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My screen frequently doesn't refresh correctly and white rectangles remain. What can I do?

My graphics adapter is 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

(printed by lspci)

I am using Ubuntu 11.04 in the Classic session, with no effects.

[UPDATE] Natty uses Intel video driver version 2.14. I downloaded the sources for the Oneiric version, which is 2.15, from packages.ubuntu.com. Compiled the kernel module and installed it using make install. I copied the file *intel_drv.so*, which was located in a directory inside /usr/local/lib, to the corresponding /usr/lib directory and renamed the existing *intel_drv.so* file. Xorg.0.log now shows driver version 2.15, but the problem still occurs. Maybe I made a mistake or missed something?

Here are two screenshots that illustrate the bug at 1366x768 and 1024x768:

enter image description here

enter image description here

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What's happening if you mouse over those rectangles? Can you try to disable Unity (if you're running 11.04 or later of course). –  bakytn Aug 1 '11 at 17:40
    
Hi bakytn, I am running 11.04/Natty. I am working with the classic Ubuntu interface now. Same problem here. If I move the mouse over the rectangles, they sometimes disappear (inside menus in Eclipse for instance), others don't. The xrefresh command makes them disappear sometimes too, but not always. They happen quite often and are quite annoying. –  user22611 Aug 1 '11 at 22:19
    
do they disappear if you use "classic with no effects"? if it works its a compiz issue. It would be useful to know what your graphics card is (add it to your question) - and if you have any graphics drivers installed. –  fossfreedom Aug 1 '11 at 22:31
    
I am using "classic with no effects". I'm sure it isn't a compiz issue. I added my graphics card to my question (lspci output). I don't think I have a graphics driver installed, at least I didn't install it myself. –  user22611 Aug 1 '11 at 23:06
    
What is your screen resolution? –  Thomas Boxley Aug 1 '11 at 23:25
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closed as too localized by fossfreedom May 1 '12 at 13:25

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