[Bug 56139] New: [bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=56139

          Priority: medium
            Bug ID: 56139
          Assignee: dri-devel at lists.freedesktop.org
           Summary: [bisected] kernel 3.7.0-rc1 breaks 6950 (CAYMAN)
          Severity: major
    Classification: Unclassified
                OS: All
          Reporter: alexandre.f.demers at gmail.com
          Hardware: All
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Radeon
           Product: DRI

Using ArchLinux 64, own built kernel (vanilla) with an HD 6950 (CAYMAN).

When testing kernel 3.7-rc1, the screen becomes unreadable. It's either
completely black or in a flickering state making the display unusable. It is
very similar to what was observed in bug 43655.

At the time of bug 43655, the problem had been fixed by
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=81ee8fb6b52ec69eeed37fe7943446af1dccecc5.
So it was working OK with kernel 3.6.

I've bisected between kernel 3.6 and 3.7-rc1 and the faulty identified commit
is the following:
62444b7462a2b98bc78d68736c03a7c4e66ba7e2 is the first bad commit
commit 62444b7462a2b98bc78d68736c03a7c4e66ba7e2
Author: Alex Deucher <alexander.deucher at amd.com>
Date:   Wed Aug 15 17:18:42 2012 -0400

    drm/radeon: properly handle mc_stop/mc_resume on evergreen+ (v2)

    - Stop the displays from accessing the FB
    - Block CPU access
    - Turn off MC client access

    This should fix issues some users have seen, especially
    with UEFI, when changing the MC FB location that result
    in hangs or display corruption.

    v2: fix crtc enabled check noticed by Luca Tettamanti

    Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

:040000 040000 3e0d33c9b4eda29ced814fe9a863efe63e53f14c
4932561607b160734ec1eade927a9fe18c9f3f1b M    drivers

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