[Bugme-new] [Bug 12444] New: X hangs following switch from radeonfb console - Bisected

[bugme-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=12444

           Summary: X hangs following switch from radeonfb console -
                    Bisected
           Product: Drivers
           Version: 2.5
     KernelVersion: 2.6.29-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI)
        AssignedTo: drivers_video-dri at kernel-bugs.osdl.org
        ReportedBy: graham at gmurray.org.uk


Latest working kernel version:2.6.28
Earliest failing kernel version:2.6.29-rc1
Distribution:Gentoo
Hardware Environment:Core2 duo 6700, Radeon X300
Software Environment: Xorg-x11 7.4, xf86-video-ati 6.10, kde-4.1.3, libx11
1.1.5
Problem Description: On switching from KDE-4 with desktop effects enabled to
'text' console and back leave X hung with top, approximately 1/3, of screen
corrupted, keyboard and mouse are unresponsive. SAK K returns to kdm login
screen. If desktop effects are not enabled, all works OK. 

I have bisected the problem and the commit which introduces it is
7c1c2871a6a3a114853ec6836e9035ac1c0c7f7a drm: move to kref per-master
structures.

Steps to reproduce:Configure kernel for radeonfb, 
Start KDE with desktop effects enabled
Switch to 'text' console and back to X
Top, approximately 1/3, of screen is corrupted, keyboard and mouse are
unresponsive. SAK K returns to kdm login screen.


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