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Re: resolving X Server crashes on SPARC (bugs #488669 and #500358)

Gaudenz Steinlin writes:
 > Hi
 > Joss assigned me these two bugs[1] (currently merged) for the bug sprint[2]. As
 > I lack proper SPARC hardware to investigate this myself, I need your help.
 > The two bugs are about X Server Crashes on SPARCs with PCI ATI Mach64 cards. The
 > most probable cause of the crash is an incompatible kernel change introduced with
 > kernel 2.6.26. For #500358 I'm quite sure that it' caused by the kernel change. 
 > For #488669 I'm not quite sure if it's really the same bug, because the original
 > reporter ran kernel 2.6.24 which predates the kernel change. For more information 
 > about the kernel change see: http://marc.info/?t=121247857800001&r=1&w=2
 > If the crash is really caused by the kernel change, the real bug is in the X server.
 > But to fix it, we would have to upgrade to xserver-xorg-core 1.5. I don't think that
 > this is really an option. The other options would be to revert the kernel change or
 > to release with a non-working X server for some SPARC machines. Unless of course we
 > find someone willing and able to fix the X server in lenny to work with the kernel 
 > change. A simple backport of the changes in 1.5 doesn't seem to be possible.
 > I would like you to test two things:
 > 1. Install the kernel package from http://people.debian.org/~gaudenz/sparc
 >    and test if this fixes the problem. This is the same kernel as currently 
 >    in unstable with the problematic change removed. Please also test this 
 >    kernel if you are not affected by the change to see if the removal of the 
 >    problematic change has any ill side effects.
 > 2. Install xserver-xorg-core and xserver-xorg-video-mach64 from experimental
 >    and run this on a kernel 2.6.26 or later without removing the change. This 
 >    should also fix the problem.

I'm the one who started the kernel thread mentioned above. I run Aurora
not Debian on my Ultra5 so I can't really test your Debian packages. However,
I have been using a private forward-port of a patch to revert the problematic
SPARC kernel change in the 2.6.26 and 2.6.27 kernels, and at least for me
reverting the change fixes the X server but hasn't caused any ill effects.


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