[Bug 29272] New: [BISECTED] Screen becomes corrupted when switching video mode with Radeon KMS

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=29272

           Summary: [BISECTED] Screen becomes corrupted when switching
                    video mode with Radeon KMS
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.38-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: jlp.bugs at gmail.com
                CC: alexdeucher at gmail.com
        Regression: Yes


After updating the kernel to 2.6.38-rc5 screen gets corrupted when video mode
switches for KMS. This is on laptop eMachines E640G with integrated ATI
Mobility Radeon HD 5470. It was working just fine with -rc4. I have bisected
the commits and this one was pointed out as the culprit:

5b40ddf888398ce4cccbf3b9d0a18d90149ed7ff is the first bad commit
commit 5b40ddf888398ce4cccbf3b9d0a18d90149ed7ff
Author: Alex Deucher <alexdeucher at gmail.com>
Date:   Mon Feb 14 11:43:11 2011 -0500

    drm/radeon/kms: hopefully fix pll issues for real (v3)

    The problematic boards have a recommended reference divider
    to be used when spread spectrum is enabled on the laptop panel.
    Enable the use of the recommended reference divider along with
    the new pll algo.

    v2: testing options

    v3: When using the fixed reference divider with LVDS, prefer
    min m to max p and use fractional feedback dividers.

    Fixes:
    https://bugzilla.kernel.org/show_bug.cgi?id=28852
    https://bugzilla.kernel.org/show_bug.cgi?id=24462
    https://bugzilla.kernel.org/show_bug.cgi?id=26552
    MacbookPro issues reported by Justin Mattock <justinmattock at gmail.com>

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

:040000 040000 8736f993b97cc8370fd29048761a1e0da4969306
657bdb221e3f4da6efdfec02f8f348db5a537b29 M      drivers

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