[Bug 99321] Videoplaying applications hangs on latest r600

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=99321

            Bug ID: 99321
           Summary: Videoplaying applications hangs on latest r600
           Product: Mesa
           Version: 13.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: krnlbg@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org

Hello.

After updating to Fedora 25 applications that play videos started to hang
periodically. Firefox, Chrome, Steam and mpv are affected when play video. Also
I found that this can happen in 2d native games like Crimsonland. 3D games
works just fine.
I can't find any logs related to this problem and the only manifestation of
this is that the process goes into "futex_wait_queue_me" status and can only be
killed.

One thing I noticed: starting mpv with --vo=x11 solves the problem. (default is
--vo=opengl). It is 100% reproducible for me. 

I think the problem is driver related because I tried putting my ssd into
another pc with Intel graphics and everything was working just fine.

More info in redhat bugzilla:
https://bugzilla.redhat.com/show_bug.cgi?id=1401479

I don't know how to get more information but i'm willing to try if somebody
suggests me.

My Hardware: 
AMD Phenom(tm) II X4 975 Processor
AMD Radeon 6850 GPU with r600g driver

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