|Summary:||radeon with modeset option causes oops as secondary adapter (vgaswitcheroo)|
|Product:||Drivers||Reporter:||Johannes Engel (jcnengel)|
|Component:||Video(DRI - non Intel)||Assignee:||Dave Airlie (airlied)|
|Severity:||high||CC:||airlied, alexdeucher, blazej.bucko, florian, maciej.rutecki, rjw, sfrench|
|Bug Depends on:|
Description Johannes Engel 2011-04-21 23:14:59 UTC
Created attachment 54942 [details] 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 188.8.131.52 (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
Comment 2 Rafael J. Wysocki 2011-04-30 22:14:26 UTC
*** Bug 34022 has been marked as a duplicate of this bug. ***
Comment 3 Dave Airlie 2011-05-01 08:07:11 UTC
don't suppose anyone can bisect this? you'd only have to bisect drivers/gpu I can probably try and reproduce it next week.
Comment 4 Dave Airlie 2011-05-01 10:14:41 UTC
Created attachment 56052 [details] attempted fix. please test this.
Comment 5 blazej.bucko 2011-05-01 11:24:51 UTC
It seems to be working fine.
Comment 6 Johannes Engel 2011-05-01 11:47:47 UTC
I confirm that Dave's patch resolves the issue. Thanks a lot!
Comment 7 Rafael J. Wysocki 2011-05-01 11:57:39 UTC
*** Bug 33422 has been marked as a duplicate of this bug. ***
Comment 8 Rafael J. Wysocki 2011-05-01 12:00:54 UTC
Handled-By : Dave Airlie <firstname.lastname@example.org> Patch : https://bugzilla.kernel.org/attachment.cgi?id=56052
Comment 9 Steve French 2011-05-02 02:54:14 UTC
I get this frequently on rc3, but have run more recent builds or with this patch yet.
Comment 10 Johannes Engel 2011-05-03 21:37:08 UTC
Hi Dave, can we expect this patch in 184.108.40.206?
Comment 11 Rafael J. Wysocki 2011-05-04 16:33:09 UTC
Fixed by http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=eaa4f5e1d0b816291a59a47917e569c0384f2b6f @Johannes: The commit has been annotated as "Cc: email@example.com", so the answer is yes, you can.