[Bug 39897] Graphical glitches in some games on Evergreen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=39897

--- Comment #16 from chrisdhaag at googlemail.com 2011-09-25 10:36:44 PDT ---
Created an attachment (id=51591)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=51591)
xonotic 1600x900, glsl enabled

I have seen the same behaviour in some 3d programs and I also have to add some
information.
mobile HD 6550 = HD 5650
xorg 1.10 and later 1.11, did not make a difference
mesa git
libdrm git
xf86-video-ati git

- The corruption consistently only happens in certain window width/heights.
1600x900 seem to always be bad, while on 1152x768 it works well.
- Deactivating compositing has no effect.
- It happens in 32 bit wine programs as well as in 64 bit programs on a 64 bit
Archlinux (I don't get what that ubuntu discussion is about)

I have seen this in:
- xonotic 0.5 with GLSL enabled. Without GLSL it renders (mostly) fine on
1600x900. So I suspect the problem there.
- Portal 2 in wine. But strangely Half Life 2 Episode 1 worked well.
- Trackmania Nations in wine
- An Ubuntu 11.10 beta VM in Virtualbox with the guest additions enabled
- mplayer with g3dvl vdpau. The rendering is not working right anyway, but when
making the window too big I see the same stripes on the broken rendering

Reducing the resolution in xonotic and trackmania nations helps and resizing
windows in the VM also helps.

So I am not entirely sure whether I have this bug here.

I'll also attach a screenshot of the ubuntu 11.10 vm as it looks strange to me
that a window with a "bad" size in a composited desktop inside virtualbox would
trigger that bug.

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