Bug#420300: Workaround found, but no solution for the bug

[Moritz Muehlenhoff <jmm@inutil.org>]

On Wed, May 09, 2007 at 01:59:37AM +0200, Hans-Joachim Zierke wrote:
> 
> Several attempts were undertaken, to solve the problem with different
> video modes, especially modes very close to each other. No success.
> 
> 
> Several kernel attributes for the framebuffer were tried, like 
> init - noinit etc. No success.
> 
> 
> Different settings for the X-Server were tried. Of these, setting
>         Option          "UseFBDev"              "true"
> has shown an effect: Instead of a system crash after every ~20th switch
> or so, the system crashed for every ~2nd switching.
> 
> 
> Workaround for the problem is the following: Don't use the MGA driver 
> for the X-Server. Instead, use the framebuffer driver for the X-Server.
> After doing so, the system didn't crash for several days, which is only
> a preliminary result, but already a phantastic one.
> (I haven't seen such unreliable system since the days of DOS cache 
> programs playing with the A20 gate.)
> 
> 
> I'm not sure, which MGA driver is at fault: fb or xorg.

Did you upgrade to Lenny in the mean time? If so, does the error
persist?

Cheers,
        Moritz