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  • External display suddenly not detected

    - by NChase
    I have a Lenovo IdeaPad U410 running Ubuntu Desktop 13.04. I have an external monitor that I connect to via HDMI, and it's worked flawlessly for six months. I plug in my laptop, it detects the display. The "change display" key built into the laptop works for switching between the two screens. Never any problems. This afternoon, when I reconnected my computer after taking it into another room for a bit, it didn't work. When I open up Display settings, it can't detect the display. I tried disconnecting/reconnecting everything multiple times. And most strangely, that same "change display" key now behaves like a Super key, opening the dash instead of toggling the display. Nothing at all changed between when I plugged it in this morning and when it stopped working a few hours later. I tried xrandr, that doesn't detect it either. Anyone have any ideas?

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  • Can't change screen resolution Ubuntu 10.04 (BT)

    - by Universal Coder
    I'm using Backtrack 5 R2 , what is based on Ubuntu 10.04 LTS. It is installed on Samsung Laptop , and default screen resolution in Windows for it is 1366x768 , but BT/Ubuntu Screen Resolution GUI tool (System=Preferences=Monitors) shows that only resolution available is 1024x768 , and called my monitor as "Unknown". Found a solution , that I have to change resolution in /usr/share/xresprobe/xorg.conf , but I did it , logged out/in and restarted many times , but it took me nowhere. Tried with xrandr , but it shows only mentioned 1024x768 as only solution , and when I tried to input needed resolution , but it did not accept it , because it is not available. As much as I googled , there are a lot of people that had similar problems with BT , but most of them solved with VirtualBox additional tools , but it can't help me , because I've installed it as second OS. In one forum read , that same problems is in Ubuntu 12 , so I ask this question here.

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  • frequency out of range - please change display mode

    - by Dave
    I just downloaded the latest version of the Ubuntu live CD, and have installed it on a desktop computer (a Fujitsu Scaleo P). Once installed it seems to work perfectly, although there are some updates recommended in the Update Manager. My problem is that, after having installed these updates and restarted the computer, I get this message on my monitor, and no Ubuntu interface is visible: frequency out of range - please change display mode I do not know how to change this when I can't access an interface. Is there a command that will bypass trying to boot the GUI and let me change the display mode via a CLI? I am brand new to Ubuntu and any help on this would be much appreciated.

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  • Switching to an external display, when primary is broken

    - by Shazzner
    I've successfully install Ubuntu 11.10 Desktop (x86) on an old(er) laptop that unfortunately has a broken screen, so there is an external monitor plugged in. On the livecd it come up on the secondary display just fine and I was able to install ubuntu and everything. Unfortunately when I reboot into Ubuntu proper now, the secondary display is off and I'm literally driving blind here trying to switch it to the secondary display. Using Nvidia open source drivers. Things I've tried: Rebooting back into livecd, mounting the partition and trying in vain to find a config file (it uses the open source drivers so no Xorg.conf I could edit manually) Trying to blind-type xrandr settings into what I hope is terminal: xrandr --output VGA1 --auto (nothing happened) Trying to blind install openssh-server so I could ssh into it and maybe configure it from my working computer. For some reason though, no luck. Ubuntu really should default to expanding to all screens for this use case.

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  • Facing unity problems after upgrading to Ubuntu 12.04

    - by sh2515
    I upgraded to 12.04 and had problems with unity. So this is what I did 1) Ctrl + Alt + F1 sudo apt-get install compizconfig-settings-manager Export DISPLAY=:0 ccsm 2) Ctrl + Alt + F7 3) Enabled unityplugin 4) Ctrl + Alt + F1 unity --replace it worked with a couple of error messages now I have to put in start up application export DISPLAY=:0 unity --replace NVIDIA software recognises my monitor but ubuntu sees it as laptop. something isn't right can someone point out what info I need to put here for people to help. I have been upgrading this from 8 ish so have altered lots especially when compiz fusion first came out. Also if I run recovery session and type 'unity --replace' it starts and runs fine.

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  • Performance: use a BinaryReader on a MemoryStream to read a byte array, or read directly?

    - by Virtlink
    I would like to know whether using a BinaryReader on a MemoryStream created from a byte array (byte[]) would reduce performance significantly. There is binary data I want to read, and I get that data as an array of bytes. I am currently deciding between two approaches to read the data, and have to implement many reading methods accordingly. After each reading action, I need the position right after the read data, and therefor I am considering using a BinaryReader. The first, non-BinaryReader approach: object Read(byte[] data, ref int offset); The second approach: object Read(BinaryReader reader); Such Read() methods will be called very often, in succession on the same data until all data has been read. So, using a BinaryReader feels more natural, but has it much impact on the performance?

