Bug 24400 - [KMS] Radeon kernel oops (null pointer dereference) radeon_atom_encoder_mode_set
Summary: [KMS] Radeon kernel oops (null pointer dereference) radeon_atom_encoder_mode_set
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/Radeon (show other bugs)
Version: DRI git
Hardware: x86 (IA32) Linux (All)
: medium critical
Assignee: Default DRI bug account
QA Contact:
Depends on:
Reported: 2009-10-08 11:01 UTC by Tobias Droste
Modified: 2009-10-15 19:37 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

/var/log/messages drm-next modeset=1 (4.22 KB, text/plain)
2009-10-08 11:01 UTC, Tobias Droste
no flags Details
/var/log/messages drm-next modeset=0 (4.05 KB, text/plain)
2009-10-08 11:02 UTC, Tobias Droste
no flags Details
/var/log/messages 2.6.31 modeset=1 (4.09 KB, text/plain)
2009-10-08 11:03 UTC, Tobias Droste
no flags Details

Description Tobias Droste 2009-10-08 11:01:58 UTC
Created attachment 30172 [details]
/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

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
Comment 1 Tobias Droste 2009-10-08 11:02:30 UTC
Created attachment 30173 [details]
/var/log/messages drm-next modeset=0
Comment 2 Tobias Droste 2009-10-08 11:03:10 UTC
Created attachment 30174 [details]
/var/log/messages 2.6.31 modeset=1

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