FS#18804 - [kernel26]Using the KMS option of the radeon-driver makes the kernel segfault and reboot when startx

Attached to Project: Arch Linux
Opened by lh (jarryson) - Tuesday, 23 March 2010, 16:37 GMT
Last edited by Andreas Radke (AndyRTR) - Wednesday, 12 May 2010, 20:19 GMT
Task Type Bug Report
Category Packages: Testing
Status Closed
Assigned To Tobias Powalowski (tpowa)
Thomas Bächler (brain0)
Andreas Radke (AndyRTR)
Architecture All
Severity High
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 2
Private No

Details

https://bugzilla.kernel.org/show_bug.cgi?id=15287
http://bbs.archlinux.org/viewtopic.php?id=92311

my card is X700 mobility (RV420 5653) CPU is AMD turion mt34 and notebook is Uniwill p50ca(motherboard is VIA K8T890)

i have no problem using KMS and 3D acceleration with 2.6.31. but after upgrade kernel26 to 2.6.33, i can not start x when KMS enabled. the system will reboot immediately.

from kernel bugzilla, i found the solution, need a patch to disable msi on via motherboard, i don't know what msi is, but it works.

i can compile the kernel myself, but i see someone else in the forume meet the same problem, so hope arch official add this patch till main kernel tree merge it.
This task depends upon

Closed by  Andreas Radke (AndyRTR)
Wednesday, 12 May 2010, 20:19 GMT
Reason for closing:  Upstream
Additional comments about closing:  workarounds known, see comment.
Comment by Andreas Radke (AndyRTR) - Wednesday, 24 March 2010, 09:47 GMT
http://bugs.freedesktop.org/show_bug.cgi?id=25662 - similar issue for X200m cards. But this is no stopper for me. It's safe to disable KMS mode and run X in UMS until it will fixed.
Comment by Andreas Radke (AndyRTR) - Wednesday, 12 May 2010, 20:18 GMT
You can add "pci=nomsi" to your kernel boot line or disable KMS until we ship a new version including the upstream fix.

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