[Bug 75711] New: Radeon: GPU recovery is unable to recover from GPU lockups (R9 270 - error in VDPAU).

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=75711

            Bug ID: 75711
           Summary: Radeon: GPU recovery is unable to recover from GPU
                    lockups (R9 270 - error in VDPAU).
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.15-rc4
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: t3st3r at mail.ru
        Regression: No

Created attachment 135361
  --> https://bugzilla.kernel.org/attachment.cgi?id=135361&action=edit
Failed GPU recovery - R9 270, VDPAU.

There are some cases when Radeon GPUs can lock up on some MESA errors and so
on. While it MESA bugs and somesuch, there is what I believe to be kernel side
bug as well. 

Kernel side problem is how kernel handles GPU recovery procedure. Right now GPU
recovery would fail most of time on virtually any MESA bug and any GPUs, system
would be left in completely unusable state due to lack of graphic output. 

This bug has been caught on 3.15-rc4 kernel running with recent MESA (oibaf PPA
on Ubuntu 14.04). GPU deadlock on R9 270 occured during VDPAU usage. As usually
;) GPU recovery failed to recover this GPU as well.

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