Red Hat Bugzilla – Bug 444129
3D desktop support broken at higher resolutions
Last modified: 2009-01-09 02:47:39 EST
Description of problem:
I have a laptop with a Radion RV250 (Mobility FireGL 9000). With the latest
xorg-x11-drv-ati driver, compiz effects are limits to a horizontal resolution of
1024 pixels, anything over this is scrambled.
Version-Release number of selected component (if applicable):
3D support works with Ubuntu 7.x and the latest Knoppix distribution.
Created attachment 303764 [details]
This is a actual screenshot with 1400x1050.
If you switch off desktop effects, and then run
gconftool-2 --type bool --set /apps/metacity/general/compositing_manager true
could you still reproduce the bug?
Sorry, scrap the previous comment. It doesn't apply to Fedora 8. Please attach
instead your X server config file (/etc/X11/xorg.conf) and X server log file
(/var/log/Xorg.*.log) to the bug report as individual uncompressed file
attachments using the bugzilla file attachment link below.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and
let X11 autodetect your display and video card? Attach to this bug
/var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 303793 [details]
Created attachment 303795 [details]
The bug only occurs when compiz is enabled, if I disable 3D desktop support, it
works like a charm in all resolutions!
OK, it look's like a colour depth issue: it works in 16bit, but not in 24bit.
It's actually a memory issue.
The maximum texture size reported by OpenGL is the largest power-of-two size at
which, if you load one texture of that size in each texture image unit, they'll
still all fit. This often ends up being smaller than your root window's size.
Since compiz works by binding pixmaps to textures, the biggest thing it can use
as a texture is only 1024x1024 for you, in 32bpp. In 16bpp you use half as much
memory for textures and front/back/depth buffers, so it works fine.
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