The following may help from this page
http://gentoo-wiki.com/HOWTO_XGL/Troubleshooting#no_screens_found
On my Radeon Mobility 9000 (R250 lf) M9 running radeon drivers (mesa/drm
cvs) I had to enable large texture support (r200) with driconf. Doing
this and/or running at a lower resolution may solve this problem.
A modified (or newly created) /etc/drirc could looks like this:
<driconf>
<device screen="0" driver="r200">
<application name="all">
<option name="allow_large_textures" value="2" />
</application>
</device>
</driconf>
I had a laptop with a R250 and the screen width was wider than the largest texture supported (1024x1024) and turiing this one let it use the 1440x1050 screen.
Regards,
Paul
On Wed, 2007-07-04 at 11:22 +0200, ArcosCom Linux User wrote:
> I have a Radeon X600.
>
> I don't stand fine how I can change that "things" you said. Could you
> explain a bit how can I change that parameters? What configuration files /
> programs must I change/run? How?
>
> As I said, I have no knowledge about Xorg graphics architecture or any
> graphics related parameters.
>
> I can change any xorg parameter, or any configuration file using your help
> (or any link that anybody post here). But I think, at this point, my
> xorg.conf is well configured (thanks to the xorg buys for their help) and
> must be any other configuration file or perhaps I must think in wait for a
> new beryl release or a new driver release. I don't know yet.
>
> Thanks
>
> El Mie, 4 de Julio de 2007, 11:04, Roland Scheidegger escribió:
> > ArcosCom Linux User wrote:
> >> As some e-mails ago, I'm trying to play beryl in my laptop.
> >>
> >> I successfully configured my xorg.conf (thanks to the comunity for the
> >> help that allowed me that).
> >>
> >> The problem:
> >>
> >> When I boot the laptop without external LCD/CRT, beryl is working fine,
> >> but when I boot it with the external, it recognice fine the external LCD
> >> and don't want to allow beryl run.
> >>
> >> What beryl says:
> >> Checking maximum texture size : failed
> >>
> >> Root window size (2960/1050) is bigger then maximum texture size
> >> (2048x2048)
> >> Searching the web I readed that with "driconf" util I can try to solve
> >> the
> >> problem. I had installed driconf 0.9.1 successfully, but I don't know
> >> how
> >> to change that parameters.
> >>
> >> Does anyone used driconf or knows how can I solve this problem with
> >> beryl/compiz?
> > Radeons have a texture size limit of 2048x2048 (well pre-r500 radeons),
> > so there is not much you can do. The driconf setting you're refering to
> > was to allow larger textures which might not fit into video memory under
> > some circumstances, but this is the default now and it won't allow
> > larger than 2048x2048 anyway (btw software mesa may have the same limit,
> > but obviously this is not really set in stone).
> > compiz/beryl may work around this by breaking the too large textures up
> > into smaller ones, though I'm not sure if there's work going on in that
> > direction. It won't be very efficient, neither.
> > If you have a pre-r300 radeon, you would hit the 3d coordinate limit too
> > (2048 too), which would need to be solved at the driver level.
> >
> > Roland
> >
>
>
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