[945GM] dual screen crash with total resolution bigger than 2048x2048

[Krzysztof Matusik]

Binary package hint: xserver-xorg-video-intel

Inside GNOME (the same happens for Unity) when I try to put screens aside in monitor config, when one screen is bigger than 1024x768 (for ex. 1440x900) graphics keeps crashing and configuration reverts to previous settings. When I put a 1440x900 screen below or above 1024x768 screen this problem doesn't exists.
One screen is laptop, other is plugged LCD monitor (max 1440x900).

[Bryce Harrington (bryce)]

[By 'xinerama' I think you mean 'xrandr'... xinerama is no longer used on intel for dual head configuration]

[Bryce Harrington (bryce)]

Please collect a full backtrace - see http://wiki.ubuntu.com/X/Backtracing for directions.

Does this happen only when you have compiz (aka Visual Effects) turned on? This sounds similar to a bug we saw reported a lot for 945 where X would crash because the i945 is limited to a 2048x2048 texture buffer.

Also, if possible it would be helpful if you could test this against natty, in case the issue is already fixed.

[Krzysztof Matusik (krzysztof-matusik)]

Hi Bryce

I'll answer your questions as soon as I find some time to do that.

[Krzysztof Matusik (krzysztof-matusik)]

Hello again

Tested. When I use compiz without "visual effects" problem doesn't exist.
I had mutter enabled when the problem was happening, well... I think mutter _is_ using some compositing or whatever... I've installed compiz-icon to enable compiz with it. Unfortunately I can't enable those "visual effects" right now- with or without dual-head. Any attempt makes windows loose it's decoration and then things fall back to previous settings. I must say that "the 2048x2048 problem" was looking quite similar- the X didn't crashed totally, only windows kept flickering, without its decorations, and then after a while it felt back to previous settings.
I've installed intel drivers from natty; no difference (although it seems graphics are working a bit faster :-).

Let me know if there's anything else I should try.

regards

[bugbot (bugbot)]

We're closing this bug since it is has been some time with no response from the original reporter. However, if the issue still exists please feel free to reopen with the requested information. Also, if you could, please test against the latest development version of Ubuntu, since this confirms the bug is one we may be able to pass upstream for help.