Problem with xcompmgr on Radeon card

[Vladimir Dergachev]

On Tue, 5 Oct 2004, Francesco wrote:

> I have X.org 6.8.1 with this snapshot driver for radeon:
> http://freedesktop.org/~fxkuehl/snapshots/radeon-20041003-linux.i386.tar.bz2
> Everything works fine including tv-in and dri with 3d acceleration and I get 
> about 1400 fps with glxgears.
>
> The problems start when I run xcompmgr, it works (and glxgears continue to 
> give me high FPS) but X in general is very slow, unusable. I have read of 
> other people in the internet with problems with ati cards and x.org 6.8.1, 
> but here everything works except xcompmgr (same behaviour with metacity patch 
> to enable composition manager).
>
> When I launch X I noticed this line:
> (WW) RADEON(0): Failed to set up write-combining range (0xe0000000,0x4000000)
> I think that can be related with my problem.
>
> Any hint to solve this?

Are you by chance running with vesa framebuffer and 2.6.x kernel ?
There was some posts that seem to imply that vesa fb sets up mttr for
visible part of framebuffer only and this can mess up X.org.

Try using radeon framebuffer driver.

                         best

                            Vladimir Dergachev


> Thanks.
> Frankk
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