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SubjectRe: short display with 2.1.132-ac3, matroxfb and XF86_SVGA 3.3.3

On Fri, 1 Jan 1999, Gerd Knorr wrote:

> Linus Torvalds <> writes:
> >On Fri, 1 Jan 1999, Alan Cox wrote:
> >>
> >> You cannot and should not mix XFree86 servers (except the frame buffer
> >> console server) with the kernel frame buffer driver. Period.
> >That's a kernel frame buffer bug as far as I can tell.
> >If the text console can live together with X messing with the display
> >device, there is no reason why the frame buffer console shouldn't do the
> >same. We already have all the code to serialize the accesses.
> In theory it should work fine. In practice some X-Servers have problems
> to restore the video mode correctly. Maybe due to some hardware problem
> (some video boards you can't ask about the current state), maybe becauce
> they don't expect the console being in graphics mode. You'll end up with
> a broken console then. This problem is'nt new...

Please notice that my problem has nothing to do with text mode
restoration; the "clicking" or "jitter" in the sound was audible while
stressing the computer (even slightly -- changing Window Maker workspaces
or text scrolling in an Eterm). There was zero problems changing between
ordinary text consoles and the one XF86_SVGA was running on.

> I never had problems to mix the accelerated XFree86 Server with fbcon
> (matrox mystique, both vesafb and matroxfb work fine). The FBDev Server
> works too, of cource.

Neither did I have problems -- until recently. I'm in the process of
learning how XFree (the svga server) and matroxfb work, but it will
probably take a lot of time before I can contribute to fixing whichever is

Taneli <>

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