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  • Is there a performance advantage in using a 64bit version of openCV+Emgu instead of 32bit?

    - by Jelly Amma
    Hello, I am developing an application that processes images captured in real time by a Point Grey camera (http://www.ptgrey.com/). The Point Grey SDK is a .net wrapper and can be either 32bit or 64bit. Then to process the captured images, I'm using a wrapper for openCV called Emgu CV (http://www.emgu.com/) that comes in both 32bit or 64bit flavors as well. Now, being on Vista64 I went for the 64bit versions of FlyCapture (Point Grey's SDK) and Emgu CV (which includes openCV in its install) hoping to maximize performance. Recently I've been wanting to call my FlyCapture+Emgu DLL code from XNA, which unfortunately only exists in 32bit, and I realize that I may have to reinstall all those components in 32bit as I don't really want to go through IPC, remoting, etc. Apart from the obvious limit to memory space inherent to 32bit, is there also a performance loss I should be expecting? How dramatic would that be and why ? Thanks in advance for any advice or explanation.

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  • When is performance gain significant enough to implement that optimization?

    - by Zwei steinen
    Hi, following the text book, I do measure performance whenever I try optimizing my code. Sometimes, however, the performance gain is rather small and I can't decisively decide whether I should implement that optimization. For example, when a fix shortens an average response time of 100ms to 90ms under some conditions, should I implement that fix? What if it shortens 200ms to 190ms? How many condition should I try before I can conclude that it will be beneficial overall? I guess it's not possible to give a straight forward answer to this, as it depends on too many things, but is there a good rule of thumb that I should follow? Are there any guideline/best-practices?

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  • Does the <script> tag position in HTML affects performance of the webpage?

    - by Rahul Joshi
    If the script tag is above or below the body in a HTML page, does it matter for the performance of a website? And what if used in between like this: <body> ..blah..blah.. <script language="JavaScript" src="JS_File_100_KiloBytes"> function f1() { .. some logic reqd. for manipulating contents in a webpage } </script> ... some text here too ... </body> Or is this better?: <script language="JavaScript" src="JS_File_100_KiloBytes"> function f1() { .. some logic reqd. for manipulating contents in a webpage } </script> <body> ..blah..blah.. ..call above functions on some events like onclick,onfocus,etc.. </body> Or this one?: <body> ..blah..blah.. ..call above functions on some events like onclick,onfocus,etc.. <script language="JavaScript" src="JS_File_100_KiloBytes"> function f1() { .. some logic reqd. for manipulating contents in a webpage } </script> </body> Need not tell everything is again in the <html> tag!! How does it affect performance of webpage while loading? Does it really? Which one is the best, either out of these 3 or some other which you know? And one more thing, I googled a bit on this, from which I went here: Best Practices for Speeding Up Your Web Site and it suggests put scripts at the bottom, but traditionally many people put it in <head> tag which is above the <body> tag. I know it's NOT a rule but many prefer it that way. If you don't believe it, just view source of this page! And tell me what's the better style for best performance.

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  • Is there performance to be gained by moving storage allocation local to a member function to its cla

    - by neuviemeporte
    Suppose I have the following C++ class: class Foo { double bar(double sth); }; double Foo::bar(double sth) { double a,b,c,d,e,f a = b = c = d = e = f = 0; /* do stuff with a..f and sth */ } The function bar() will be called millions of times in a loop. Obviously, each time it's called, the variables a..f have to be allocated. Will I gain any performance by making the variables a..f members of the Foo class and just initializing them at the function's point of entry? On the other hand, the values of a..f will be dereferenced through this-, so I'm wondering if it isn't actually a possible performance degradation. Is there any overhead to accessing a value through a pointer? Thanks!

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  • Does it make a difference in performance if I use self.fooBar instead of fooBar?

    - by mystify
    Note: I know exactly what a property is. This question is about performance. Using self.fooBar for READ access seems a waste of time for me. Unnecessary Objective-C messaging is going on. The getters typically simply pass along the ivar, so as long as it's pretty sure there will be no reasonable getter method written, I think it's perfectly fine to bypass this heavy guy. Objective-C messaging is about 20 times slower than direct calls. So if there is some high-performance-high-frequency code with hundreds of properties in use, maybe it does help a lot to avoid unnessessary objective-c messaging? Or am I wasting my time thinking about this?

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  • How do you optimize database performance when providing results for autocomplete/iterative search?

