[Bug 37169] [r280] GL applications crash X (KMS in Ubuntu 11.04)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37169

--- Comment #6 from Vlado Plaga <rechner at vlado-do.de> 2011-07-24 10:55:20 PDT ---
Now with Linux 3.0 (and the little fix from
https://bugzilla.kernel.org/show_bug.cgi?id=23222 ) I get working 3D
acceleration... working, but not very usable. I'm now loading the radeon module
with "radeon.modeset=1 radeon.agpmode=-1" (no more "no_wb=1").

GL programs like the queens screensaver work again, but, probably due to my
wide screen (1920 px), they are quite slow in full screen mode. Same goes for
glxgears. I had the latter running for a few seconds with "agpmode=2", and it
seemed faster, but then the whole system crashed again. So I don't know if this
bug should be marked as closed/ resolved now.

Unfortunately "xv" for video playback isn't as good as it used to be with UMS:
videos with somewhat higher resolution (like DVD), or stretching a
low-resolution video's window to about 600 px width, cause an interesting
"stutter" effect (even apparently going backwards a litte) although CPU usage
is not at 100% yet.

It is possible to run the Gnome desktop with "desktop effects" (transparent
terminal, window shadows) enabled. Under KDE (which I prefer) this first seems
to work as well (with compositing type XRender, not with OpenGL), but several
times situations occured where xorg (and once kded) caused 100% cpu usage.

I'd still like to see working 3D on my old Mac mini, but probably I'll buy some
AMD Fusion system as a replacement in the coming months anyway. There are just
too many problems, and some programs are really quite slow on this old machine.

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