intel driver suspend/resume failure

[James Bottomley]

On Fri, 2007-06-08 at 16:32 -0500, James Bottomley wrote:
> On Fri, 2007-06-08 at 13:29 -0700, Keith Packard wrote:
> > On Fri, 2007-06-08 at 12:25 -0500, James Bottomley wrote:
> > 
> > > The symptoms are that the X server always crashes on resume (log
> > > attached).  I've tried the various quirk options to pm-suspend but
> > > nothing seems to work.
> > 
> > As usual, the BIOS leaves the chip in a random state on resume, and the
> > driver isn't going through and carefully resetting everything.
> > 
> > Can you try using 'vbetool post' between the resume and the switch back
> > to X to see if that makes it work?
> 
> Afraid not.  Using a manual version of this (suspending from a vt,
> issuing the post and switching back to X) causes the X server to crash
> as soon as it is switched to.
> 
> Just to try a more cautious test, suspending with X not running, then
> resuming, then doing vbetool post then starting X also crashes.  
> 
> Curiously enough, If I just start X and no clients at all, it comes up
> with the X cursor and I can move the mouse.  As soon as I connect a
> client like an Xterm, it crashes.

Actually, I now have the script that allows me to suspend and resume
with X: it's this (X is running on vt 7):

[root at mulgrave ~]# chvt 12
[root at mulgrave ~]# cat /proc/bus/pci/00/02.0 > /var/run/video.state.o
[root at mulgrave ~]# cat /proc/bus/pci/00/02.1 > /var/run/video.state.1
[root at mulgrave ~]# echo mem > /sys/power/state 
[root at mulgrave ~]# cat /var/run/video.state.1 > /proc/bus/pci/00/02.1
[root at mulgrave ~]# cat /var/run/video.state.o > /proc/bus/pci/00/02.0
[root at mulgrave ~]# chvt 7

I'll update my previous scripts: they were only saving one function of
the PCI state of the i915 instead of both functions.

James