Suspend/resume with i915.

[Lars Engels]

On Fri, Jan 30, 2015 at 11:12:48PM +0100, Edward Tomasz Napierała wrote:
> On 0123T1040, Konstantin Belousov wrote:
> > On Thu, Jan 22, 2015 at 12:02:01PM +0100, Edward Tomasz Napiera??a wrote:
> > > I'm trying to fix resume on my T61, broken by some change several
> > > months ago; according to pciconf it's 'Mobile GM965/GL960 Integrated
> > > Graphics Controller (primary)'.  It's running current CURRENT and
> > > up to date packages.
> > > 
> > > Suspend and resume makes Xorg do something weird - there is screen
> > > corruption, or rather window corruption.  The GNOME 3 desktop looks
> > > pretty normal, except that gnome-terminal (launched before suspend)
> > > window looks as if the buffer layout changed underneath it; for example,
> > > instead of one flashing cursor there are several, horizontally, across
> > > the window.  New windows are simply black.  No segv.
> > > 
> > > Setting kern.vt.suspendswitch=0 makes the behaviour disappear, replaced
> > > by segmentation faults of gnome-shell.  With stock gdb it looks like this:
> > 
> > At least one big known issue with suspend is that userspace activity
> > is not stopped, which makes the driver suspend code operating on the
> > non-steady state of devices.
> > 
> > I committed the facility to stop userspace before suspend, and avg promised
> > to integrate this into suspend path, but he did not.  You might try to
> > search mailing lists for reference to his earlier patch.
> 
> Unfortunately stuff was committed before I could test it.  Fortunately,
> it's all fixed now, and works perfectly, on 11-CURRENT.  Thanks!  :-)

I can add that suspend/resume now works reliable again on my X230.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 603 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-current/attachments/20150201/1945a0a7/attachment.sig>