[Bug 27824] New: Screen brightness fluctuates with certain Compiz plug-ins

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27824

           Summary: Screen brightness fluctuates with certain Compiz
                    plug-ins
           Product: xorg
           Version: 7.4
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: admodinos at kolumbus.fi
         QAContact: xorg-team at lists.x.org


Created an attachment (id=35271)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=35271)
Video capture of symptoms with Expo, desktop switch, and zoom

Zooming in with Super+Scroll causes the screen to become very dark, practically
unreadable. Adjusting Fn+Brightness doesn't fix this, although I can tell the
brightness changing slightly. The same thing happens when changing workspaces
(Ctrl+Alt+-> or Ctrl+Alt+<-), dragging a window from one workspace to another,
or using Expo (Super+E) to view all workspaces simultaneously. Returning to
normal zoom level will always restore the correct level of brightness
immediately, corresponding to how it might have been adjusted during black out.
Darkness applies to everything on the screen, except the cursor which remains
bright against everything else.

I originally reported this against the kernel in Launchpad:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/539163

My hardware is ATi FireGL 9000 Mobility, but others have confirmed the bug on
at least Radeon Mobility 7500 and Radeon 9200.

Let me know if you need attachments other than those already posted in the
Launchpad bug report.

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