switched from 'first fit' (go fast) to 'best fit' (pack tight) from 70% full to 96% full. With TB drives, each slab is at least 5GB and 4% is still 200MB plenty of space and no need to do anything radical before that. This gave us the biggest bang. Second, instead of trying to reuse the same primary slabs until it failed an allocation we decided to stop giving the primary slab this preferential threatment as soon as the biggest allocation that could be satisfied by a slab was down to 128K (metaslab_df_alloc_threshold). At that point we were ready to switch to another slab that had more free space. We also decided to reduce the SMO bonus. Before, a slab that was 50% empty was preferred over slabs that had never been used. In order to foster more write aggregation, we reduced the threshold to 33% empty. This means that a random write workload now spread to more slabs where each one will have larger amount of free space leading to more write aggregation. Finally we also saw that slab loading was contributing to lower performance and implemented a slab prefetch mechanism to reduce down time associated with that operation. The conjunction of all these changes lead to 50% improved OLTP and 70% reduced variability from run to run … OLTP Improvements in Sun Storage 7000 2010.Q1 (Performance Profiles) (2010-03-11) Alasdair on Everything » ZFS runs really slowly when free disk usage goes above 80% (2010-07-18) where commentary includes: … OpenSolaris has changed this in onnv revision 11146 … [CFT] Improved ZFS metaslab code (faster write speed) (2010-08-22)

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  • Blank space on right side of screen with XMonad/Gnome

    - by Andrew
    Fresh install of 11.10 x64. I set up XMonad with gnome-session as I did before on 11.04, following the guide on the Arch wiki. Everything works, but there's this weird vertical space about the size of a scrollbar on the side of the screen. The space is also above xmobar (the battery system tray icon is hidden behind it and I can't click it). XMonad weird space (since I can't post images) Is there some weird XMonad or Gnome option I'm missing? I don't even know where to begin to look.

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  • How does memory protection in SASOS works?

    - by chris
    I'd like to know how it works - whether it checks if process can read/write/execute memory on every access, or it does it only once? But when it does it only once, and all processes are in a single address space, how are these other hostile processes are prevented from accessing memory from not their's areas?

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  • Installation failed with a Blank Screen

    - by Bear
    Blank Screen, no Fix I've tried works... Hardware conflict maybe? First I tried AMD64 Ubuntu desktop. I got into the boot screen, however selecting install returns 1-2 seconds of code then blank screen no-idle. Then I tried the alternate install. Worked, some additional software installs failed. Go to boot for first time, I see BIOS load then black/blank screen. No flicker or cursor... screen turns off. (I am also having issues installing any 64bit OS legit WIN 7 64 Ult., WinXP 64 PRO ISO, also WinXP 32 Legit, WinXP 64Pro ISO returns BSOD on install. All win 7 builds return with CD/DVD driver error. The only OS that installs is beta build 7000 win 7.) Please help! I am using: BIOS Build = E7696AMS V1.5 HDD = Hitachi HDP725050GLA 500.00 GB (SATA) CDD = Optiarc DVD RW AD-72 (SATA) MOBO = MSI A75MA-G55 AMD A Series Motherboard - Micro ATX, Socket FM1, AMD A75 Chipset, 1866MHz DDR3 (O.C.), SATA 6.0 Gb/s, 8-CH Audio, Gigabit LAN, SuperSpeed USB 3.0, AMD Dual Graphics Ready CPU = AMD A6-Series AD3650WNGXBOX Quad-Core A6-3650 APU - 4MB L2 Cache, 2.6GHz, Socket FM1, Radeon HD 6530D (320 Cores), Dual Graphics Ready, DirectX 11 RAM = Corsair CMZ16GX3M4A1600C9B Vengeance Desktop Memory Kit - 16GB (4x 4GB), PC3-12800, DDR3-1600MHz, 9-9-9-24 CAS Latency, Intel XMP Ready, Unbuffered

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  • Blank screen after Switch User or Resume

    - by matt wilkie
    About half the time when I switch users or resume from standby or resume the screen goes blank (black). If I work the cursor keys I can hear the system bell when it gets to the end of the user list. I can also successfully login, going from memory, but screen stays black. Sometimes closing and re-opening the lid will light up the screen again. Pressing the special Function key to enable/disable external monitor connection has no effect [Fn]-[F5],[Fn]-[F6]. If none of the previous work I need to put the computer into hibernation or full power off to restore screen function. If I watch closely when switching users I think I can see the screen initially start to light up and then quickly fade to black. The computer is an Acer Aspire 3500, model ZL6, running Ubuntu 10.10 installed 2 days ago. No proprietary drivers are in use. I'll provide a list of hardware details as soon as I can figure out how to generate that (didn't there used to be an entry for hardware details under the System menu?). Possibly related questions: No resume after Hibernate or Standby When I resume from suspension - the screen is blank Switch user fails to complete successfully For what it's worth, blank after resume also used to happen occasionally when the laptop was running XP-Home, but nowhere near as often, perhaps 6 or 8 times a year. UPDATE: I found System Administration System Testing and ran the Monitor test. It went very very dark, but the window elements could be discerned, and the whole screen flashed (from very very dark to black). On the third repeat of that same test the screen went to full blaupck and stayed there. Moving the mouse, via touchpad, or touch keys did not wake it up again. I had to close the lid and put the computer into hibernate, and press the power button to restore it. UPDATE2: output of lshw: http://pastebin.com/q7n8676r, lspci: http://pastebin.com/6ujzVK4r UPDATE3: sometimes I can restore the screen by flipping to console 1 with ctrl-alt-F1 and then back to graphical with ctrl-alt-F7.

