SiS, DRI and DRM

Ian Romanick idr at
Thu Aug 31 13:32:43 PDT 2006

Hash: SHA1

Vicente Helano wrote:
> Hi All,
>  I am having problems with a sis300 agp graphics card.
>  I compiled kernel 2.6.17 with Direct Rendering Manager (DRM) support
> for sis300/305 graphics cards. When the X server (X11R6.8.2) is started
> the DRI and DRM modules are correctly loaded. However, my OpenGL
> applications get wrong rendering (object surfaces seem to have wrong
> normals).
>  If the kernel is compiled without DRM support, everything seems ok. But
> now, looking at Xorg.0.log I found an error message telling that DRM
> module was not found.
> What is going wrong?

When there is no DRM support, 3D falls back to using the software patch.
 I'm sure you also notice in that case that it's *much* slower.

As for problems with the SiS driver, I don't think it has gotten any
support in a long time.  Do you see errors in all applications (e.g.,
glxgears), or just some?  Could you post a link to a screen shot?  Could
you also post the output of glxinfo?

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