BUG: unable to handle kernel NULL pointer dereference at 00000100
IP: [<f821f540>] r300_emit_raw_packet3+0xab0/0xf50 [radeon]
*pde = 77b19067 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/pci0000:00/0000:00:01.0/0000:01:05.0/enable
Modules linked in: snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy arc4 snd_seq_oss snd_seq_midi ecb snd_rawmidi snd_seq_midi_event snd_seq iptable_filter ath5k snd_timer snd_seq_device ip_tables x_tables mac80211 sdhci_pci joydev ath snd soundcore sdhci i2c_piix4 snd_page_alloc cfg80211 psmouse lp parport led_class serio_raw shpchp dm_raid45 xor ohci1394 8139too usbhid 8139cp mii radeon ttm drm i2c_algo_bit ieee1394 video output ati_agp agpgart

Pid: 1172, comm: Xorg Not tainted (2.6.31-14-generic #46-Ubuntu) ATI RC4xxx-SB4xx
EIP: 0060:[<f821f540>] EFLAGS: 00013246 CPU: 0
EIP is at r300_emit_raw_packet3+0xab0/0xf50 [radeon]
EAX: f68b2000 EBX: f68b2000 ECX: 00000000 EDX: 80000000
ESI: fffffffd EDI: 00000100 EBP: f6789dd4 ESP: f6789db0
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 1172, ti=f6788000 task=f6453ed0 task.ti=f6788000)
Stack:
 f8211ca2 00000001 f82902ed f824ef2e f828944c 80000000 2f710000 02000000
<0> f68b2000 f6789e00 f82121ff f68b3400 00002000 f67e8000 f68b22d4 f70d0058
<0> 00002000 f68b2000 f68b2000 2f710000 f6789e48 f8213884 00000001 f82902ed
Call Trace:
 [<f8211ca2>] ? radeon_set_igpgart+0x272/0x710 [radeon]
 [<f82121ff>] ? radeon_set_pcigart+0xbf/0x250 [radeon]
 [<f8213884>] ? radeon_do_init_cp+0xa44/0xda0 [radeon]
 [<f8213c6f>] ? radeon_cp_init+0x8f/0x100 [radeon]
 [<c02c7795>] ? security_capable+0x25/0x30
 [<f81166c0>] ? drm_ioctl+0x180/0x360 [drm]
 [<f8213be0>] ? radeon_cp_init+0x0/0x100 [radeon]
 [<c02c7acf>] ? security_file_permission+0xf/0x20
 [<c01f4cf3>] ? vfs_ioctl+0x73/0x90
 [<c01f4fc1>] ? do_vfs_ioctl+0x71/0x310
 [<c01e7100>] ? do_sync_write+0x0/0x100
 [<c01f52bf>] ? sys_ioctl+0x5f/0x80
 [<c010336c>] ? syscall_call+0x7/0xb
Code: e4 ac 28 f8 89 4c 24 0c e8 e2 ee 34 c8 b8 ea ff ff ff e9 2c f6 ff ff 8d 74 26 00 89 54 24 08 c7 44 24 04 7a 34 25 f8 c7 04 24 f8 <ae> 28 f8 e8 bc ee 34 c8 b8 ea ff ff ff e9 06 f6 ff ff 8d b6 00 
EIP: [<f821f540>] r300_emit_raw_packet3+0xab0/0xf50 [radeon] SS:ESP 0068:f6789db0
CR2: 0000000000000100
---[ end trace db200dc9b61c0eeb ]---