[Bug 84744] New: [sna] X-Server freeze when playing a video using VA-API in dual-head configuration

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84744

            Bug ID: 84744
           Summary: [sna] X-Server freeze when playing a video using
                    VA-API in dual-head configuration
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: gentoo at gishpuppy.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 107471
  --> https://bugs.freedesktop.org/attachment.cgi?id=107471&action=edit
xorg.conf

I have an Intel Celeron G1840 running on an ASUS H87M-PRO motherboard. I have
connected a monitor using DisplayPort and my TV using HDMI to the PC and have
configured them as two separate screens (see xorg.conf).
When I play a video using VA-API (mpv --hwdec=vaapi -vo=vaapi video.mp4) the
X-Server freezes after the first frame (or maybe some more) and it is only
possible to kill the X-Server via SSH. There is no error logged in
/sys/kernel/debug/dri/0/i915_error_state.
Sometimes the video plays fine (about 1 in 10-20 times). However, after some
seeking forward/back the X-Server also freezes.

The freeze happens with xf86-video-intel-2.99.916 and the latest Git checkout.
I also tested some older releases.
I am using xorg-server-1.15.0, mesa-10.0.4 and libdrm-2.4.52, but also tried
the latest ~amd64 versions which Gentoo provides.
I am currently using libva 1.4.1.pre1 (1.3.2-70-g57c86a4), but also tested the
releases 1.3.0 and 1.3.2.
The problem occurs with kernel 3.14.14-gentoo and linux-3.16.3-gentoo.

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