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  • Blank screen during boot after clean Ubuntu 11.10 install (Intel N10 graphics)

    - by Coen
    After a clean install of Ubuntu 11.10 on my Asus eee PC 1005p, Ubuntu seems to boot correctly, except for initialization of the LCD screen. What I observe: I choose Ubuntu 11.10 in the GRUB 2 menu A blank screen with a blinking cursor in the top left of the screen, for 15-20 seconds. The ubuntu logo with 5 red dots in the center of the screen, for 1 second. The LCD screen is entirely blank The startup sound plays (Ubuntu is configured to auto-login) Still, the LCD screen is entirely blank. When I press Fn-F8 (the switch between LCD screen and external VGA), the LCD screen shows my desktop correctly and everything seems to work fine. Except for the adjust contrast buttons (Fn-F5 and Fn-F6), these seem to cycle through random brightness modes. Something like: 0% - 50% - 20% - 0% - 20% - 0% Any ideas what's causing this or how to solve this? coen@elpicu:~$ lspci -v 00:02.0 VGA compatible controller: Intel Corporation N10 Family Integrated Graphics Controller (prog-if 00 [VGA controller]) Subsystem: ASUSTeK Computer Inc. Device 83ac Flags: bus master, fast devsel, latency 0, IRQ 44 Memory at f7e00000 (32-bit, non-prefetchable) [size=512K] I/O ports at dc00 [size=8] Memory at d0000000 (32-bit, prefetchable) [size=256M] Memory at f7d00000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at <unassigned> [disabled] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 00:02.1 Display controller: Intel Corporation N10 Family Integrated Graphics Controller Subsystem: ASUSTeK Computer Inc. Device 83ac Flags: bus master, fast devsel, latency 0 Memory at f7e80000 (32-bit, non-prefetchable) [size=512K] Capabilities: <access denied>

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  • how to invoke java.exe in bash under windows in cygwin with space in path

    - by Boris
    Hi, I tried to invoke java inside bash script on windows (Win XP) using cygwin. However path to java.exe contain spaces. only literaly putting in bash sometghing like this worked: /cygdrive/c/Program\ Files/Java/jdk1.5.0_10/bin/java -cp "$TOOL_HOME" DateParse "$DATE" "$FORMAT" My attemts to put java path to a variable failed: export JAVA_EXE="/cygdrive/c/Program\ Files/Java/jdk1.5.0_10/bin/java" $JAVA_EXE -cp "$TOOL_HOME" DateParse "$DATE" "$FORMAT" also different combination with cygpath, quotes, brackets did not work. I am not finding the the right combination

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  • Sublinear Extra Space MergeSort

    - by hulkmeister
    I am reviewing basic algorithms from a book called Algorithms by Robert Sedgewick, and I came across a problem in MergeSort that I am, sad to say, having difficulty solving. The problem is below: Sublinear Extra Space. Develop a merge implementation that reduces that extra space requirement to max(M, N/M), based on the following idea: Divide the array into N/M blocks of size M (for simplicity in this description, assume that N is a multiple of M). Then, (i) considering the blocks as items with their first key as the sort key, sort them using selection sort; and (ii) run through the array merging the first block with the second, then the second block with the third, and so forth. The problem I have with the problem is that based on the idea Sedgewick recommends, the following set of arrays will not be sorted: {0, 10, 12}, {3, 9, 11}, {5, 8, 13}. The algorithm I use is the following: Divide the full array into subarrays of size M. Run Selection Sort on each of the subarrays. Merge each of the subarrays using the method Sedgwick recommends in (ii). (This is where I encounter the problem of where to store the results after the merge.) This leads to wanting to increase the size of the auxiliary space needed to handle at least two subarrays at a time (for merging), but based on the specifications of the problem, that is not allowed. I have also considered using the original array as space for one subarray and using the auxiliary space for the second subarray. However, I can't envision a solution that does not end up overwriting the entries of the first subarray. Any ideas on other ways this can be done? NOTE: If this is suppose to be on StackOverflow.com, please let me know how I can move it. I posted here because the question was academic.

