[Bug 81281] New: 8970M boot problems since 3.13 with dpm

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=81281

            Bug ID: 81281
           Summary: 8970M boot problems since 3.13 with dpm
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16.0-rc5
          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: sharkgoesmad at gmail.com
        Regression: No

Created attachment 144531
  --> https://bugzilla.kernel.org/attachment.cgi?id=144531&action=edit
syslog

I am using MSI GX60 3BE 240US, which is a AMD/AMD hybrid, sporting a10-5750m
Richland apu and super-powerful HD 8970M.

Since kernel 3.13, my laptop is unable to boot unless ran with radeon.dpm=0.
Worth to note that 3.12 with radeon.dpm=1 works mighty fine.

While trying different kernel versions and inspecting syslog, it seems that in
all cases the problem starts with the following line:

[drm:r600_ring_test] *ERROR* radeon: ring 0 test failed
(scratch(0x850C)=0xCAFEDEAD)

In 3.13-3.15 it results in system restart when the login screen shows up. In
3.16 however, the screen freezes and no restart occurs. The system responds
normally when pressing power button and shuts down.

Attached is the piece of the syslog and Xorg.0.log when ran with 3.16-rc5.

Any help would be greatly appreciated. Thanks.

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