Hello,

when I switch to vt while there is much drawing on the X Server (like KDE 
start) the X Server crashes after 1-2 seconds with SEGV. 
My setup: Linux 2.4.17, debian testing
XFree86 Version 4.1.0.1 (no option to fbdev, the same resolution and color 
depth as set with fbset)
The problem is the same, if I only use the first head.
Hardware: Matrox G450, Athlon SMP
I don't have the problem, if I use the mga X driver on top of matroxfb, 
instead of using the fbdev on top of matroxfb. But  then there is a strange 
flickering when the X Server starts, so I prefer the fbdev driver. 

You probably need more information, but I'm not sure what else I could write 
about this problem. Please let me know what else you need.

I first wrote to Petr (the matroxfb mantainer) he wrote me the following:
> I have no idea why it should die, on Gxxx neither video memory start
> nor length changes on mode switch (it changes on MillenniumI/II), and
> matroxfb does not steal framebuffer mapping from any app on console switch
> (there are some plans to do that on 2.5.x, but as I disagree with these
> plans...), only X itself unmap framebuffer itself.

> So I think that it is fbdev problem - if you are getting kernel oops,
> it is for sure matroxfb's problem, but if you are not getting them, it
> looks to me like that fbdev driver tries to paint to screen even if
> it is not visible (btw, mga-dri has same problem, it changes accelerator
> color depth/screen width/height even if X are in background).

regards,

Roland Schulz
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