[Bug 96847] New: TearFree breaks when playing back videos in Firefox with GPU accelerated windows enabled in Firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96847

            Bug ID: 96847
           Summary: TearFree breaks when playing back videos in Firefox
                    with GPU accelerated windows enabled in Firefox
           Product: xorg
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: nw9165-3201 at yahoo.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hi,

running Xubuntu 16.04 on a Core i7-6700K here.

There's a lot of tearing by default. But when setting up the following xorg
conf file:

/etc/X11/xorg.conf.d/20-intel.conf

with the following contents:

Section "Device"
 Identifier "Intel Graphics"
 Driver     "intel"
 Option     "AccelMethod" "sna"
 Option     "DRI" "3"
 Option     "SwapbuffersWait" "true"
 Option     "TripleBuffer" "true"
 Option     "TearFree" "true"
EndSection

the tearing is gone.

TearFree is working fine.

But when enabling GPU accelerated windows in Firefox 47 via setting
"layers.acceleration.force-enabled" to "true" in about:config
(https://bugzilla.mozilla.org/show_bug.cgi?id=594876), and then watching a
video on YouTube for example, TearFree suddenly seems to break after a short
amount of time.

There suddenly is tearing again when moving windows around for example.

The tearing also does not go away when closing Firefox.

After rebooting, TearFree is working again (until playing back a video in
Firefox again).

Any chance you could fix that?

Regards

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