[Bug 66932] New: Screen corruption on Cayman with dpm enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=66932

          Priority: medium
            Bug ID: 66932
          Assignee: dri-devel at lists.freedesktop.org
           Summary: Screen corruption on Cayman with dpm enabled
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: g02maran at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: DRI CVS
         Component: DRM/Radeon
           Product: DRI

Created attachment 82448
  --> https://bugs.freedesktop.org/attachment.cgi?id=82448&action=edit
dmesg

When I enable dpm with my 6950 I see major screen corruption. It works fine
with dpm disabled. 

The computer does not get completely locked up. The screen flickers but there
is always a pattern in the corruption that stays the same. Sometimes, not
always, I can see and control a corrupted mouse cursor. But the screen is so
corrupted that i can't login or do anything. I can ssh into the computer but it
won't reboot.

I first tried 3.11-rc1 but then did my tests on
http://cgit.freedesktop.org/~agd5f/linux/?h=drm-fixes-3.11 with latest commit
being a01c34f72e7cd2624570818f579b5ab464f93de2

I have ucode (downloaded 2013-06-15) from
http://people.freedesktop.org/~agd5f/radeon_ucode/

I compiled the kernel with this.
CONFIG_EXTRA_FIRMWARE="radeon/CAYMAN_mc.bin radeon/CAYMAN_me.bin
radeon/CAYMAN_pfp.bin radeon/CAYMAN_rlc.bin radeon/CAYMAN_smc.bin
radeon/SUMO_uvd.bin"

I did a bisect and found that this commit introduced the corruption:

http://cgit.freedesktop.org/~agd5f/linux/commit/?h=drm-fixes-3.11&id=7ad8d0687bb5030c3328bc7229a3183ce179ab25

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