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  • Why is clip space always referred to as "homogeneous clip space"?

    - by Nathan Ridley
    I've noticed in almost everything I've read so far that the term "clip space" is prepended with the word "homogeneous". Now I understand that it roughly means "all the same", but I don't understand why there is the express need to say "homogeneous clip space". When is clip space not homogeneous and why do we need to differentiate? And for that matter, what exactly does it mean that we're calling it "homogeneous clip space"? Homogenous in relation to what? In what way are the vertices "all the same"?

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  • AutoKey inserts blank lines

    - by Mike Pretzlaw
    Situation GNOME Shell AutoKey / autokey-gtk it has a predefined shortcut "adr" which should write an address after hitting space and a shortcut "date" which should write the current date (after hitting tab) Problem no matter what I define, "adr" or "date" it always inserts as much blank lines as the template uses Example: "date" should autocomplete after pressing space to "13/08/01" but it inserts one empty line "adr" should do my full address but it inserts 4 empty lines Question What could be wrong with my AutoKey? Do you need additional information?

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  • How to allocate unallocated space of hard disk in Ubuntu 12.4 after installation

    - by user171351
    How to allocate unallocated space of hard disk in Ubuntu 12.04 after installation. My system is running fine with Windows and Linux. I am using Windows rarely and for my official purpose I am using Ubuntu 12.04. I forgot to allocate around 100 GB of space while installing. Now 100 GB is free in HDD and its not usable. How can I allocate that free space as another volume without formatting the current OS?

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  • Space-efficient data structures for broad-phase collision detection

    - by Marian Ivanov
    As far as I know, these are three types of data structures that can be used for collision detection broadphase: Unsorted arrays: Check every object againist every object - O(n^2) time; O(log n) space. It's so slow, it's useless if n isn't really small. for (i=1;i<objects;i++){ for(j=0;j<i;j++) narrowPhase(i,j); }; Sorted arrays: Sort the objects, so that you get O(n^(2-1/k)) for k dimensions O(n^1.5) for 2d and O(n^1.67) for 3d and O(n) space. Assuming the space is 2D and sortedArray is sorted so that if the object begins in sortedArray[i] and another object ends at sortedArray[i-1]; they don't collide Heaps of stacks: Divide the objects between a heap of stacks, so that you only have to check the bucket, its children and its parents - O(n log n) time, but O(n^2) space. This is probably the most frequently used approach. Is there a way of having O(n log n) time with less space? When is it more efficient to use sorted arrays over heaps and vice versa?

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  • Sharing swap space between Windows and Ubuntu

    - by Leftium
    This Linux Swap Space Mini-HOWTO describes how to share swap space between Windows and Linux. Do these instructions still apply to Ubuntu in 2011? How should I modify the steps for Ubuntu? Is there a better approach to sharing swap space? Based on the HOWTO, it seems best to create a dedicated NTFS swap partition: Dedicated so the swap file will be contiguous and remain unfragmented. NTFS so both Windows and Ubuntu can read/write to it. (Or is FAT32 better for this purpose?) Then, configure Ubuntu to prepare the swap space for use by Linux on start up; by Windows on shut down. I want to dual boot Ubuntu and Windows 7 on my X301 laptop. However, my laptop only has a 64 GB SDD, so I would like to conserve as much disk space as possible. update: There is an alternate method using a special driver for Windows that let you use a Linux swap partition for temporary storage like a RAM-disk, but it doesn't seem to be as good...

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  • Is there a way for Windows 7 to show remaining disk space in the status bar?

    - by Matt Thompson
    This is really driving me nuts. I do a lot of moving media files to and from USB drives, and I am constantly looking to the status bar to see how much remaining space I have on a drive. It's quick, and doesn't involve any clicking. At least, that's what I used to do using Windows XP. Is there a way to get the status bar in Windows 7 to behave in the same way? I saw in a Wikipedia article that some features have been removed from Windows 7, including these two that seem to be affecting me the most: The size of any selected item and free disk space are not shown on the status bar. When no items are selected in a folder, neither the details pane nor the status bar show the total size of files in the folder. Are there any plug-ins or registry tweaks that can be made to return this functionality? If not what is the quickest way to get the remaining space on a drive without having to click on something and leaving the directory you are working in?

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  • How to watch disk free space change on Linux?

    - by Bob
    As the title implies, I want to know how to watch disk free space change on Linux instead polling it periodically via statfs. When the free space is changed, a signal is emitted to allow the application having a chance to handle the change event. On Windows, it can be done by FindFirstChangeNotification with FILE_NOTIFY_CHANGE_SIZE. When the free space is changed, the HANDLE object returend by FindFirstChangeNotification gets signaled and let application do something. Is there any similar way to do that on Linux? Thanks.

