In many (not all) cases module has been found not to work properly with 2.6.12
kernel, producing output:

------------[ cut here ]------------
kernel BUG at include/linux/dcache.h:294!
invalid operand: 0000 [#1]
PREEMPT
Modules linked in: via drm nsc_ircc snd_pcm_oss snd_mixer_oss snd_seq_oss
snd_seq_midi_event snd_seq parport_pc parport psmouse pcspkr snd_via82xx
gameport snd_ac97_codec snd_pcm snd_timer snd_page_alloc snd_mpu401_uart
snd_rawmidi snd_seq_device snd via_ircc irda acerhk amd64_agp agpgart eth1394
sata_via sata_svw libata sbp2 ohci1394 ieee1394 usb_storage usbhid
CPU:    0
EIP:    0060:[<c019d25c>]    Not tainted VLI
EFLAGS: 00213246   (2.6.12-gentoo)
EIP is at sysfs_remove_dir+0xfc/0x110
eax: 00000000   ebx: db5aaf30   ecx: ffffffff   edx: ddf6f280
esi: db5aa800   edi: db891d14   ebp: dc5c16c0   esp: dac0de94
ds: 007b   es: 007b   ss: 0068
Process X (pid: 12235, threadinfo=dac0c000 task=db1835a0)
Stack: dc62c9c0 dce3783a c04faea0 db5aaf30 db5aa800 dc62c940 dc5c16c0 c0300670
       db5aaf30 db5aaf30 c03006a0 db5aaf30 00000002 dc62cb20 df03d72d db5aaf30
       dbb71380 df03e3a8 ffffffff 00203282 00000000 dac0c000 db5aa800 ddf64c80
Call Trace:
[<c0300670>] kobject_del+0x10/0x20
[<c03006a0>] kobject_unregister+0x20/0x30
[<df03d72d>] drm_takedown+0x34d/0x3f0 [drm]
[<df03e3a8>] drm_fasync+0x48/0x90 [drm]
[<df03e7c5>] drm_release+0x3d5/0x540 [drm]
[<df03d950>] drm_version+0x0/0xa0 [drm]
[<df03dbb3>] drm_ioctl+0x1c3/0x23c [drm]
[<c0246400>] udf_create+0x30/0x1b0
[<df03d950>] drm_version+0x0/0xa0 [drm]
[<c0246400>] udf_create+0x30/0x1b0
[<c0172cb7>] do_ioctl+0x77/0xb0
[<c015f58a>] __fput+0x16a/0x1b0
[<c015d942>] filp_close+0x52/0xa0
[<c015d9e8>] sys_close+0x58/0xa0
[<c010325b>] sysenter_past_esp+0x54/0x75
Code: 89 44 24 08 8b 00 89 04 24 e8 c1 a9 fa ff 8b 54 24 08 8b 42 04 89 04 24 e8
32 35 16 00 8b 44 24 08 89 04 24 e8 a6 a9 fa ff eb 93 <0f> 0b 26 01 a2 94 49 c0
e9 17 ff ff ff 8d b4 26 00 00 00 00 83

In most cases where error occures X does not start, in my case on Xorg exit i
get blank screen, when looking at dmesg through ssh i se the above.

My configuration:
Linux gentoo,
Acer Aspire 1362 laptop, k8n800 chipset (using snapshot unichrome driver from
http://myth.ivor.org , cvs drm module from dri cvs), kernel 2.6.12 (with 2.6.11
it worked fine, gentoo-sources), Xorg 6.8.2 (6.8.2-r2 ebuild). AMD Mobile
Sempron 2800+.

On request I can send my kernel configuration.