    - by Howiecamp
    Note: In this question I'm using the term "autocomplete" (or "iterative search") to refer to returning search-as-you-type results, e.g. like Google Search gives you. Also my question is not specific to web applications vs. fat client apps. How are SQL SELECT queries normally constructed to provide decent performance for this type of query, especially over arbitrarily large data sets? In the case where the search will only query based on the first n characters (easiest case) am I still issuing a new SELECT result FROM sometable WHERE entry LIKE... on each keypress. Even with various forms of caching this seems like it might result in poor performance. In cases where you want your search string to return results with prefix matches, substring matches, etc. it's an even more difficult problem. Looking at a case of searching a list of contacts, you might return results that match FirstName + LastName, LastName + FirstName, or any other substring.

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  • Why are there performance differences when a SQL function is called from .Net app vs when the same c

    - by Dan Snell
    We are having a problem in our test and dev environments with a function that runs quite slowly at times when called from an .Net Application. When we call this function directly from management studio it works fine. Here are the differences when they are profiled: From the Application: CPU: 906 Reads: 61853 Writes: 0 Duration: 926 From SSMS: CPU: 15 Reads: 11243 Writes: 0 Duration: 31 Now we have determined that when we recompile the function the performance returns to what we are expecting and the performance profile when run from the application matches that of what we get when we run it from SSMS. It will start slowing down again at what appear to random intervals. We have not seen this in prod but they may be in part because everything is recompiled there on a weekly basis. So what might cause this sort of behavior?

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  • How to Audit Database Activity without Performance and Scalability Issues?

    - by GotoError
    I have a need to do auditing all database activity regardless of whether it came from application or someone issuing some sql via other means. So the auditing must be done at the database level. The database in question is Oracle. I looked at doing it via Triggers and also via something called Fine Grained Auditing that Oracle provides. In both cases, we turned on auditing on specific tables and specific columns. However, we found that Performance really sucks when we use either of these methods. Since auditing is an absolute must due to regulations placed around data privacy, I am wondering what is best way to do this without significant performance degradations. If someone has Oracle specific experience with this, it will be helpful but if not just general practices around database activity auditing will be okay as well.

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  • Java - Can i have a faster performance for this loop ?

    - by Brad
    I am reading a book and deleting a number of words from it. My problem is that the process takes long time, and i want to make its performance better(Less time), example : Vector<String> pages = new Vector<String>(); // Contains about 1500 page, each page has about 1000 words. Vector<String> wordsToDelete = new Vector<String>(); // Contains about 50000 words. for( String page: pages ) { String pageInLowCase = page.toLowerCase(); for( String wordToDelete: wordsToDelete ) { if( pageInLowCase.contains( wordToDelete ) ) page = page.replaceAll( "(?i)\\b" + wordToDelete + "\\b" , "" ); } // Do some staff with the final page that does not take much time. } This code takes around 3 minutes to execute. If i skipped the loop of replaceAll(...) i can save more than 2 minutes. So is there a way to do the same loop with a faster performance ?

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  • Ubuntu 10.04 external monitor problem

    - by Ricky
    I've just installed the 10.04 release on my laptop. I've also installed the nvidia propietary driver as suggested by the system. I've some problem using an external monitor, i'm not able to set the correct resolution using the nvidia-setting utiloty. It doesn't recognize the right resolution of my external monitor. Any advice please? :) I'm a newbie.

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  • Eyefinity resolution on third monitor

    - by Sam2299
    I'm now using three monitors with resolution capability of 1920x1080. The one monitor connected to Active Display Port is (from some reason) limited to 1440x900. Is there a way to increase the resolution of the third monitor to have all three at 1920X1080? My machine: Graphics card - AMD 5770 Processor - Intel Core i7-2600 Ram - 8GB OS - Windows 7 64bit. VGC(Video Graphics Controller) driver is up to date. Got this message:

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  • Unable to connect Third monitor to my workstation

    - by Prashant
    I have Dell Optiplex 960 with ATI Radeon HD 3470 graphics card, which allowed me to hook two monitors to it. However there is still VGA port on mother board is unused. I tried plugging another monitor, surprisingly my third monitor doesn't directed. Can any one give me a hint how to fix this problem?

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  • Web traffic/activity monitor

    - by DealingWithAConcernedMom
    Is there a good free monitor that will allow me to monitor my son's internet activity. I'm specifically looking for history of websites visited and time spent on the site. I think that he is visiting sites that his mom would not approve of but is erasing the history etc.

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  • Browser resizing when the monitor turns on/off?

    - by Jason
    The last week or so I have noticed an odd thing. When I turn on my monitor, my browser windows are all half the size they were when I turned it off. Sometimes when I turn it on the taskbar is even half way up the screen for a few moments, as if turning the monitor on and off was forcing it to change the resolution. I use firefox, running windows 7.

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