Bug#645547: [i915] intermittent memory corruption after hibernation unless i915.modeset=0

[Kjö Hansi Glaz <kjo@a4nancy.net.eu.org>]

On Fri, Mar 30, 2012 at 12:44:52PM -0500, Jonathan Nieder wrote:
> tags 645547 + upstream patch
> quit
> 
> Kjö Hansi Glaz wrote:
> 
> > I tried appending `i915.modeset=0` and thus falling back to vesa makes
> > hibremation/resume working.
> >
> > I also tested 3.2.0-rc4 from experimetal (with modesetting enabled) and
> > experience the same kind of problems that with 3.1.0. Sometimes
> > processes segfault, sometimes the whole kernel hangs.
> 
> Thanks again for tracking this down.  Please test the attached patch
> against a 3.2.y kernel, such as the one from sid. 

>From my experience of a dozen of hibernate/resume cycles, this patch works.

Thanks for following this bug!