BUG: unable to handle kernel NULL pointer dereference at 00000108
IP: [<f867781d>] intel_release_load_detect_pipe+0x2d/0xc0 [i915]
*pde = 5e284067 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/virtual/backlight/acpi_video0/actual_brightness
Modules linked in: ufs qnx4 hfsplus hfs minix ntfs vfat msdos fat jfs xfs exportfs reiserfs aes_i586 aes_generic binfmt_misc ppdev fbcon tileblit font bitblit softcursor vga16fb vgastate joydev arc4 snd_hda_codec_conexant snd_hda_intel snd_hda_codec snd_hwdep snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq ath5k i915 snd_timer drm_kms_helper mac80211 ath snd_seq_device drm i2c_algo_bit snd cfg80211 psmouse intel_agp serio_raw led_class soundcore snd_page_alloc agpgart video output lp parport 8139too 8139cp mii

Pid: 19350, comm: Xorg Not tainted (2.6.32-13-generic #18-Ubuntu) Presario C700 Notebook PC
EIP: 0060:[<f867781d>] EFLAGS: 00013292 CPU: 0
EIP is at intel_release_load_detect_pipe+0x2d/0xc0 [i915]
EAX: f868bd00 EBX: f4a35000 ECX: 04040404 EDX: f49c2400
ESI: 00000000 EDI: 00000003 EBP: f49bbcc0 ESP: f49bbca8
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 19350, ti=f49ba000 task=f51f0cd0 task.ti=f49ba000)
Stack:
 ff0000aa 70000000 f868bd00 f4a35000 ffffffff f49bbda8 f49bbdb8 f868540f
<0> ffffffff 00000000 f4a3531c f84d5dc8 00000003 00000000 00000000 00000000
<0> 00000000 4353544e 30383420 00000069 00000000 00000000 00000000 00000000
Call Trace:
 [<f868540f>] ? intel_tv_detect+0x8f/0x1c0 [i915]
 [<f8322c46>] ? drm_helper_probe_single_connector_modes+0x296/0x300 [drm_kms_helper]
 [<f84c6e8e>] ? drm_mode_object_find+0x4e/0x70 [drm]
 [<f84c83bf>] ? drm_mode_getconnector+0x2df/0x380 [drm]
 [<f84bd815>] ? drm_ioctl+0x185/0x370 [drm]
 [<c04c64a7>] ? hidinput_hid_event+0x1d7/0x3a0
 [<f84c80e0>] ? drm_mode_getconnector+0x0/0x380 [drm]
 [<c04c64a7>] ? hidinput_hid_event+0x1d7/0x3a0
 [<c02f1c84>] ? security_file_permission+0x14/0x20
 [<c0213e5b>] ? vfs_ioctl+0x7b/0x90
 [<c04c64a7>] ? hidinput_hid_event+0x1d7/0x3a0
 [<c0214159>] ? do_vfs_ioctl+0x79/0x310
 [<c0205750>] ? do_sync_write+0x0/0x100
 [<c0214457>] ? sys_ioctl+0x67/0x80
 [<c04c64a7>] ? hidinput_hid_event+0x1d7/0x3a0
 [<c010344c>] ? syscall_call+0x7/0xb
 [<c04c64a7>] ? hidinput_hid_event+0x1d7/0x3a0
 [<c04c64a7>] ? hidinput_hid_event+0x1d7/0x3a0
Code: e5 83 ec 18 89 5d f4 89 75 f8 89 7d fc 0f 1f 44 00 00 8b b0 ec 02 00 00 89 c3 89 d7 8b 90 cc 02 00 00 8b 80 f4 02 00 00 89 45 f0 <8b> 8e 08 01 00 00 80 bb 08 03 00 00 00 75 2c 80 7e 18 00 74 12 
EIP: [<f867781d>] intel_release_load_detect_pipe+0x2d/0xc0 [i915] SS:ESP 0068:f49bbca8
CR2: 0000000000000108
---[ end trace c584e7344043d06c ]---