[Bug 91294] [R7 370] DPM and power profile change crash the system

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91294

            Bug ID: 91294
           Summary: [R7 370] DPM and power profile change crash the system
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Radeon
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: elia.argentieri at openmailbox.org

Created attachment 117032
  --> https://bugs.freedesktop.org/attachment.cgi?id=117032&action=edit
dmesg | grep radeon with radeon.dpm=0

My system is unable to boot with an MSI R7 370 Armor 2X unless I put
radeon.dpm=0 (or nomodeset) to the boot parameter.

Also any change to the power profile results in an immediate lock up with blank
screen or, sometimes, black and white vertical stripes.

I think my issue is related with #77394 and #76490. Probably wrong frequency or
voltages given that the MSI R7 370 Gaming 4G (which is the better version with
higher frequency) works with DPM
(http://www.phoronix.com/scan.php?page=article&item=linux-411-gallium&num=1)

Tested with Linux 3.16, 4.0 and 4.1.

lspci -nnk | grep VGA:
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc.
[AMD/ATI] Curacao PRO [Radeon R7 370 / R9 270/370 OEM] [1002:6811] (rev 81)

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