http://bugs.freedesktop.org/show_bug.cgi?id=24400
Summary: [KMS] Radeon kernel oops (null pointer dereference)
radeon_atom_encoder_mode_set
Product: DRI
Version: XOrg CVS
Platform: x86 (IA32)
OS/Version: Linux (All)
Status: NEW
Severity: major
Priority: medium
Component: DRM/Radeon
AssignedTo: dri-devel@lists.sourceforge.net
ReportedBy: tdro...@gmx.de
Created an attachment (id=30172)
--> (http://bugs.freedesktop.org/attachment.cgi?id=30172)
/var/log/messages drm-next modeset=1
My system is a Pentium4 (32bit) with a Radeon x850pro (AGP).
I tried the drm-next kernel (build date Wed Sep 16 09:14:34 CEST 2009), but
with radeon kms enabled I get an kernel oops:
drm-next (modeset=1) --> "/var/log/messages drm-next modeset=1" attachment
With kernel 2.6.31 (same config) it works:
2.6.31 (modeset=1) --> "/var/log/messages 2.6.31 modeset=1" attachment
I also tried booting the drm-next kernel with radeon.modeset=0, unload the
radeon module and load it with modeset=1. The result is also a working
environment but many artifacts:
drm-next (modeset=0) --> "/var/log/messages drm-next modeset=0" attachment
Error:
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<f8cb74ba>] radeon_atom_encoder_mode_set+0x26a/0x950 [radeon]
*pde = 00000000
Oops: 0000 [#1] PREEMPT SMP
last sysfs file: /sys/devices/platform/radeon_cp.0/firmware/radeon_cp.0/loading
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