Xorg 7.5 freezes after Linux kernel upgrade

[Jeremy Henty]

On Wed, Nov 24, 2010 at 11:39:18AM -0500, Alex Deucher wrote:
> On Wed, Nov 24, 2010 at 11:02 AM, Jeremy Henty <onepoint at starurchin.org> wrote:
> >
> > I am currently  happily running Xorg 7.5 on  Linux kernel 2.6.35.8
> > .   If I  upgrade  the  kernel to  2.6.36  the  screen  goes black
> >  (even  with the  -retro  argument)    and   the  system   locks  
> > up.      Ctrl-Alt-F<n>    and  Ctrl-Alt-Del    do    nothing,  but
> >  Alt-SysRq-r  followed by  Ctrl-Alt-Del reboots cleanly.
> Do you have kms enabled in your kernel config?

On both my current kernel and the new one, grepping the config for KMS
gives:

CONFIG_DRM_KMS_HELPER=y
# CONFIG_DRM_RADEON_KMS is not set

Does that  make sense?  I generated  the new kernel  config with "make
oldconfig" and  chose default options everywhere  (except for enabling
some of the new netfilter/iptables targets).

> Try booting with radeon.modeset=0 on the kernel command line

No change, I'm afraid; same result, identical X server logs.

> or make sure the radeon drm is loaded before starting X.

My kernel in non-modular so I think that's not an issue.

Thanks for your help,

Jeremy Henty