[Bug 90621] New: Graphics card locks up fom time to time (*ERROR* radeon: ring 0 test failed (scratch(0x8504)=0xCAFEDEAD))

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90621

            Bug ID: 90621
           Summary: Graphics card locks up fom time to time (*ERROR*
                    radeon: ring 0 test failed
                    (scratch(0x8504)=0xCAFEDEAD))
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: andros at all-ein.net
        Regression: No

Created attachment 162311
  --> https://bugzilla.kernel.org/attachment.cgi?id=162311&action=edit
last message in log

The System is locking up, not even magic keys work only hard reset. Not often
maybe 2 times a week. 

Screen blackens for a second than gets back again but everything is frozen.

I NEVER do Resume or Hibernation or Standby. So this happens occasionally. 

If you search can find some others who have the same problem starting with 3.17
https://www.google.de/search?q=radeon++fence+driver+on+ring+5+use+gpu+addr++and+cpu+addr++%5Bdrm%3Ar600_ring_test%5D+*ERROR*+radeon%3A+ring+0+test+failed+%28scratch%280x8504%29%3D0xCAFEDEAD%29+

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