[Bug 24462] New: r600: spread spectrum: flickering screen (bisected)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=24462

           Summary: r600: spread spectrum: flickering screen (bisected)
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.37-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: kronos.it at gmail.com
        Regression: Yes


2.6.37-rc5 exhibits a slight screen (notebook panel) flickering, mostly
noticeable around text (e.g. white-on-black in xterm) with occasional
horizontal lines; using 2.6.36 as known "good" kernel I've bisected the issue
down to this commit:

ba032a58d1f320039e7850fb6e8651695c1aa571 is the first bad commit
commit ba032a58d1f320039e7850fb6e8651695c1aa571
Author: Alex Deucher <alexdeucher at gmail.com>
Date:   Mon Oct 4 17:13:01 2010 -0400

    drm/radeon/kms: rework spread spectrum handling

    This patch reworks spread spectrum handling to enable it
    properly on lvds and DP/eDP links.  It also fixes several
    bugs in the old spread spectrum code.

    - Use the ss recommended reference divider if available
    when calculating the pll
    - Use the proper ss command tables on pre-DCE3 asics
    - Avoid reading past the end of the ss info tables
    - Enable ss on evergreen asics (lvds, dp, tmds)
    - Enable ss on DP/eDP links

    Signed-off-by: Alex Deucher <alexdeucher at gmail.com>
    Signed-off-by: Dave Airlie <airlied at redhat.com>

:040000 040000 2017e6abb9a12586686bcddb61479f2b158c9d7c
7e6117db061ef286ab6822455c65cf5492de7eaa M      drivers

Hardware is a M76:
01:00.0 VGA compatible controller: ATI Technologies Inc M76 [Radeon Mobility HD
2600 Series]

dmesg is attached.

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