matroxfb, anybody? (More details...)

Geert Uytterhoeven geert at
Mon Feb 1 01:36:27 EST 1999

On Sat, 30 Jan 1999, dhiltgen at wrote:
> It appears that the issue is that somehow the kernel is using fb0
> sometimes, and others it's using FRAMEBUFFER, or the "-fb" argument.
> When I try to change settings using fbset it's like both frame buffers
> get set at once, and one of them gets confused since the timings are only
> valid for one of the cards.  ...or, the FB code in the kernel _really_
> isn't very clean when it comes to multiple heads right now, and some
> code just assumes /dev/fb0 is console and uses it without checking for
> the proper state information.  I guess the whole thing is complicated 
> by the fact that sometimes it's user space stuff, other times it's kernel 
> space stuff messing with the fb.

There are known problems with multiheadness. Unfortunately I can't `see' what's
wrong until I get my second video board working. Yes, I'm embarassed by that.



Geert Uytterhoeven                     Geert.Uytterhoeven at
Wavelets, Linux/{m68k~Amiga,PPC~CHRP}
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium

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