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  • View space lighting in deferred shading

    - by kochol
    I implemented a simple deferred shading renderer. I use 3 G-Buffer for storing position (R32F), normal (G16R16F) and albedo (ARGB8). I use sphere map algorithm to store normals in world space. Currently I use inverse of view * projection matrix to calculate the position of each pixel from stored depth value. First I want to avoid per pixel matrix multiplication for calculating the position. Is there another way to store and calculate position in G-Buffer without the need of matrix multiplication Store the normal in view space Every lighting in my engine is in world space and I want do the lighting in view space to speed up my lighting pass. I want an optimized lighting pass for my deferred engine.

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  • Resize hard drive partition to make more space for /var

    - by user3357381
    I am running out of space in the /var partition. I have plenty of space in my /home partition. How do I shrink the /home partition to make more space for the /var partition? I have read some blogs that say to use the GParted Live CD. As a new user, I'm not quite sure if this is the ideal route. What is the best way to create more space for /var ? Output of df -h : Filesystem Size Used Avail Use% Mounted on /dev/sda2 19G 7.1G 11G 41% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 7.9G 8.0K 7.9G 1% /dev tmpfs 1.6G 1.5M 1.6G 1% /run none 5.0M 0 5.0M 0% /run/lock none 7.9G 624K 7.9G 1% /run/shm none 100M 60K 100M 1% /run/user /dev/sda4 454M 75M 352M 18% /boot /dev/sda5 2.3G 2.1G 36M 99% /var /dev/sda3 178G 1.3G 168G 1% /home /dev/sda6 2.8G 5.8M 2.6G 1% /tmp /dev/sdb1 3.7T 401G 3.3T 11% /hdd

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  • Why doesn't Windows XP show "Total Size" and "Free Space" for USB flash disks?

    - by Mehper C. Palavuzlar
    When I double click on My Computer, I can immediately see the Total size and Free space for internal and external HDDs, and inserted CD/DVD media, but in the same columns I cannot see these values for any USB flash drives. They are just empty. To see, I have to right click on USB drive letter, and select Properties. Is there a trick to make Windows XP display USB drive's Total size and Free space in My Computer window?

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  • Groups page is blank in SharePoint 2010 [migrated]

    - by Murali Ramakrishnan
    Sometimes it's very confusing how Sharepoint 2010 group creation works Here's a scenario we have been facing from a long time wrt groups in SharePoint 2010 We had requirement of creating a two custom groups followed by creating a custom site through programmatically, For the most case the scenario works as how it is excepted to work. but, out of 1/100 site creation process the groups creation fails, which means we were able to access the group and users associated with it through programmatically. but, when it comes to UI stand point if you try to access the specific group page from the site permissions page - SharePoint returns a BLANK WHITE Page... BLANK WHITE Page... nothing else... Ain't is this a Sharepoint 2010 issue. or anybody had this problem and fixed it. Kindly share your thoughts

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  • Netbeans shows only blank window

    - by aGr
    I am not able to launch Netbeans. When I launch it for the first time I normally get the netbeans splash screen, but after that nothing happens. When I try to launch it again, a small blank window appears. I am able to enlarge the window, but it is completely blank. Any ideas? As far as I remember this didn't come after some update/new install or whatever. Netbeans worked perfectly, but then all from the sudden...

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  • Blank Processes (?) in Natty Narwhal

    - by A Hylian Human
    I've noticed that there a seemingly blank processes (no process name, no cmdline info, only an ID), which also appear to cause my CPU to be running like crazy. My fans are going pretty much full speed and I have no idea what to do. Restarting does not help. Whenever I try to kill the process IDs, nothing happens. It's like new blank processes are continuously being created. I am really surprised that I am able to write up this question without Firefox lagging like crazy (and trust me, it's not Firefox causing the issue, as far as I can tell).

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  • Trouble installing 12.04 from cd, blank screen with cursor

    - by Master Morality
    I should preface this with saying that this is not my first rodeo. I started playing with Linux in 1999 (Red Hat) and I'm currently typing this on a ThinkPad running 12.04... When I put in the live cd, I boots, and I can get to the option menu to decide whether to install/run etc, but at any point beyond that I get only a single caret. I can type stuff in, but it goes no where. I've tried the usual stuff like running with nomodeset (thinking it was the intel HD400 graphics, but it is integrated graphics...) here is the setup: ASUS p8z77 pro (with the Atheros AR9485 wifi supposedly, but I'm not that far yet) i7 3370k 8gig X 2 G.Skill Crucial M4 (256 gig) LG Super-multi DVD re-writer no video card UPDATE: I though may be it was a bad image on the CD, so I downloaded another iso, and used a USB disk. now it boots to a blank screen. I can see the "press any key to get options" screen, but after that, it just goes to a blank screen.

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