[Intel-gfx] black screen if sna & TearFree

[Chris Wilson]

On Wed, 15 Aug 2012 08:09:47 -0700, Grant <emailgrant at gmail.com> wrote:
> > I'm using a Dell XPS 13 laptop on Gentoo and if I use:
> >
> > Option "AccelMethod" "sna"
> > Option "TearFree" "true"
> >
> > my video tearing problem disappears, but if I close my laptop lid for
> > a few minutes, it comes back up with a black screen, although I can
> > get my session back if I switch to VT1 and then back to VT7.  I can't
> > find anything in the logs.  I've tried xf86-video-intel-2.20.3 as well
> > as the latest from git.  The problem doesn't occur without the above
> > two directives.
> >
> > Does anyone know how to diagnose or fix this?
> >
> > - Grant
> 
> I can prevent this if I issue 'xset -dpms' before closing the laptop
> lid, but xlockmore automatically re-enables dpms unfortunately.  BTW,
> this does not prevent the problem:

The implication would seem to be that an action during dpms is going
wrong. Does a simple 'xset dpms force off; sleep 1; xset dpms force on'
trigger the error? If so can you please attach your Xorg.0.log and if
you could compile with --enable-debug=full and send me the log
reproducing the error that would be very helpful.

Thanks,
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre