[Bug 65963] New: screen goes blank, Linux hangs - Radeon 7870, Gallium, Glamor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=65963

          Priority: medium
            Bug ID: 65963
          Assignee: xorg-driver-ati at lists.x.org
           Summary: screen goes blank, Linux hangs - Radeon 7870, Gallium,
                    Glamor
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: nowaker at geozone.pl
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/Radeon
           Product: xorg

My Linux hangs randomly after I replaced my 2x Nvidia cards (ZaphodHeads,
Xinerama) with Radeon 7870 (Gallium, Glamor). 

Desktop hangs, I can move the pointer but clicking doesn't have any effect.
After ~3 second the screen goes blank. Sometimes (10%?) it recovers after ~15
seconds. In most cases it just hangs. Linux is totally dead, doesn't answer to
ping, ssh and even Alt+PrtSc shortcuts.

If it recovers, I see this[1] in the dmesg and this[2] in the Xorg.0.log.

[1]
[  389.821754] radeon 0000:01:00.0: GPU lockup CP stall for more than 10000msec

[2]
(EE) [mi] EQ overflowing.  Additional events will be discarded until existing
events are processed.


I am able to reproduce the bug using Linphone (it doesn't mean it hangs just in
Linphone). I call my mobile. Screen goes blank right after connection is
established (connection = when you hear beeping and you wait for the guy to
answer the phone). Therefore, I can test if the changes you provide resolve the
issue.


Using x86_64  Arch Linux 3.9.6-1-ARCH, radeon and glamor from git, KDE.

lspci: 01:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
[AMD/ATI] Pitcairn XT [Radeon HD 7870 GHz Edition]

glxinfo: OpenGL renderer string: Gallium 0.4 on AMD PITCAIRN



Full logs:
http://upload.nowaker.net/nwkr/1371723485_glxinfo
http://upload.nowaker.net/nwkr/1371724316_xrandr

When Linux recovers:
http://upload.nowaker.net/nwkr/1371723420_dmesg
http://upload.nowaker.net/nwkr/1371724751_Xorg.0.log

When Linux hangs, thus log cut:
http://upload.nowaker.net/nwkr/1371723428_Xorg.0.log.old - when Linux hangs


Tell me if you need more logs.
I will be happy to test any provided fixes.

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