[Bug 47067] New: Black flickering on LVDS of Acer Aspire 7560G with R600g

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47067

             Bug #: 47067
           Summary: Black flickering on LVDS of Acer Aspire 7560G with
                    R600g
    Classification: Unclassified
           Product: xorg
           Version: 7.6 (2010.12)
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: runetmember at gmail.com
         QAContact: xorg-team at lists.x.org


Hardware:
Acer Aspire 7560G, A8-3500M - Radeon HD 6620G, external display attached via
HDMI.

Software:
That laptop is supported since Linux 3.2, so because of that I use it for four
months with Kubuntu 11.10, Linux 3.2, Xorg Edgers PPA, KDE 4.7. Now I upgrade
to Kubuntu 12.04 with Linux 3.2, Mesa 8.0.1, KDE 4.8 and issue almost the same
(but flickering is less often than before).

Steps to reproduce:
In November and December (with latest at this moment R600g from Xorg Edgers PPA
and KDE 4.7)  issue is reproduceable even when I click to Kickoff or
minimize/maximize apps (it still happen sometimes but very rare). Now (with
default driver in Kubuntu 12.04 and KDE 4.8) steps to reproduce is a little
different but that still easy - flickering is reproduceable when KWin playback
animation of "carousel", "desktop cube", "slide back" (and probably many
others) effects.

How that black flickering looks like:
It's looks like black rectangle/polygon that cover 1/3 of display in the middle
or bottom.

Additinal information:
Discrete GPU is disabled on every boot by script. Usually I use DynPM power
profile for GPU in APU, but that probably unrelated to this issue, because with
default profile issue looks the same.
Issue is reproduceable only with OpenGL version of KWin. There is no black
flickering on LVDS with OpenGL ES version of KWin. Issue is also visible only
on LVDS, never on external display that attached to HDMI (that selected as main
in KDE display settings). Issue is also reproduceable when external display is
not attached.
There is no black flickering on LVDS with fglrx.

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