[Bug 33812] New: radeon with modeset option causes oops as secondary adapter (vgaswitcheroo)

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=33812

           Summary: radeon with modeset option causes oops as secondary
                    adapter (vgaswitcheroo)
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.38.3
          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: jcnengel at googlemail.com
        Regression: Yes


Created an attachment (id=54942)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=54942)
kernel log

System: Lenovo ThinkPad T500
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD 3650
using vgaswitcheroo

Trying to load radeon (as a module or in kernel) with modeset not explicitly
disabled causes a kernel NULL pointer dereference if i915 has initialised the
fb console already. 
That behaviour did not occur in 2.6.38, only after upgrading to 2.6.38.3
(haven't had the time to bisect yet).

If I disable switching in the BIOS and move to the radeon card as exclusive
adapter, everything works fine. with dual graphics stack

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