[Bug 60791] Display corruption with Radeon driver during boot and on desktop

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https://bugzilla.kernel.org/show_bug.cgi?id=60791

--- Comment #12 from Brian Hall <hallbw@gmail.com> ---
Bisect results below. According to my Xorg.0.log, my board is a 
"ATI Radeon HD 4200" (ChipID = 0x9710) and lspci calls it a RS880.

6f8bbaf568c7f2c497558bfd04654c0b9841ad57 is the first bad commit
commit 6f8bbaf568c7f2c497558bfd04654c0b9841ad57
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Tue Jul 30 00:22:53 2013 -0400

    drm/radeon/atom: initialize more atom interpretor elements to 0

    commit 42a21826dc54583cdb79cc8477732e911ac9c376 upstream.

    The ProcessAuxChannel table on some rv635 boards assumes
    the divmul members are initialized to 0 otherwise we get
    an invalid fb offset since it has a bad mask set when
    setting the fb base.  While here initialize all the
    atom interpretor elements to 0.

    Fixes:
    https://bugzilla.kernel.org/show_bug.cgi?id=60639

    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

:040000 040000 d2bb057047f71419a89def40e6e21dc948c5784c
7e49987ae73078e644723f0cb6c791e15e102ab0 M    drivers

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