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[gene <593463@xxxxxxxxxxxxxxxxxx>]

 I recently built 2.6.37-rc3 from the kernel.org with Mike Galbraith's patch being applied to it.  It looks stable so far. Besides seeming keyboard lock-ups shortly after getting to the gdm login window. The "lock-up"  lasted for a few seconds and did not come back. The bug was still present for  2.6.35.4, which I tested  for quite a while and the issues in question occurred only once. 
The following work-around is shaping up:
1) gnome-power-manager should be turned off and "xset dpms 300 300 300" setting should be used for the Xsession instead.
2) if a buggy application (such as npviewer, the adobe flash player wrapper) uses i915, one should issue  
the command "xset dpms 0 0 0" to disable display sleep.

The only occasion when dri/drm was dropped by the kernel was on 2.6.35.4
when the infamous Adobe flashplayer played a video. Apparently
flasplayer does not care about the display sleep option. It also uses
way too much CPU time.

As far as 2.6.37-rc3 is concerned, it might've been  improved. Since
when a video was played by the Adobe flashplayer (with gnome power
manager on) the dsplay went to sleep and could not be returned by any
means, other than "SysReq+K" magic keys.  The kernel did NOT drop
dri/drm capabilities  this time !

-- 
[i945g] xsession crash and consecutive loss of dri/drm capability on i915
https://bugs.launchpad.net/bugs/593463
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