[Bug 88911] New: Radeon: Patch "drm/radeon: fix speaker allocation setup" causes kernel lockup

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=88911

            Bug ID: 88911
           Summary: Radeon: Patch "drm/radeon: fix speaker allocation
                    setup" causes kernel lockup
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.17.3
          Hardware: All
                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: klaus.kusche at computerix.info
        Regression: No

Since 3.17.3, my system (Dell precision M 6700 notebook with AMD Cap Verde
graphics) locks up hard as soon as I connect a beamer via HDMI
(both when connected to the HDMI output and when connected to the DP output
via a DP/HDMI adapter) while X is running or before starting X
(console mode only is fine). 3.17.2 worked.

With good luck, the system is still alive, but keyboard, display and mouse
are locked up, because X hangs. The system shuts down on soft power off,
but with 10 seconds delay and the filesystems still mounted: 
X seems to be unkillable.

With bad luck, the fan goes to 100 % and the kernel seems to be dead:
Zero disk activity, hard power off is the only way out.

The faulty patch is "drm/radeon: fix speaker allocation setup":
Applying or reverting this patch only makes the difference.

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