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

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Oct 18 06:48:51 PDT 2012


          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
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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