Bug#523467: xserver-xorg-video-radeon: Slowness

[Michel Dänzer]

On Sat, 2009-04-18 at 23:58 +0200, Torquil Macdonald Sørensen wrote: 
> Package: xserver-xorg-video-radeon
> Version: 1:6.12.2-1
> Severity: normal
> 
> I may have the same problem, but I have not tried linux 2.6.30 since it is not in
> Debian. Things are wuite slow now, e.g. only 100FPS with glxgears, compared to a few
> thousand before.
> 
> After the upgrade, OpenGL support disappeared. I upgrade the newest kernel available
> in Debian, which was 2.6.29, but it didn't help. Then I checked Xorg.0.log, which
> complained about XAA, and said to change to EXA, which I did. After that I got OpenGL
> support back, but it is really slow.
> 
> There is a strange message at the next to last line in Xorg.0.log:
> exaCopyDirty: Pending damage region empty!

That's harmless and definitely not related to your problem.


> Section "Device"
> 	Identifier "Device0"
> 	Driver "radeon"
> 	Option "AccelMethod" "EXA"
> 	Option "BackingStore" "true"

Does disabling this option help?

> 	Option "ColorTiling" "true"
> 	Option "EnablePageFlip" "true"
> 	Option "AGPMode" "4"
> 	Option "GARTSize" "128"
> 	Option "Monitor-LVDS" "Monitor0"
> EndSection


> (II) RADEON(0): [drm] removed 1 reserved context for kernel
> (II) RADEON(0): [drm] unmapping 8192 bytes of SAREA 0xf8068000 at 0xb78ff000
> (II) RADEON(0): [drm] Closed DRM master.
> (WW) RADEON(0): Direct rendering disabled

Thought this looks like the most likely cause - the DRI is disabled for
some reason. Is there something agp/drm related in the kernel output?


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer