Comment 5 for bug 591825

Happened to me one time today. Here's the relevant part of syslog:

Jan 3 15:58:00 moon init: plymouth main process (290) killed by SEGV signal
Jan 3 15:58:00 moon kernel: [ 69.750059] BUG: unable to handle kernel NULL pointer dereference at 0000000000000130
Jan 3 15:58:00 moon kernel: [ 69.750068] IP: [<ffffffffa01e4b63>] intel_release_load_detect_pipe+0x33/0xc0 [i915]
Jan 3 15:58:00 moon kernel: [ 69.750095] PGD 3ee78067 PUD 3ee84067 PMD 0
Jan 3 15:58:00 moon kernel: [ 69.750101] Oops: 0000 [#1] SMP
Jan 3 15:58:00 moon kernel: [ 69.750105] last sysfs file: /sys/devices/virtual/backlight/acpi_video0/actual_brightness
Jan 3 15:58:00 moon kernel: [ 69.750110] CPU 0
Jan 3 15:58:00 moon kernel: [ 69.750111] Modules linked in: parport_pc ppdev nls_utf8 nls_cp866 vfat fat snd_hda_codec_realtek joydev arc4 ipt_REJECT xt_comment ipt_LOG xt_multiport xt_limit xt_tcpudp ipt_addrtype xt_state snd_hda_intel ip6table_filter snd_hda_codec snd_hwdep ip6_tables snd_pcm nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_nat snd_seq_midi nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack_ftp snd_rawmidi i915 rtl8187 nf_conntrack snd_seq_midi_event mac80211 snd_seq iptable_filter led_class snd_timer drm_kms_helper ip_tables snd_seq_device cfg80211 x_tables uvcvideo usbhid eeprom_93cx6 videodev drm v4l1_compat v4l2_compat_ioctl32 hid psmouse snd serio_raw i2c_algo_bit video output intel_agp soundcore snd_page_alloc lp parport usb_storage ahci r8169 mii libahci
Jan 3 15:58:00 moon kernel: [ 69.750173]
Jan 3 15:58:00 moon kernel: [ 69.750177] Pid: 1218, comm: Xorg Not tainted 2.6.35-24-generic #42-Ubuntu Base Board Product Name/Satellite L300
Jan 3 15:58:00 moon kernel: [ 69.750180] RIP: 0010:[<ffffffffa01e4b63>] [<ffffffffa01e4b63>] intel_release_load_detect_pipe+0x33/0xc0 [i915]
Jan 3 15:58:00 moon kernel: [ 69.750195] RSP: 0018:ffff88003c91fac8 EFLAGS: 00010202
Jan 3 15:58:00 moon kernel: [ 69.750198] RAX: 00000000ffffffff RBX: ffff880062235800 RCX: ffffc90005070024
Jan 3 15:58:00 moon kernel: [ 69.750201] RDX: 0000000000000003 RSI: ffff880062236000 RDI: ffff880062235800
Jan 3 15:58:00 moon kernel: [ 69.750204] RBP: ffff88003c91fb08 R08: 0000000000000000 R09: 00000000ffffffff
Jan 3 15:58:00 moon kernel: [ 69.750207] R10: 00000000ffffffff R11: 0000000000000001 R12: 0000000000000000
Jan 3 15:58:00 moon kernel: [ 69.750210] R13: ffff880062235888 R14: ffffffffa01ffd60 R15: ffff88006329f800
Jan 3 15:58:00 moon kernel: [ 69.750213] FS: 00007fb1310e9840(0000) GS:ffff880001e00000(0000) knlGS:0000000000000000
Jan 3 15:58:00 moon kernel: [ 69.750217] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jan 3 15:58:00 moon kernel: [ 69.750219] CR2: 0000000000000130 CR3: 000000003d09e000 CR4: 00000000000006f0
Jan 3 15:58:00 moon kernel: [ 69.750223] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jan 3 15:58:00 moon kernel: [ 69.750226] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jan 3 15:58:00 moon kernel: [ 69.750229] Process Xorg (pid: 1218, threadinfo ffff88003c91e000, task ffff880063addb80)
Jan 3 15:58:00 moon kernel: [ 69.750232] Stack:
Jan 3 15:58:00 moon kernel: [ 69.750234] ffff88003c91fb08 ffffffff7f0000aa ffffffffa01ffdb0 ffff880062235800
Jan 3 15:58:00 moon kernel: [ 69.750239] <0> ffff880062236000 ffff880062235888 00000000ffffffff ffff88006329f800
Jan 3 15:58:00 moon kernel: [ 69.750244] <0> ffff88003c91fc38 ffffffffa01f23af 0000000000000000 00000003f7b63777
Jan 3 15:58:00 moon kernel: [ 69.750250] Call Trace:
Jan 3 15:58:00 moon kernel: [ 69.750266] [<ffffffffa01f23af>] intel_tv_detect+0xaf/0x1a0 [i915]
Jan 3 15:58:00 moon kernel: [ 69.750276] [<ffffffffa01b1a06>] drm_helper_probe_single_connector_modes+0x2b6/0x340 [drm_kms_helper]
Jan 3 15:58:00 moon kernel: [ 69.750283] [<ffffffff815888ae>] ? mutex_lock+0x1e/0x50
Jan 3 15:58:00 moon kernel: [ 69.750303] [<ffffffffa011140a>] drm_mode_getconnector+0x34a/0x410 [drm]
Jan 3 15:58:00 moon kernel: [ 69.750314] [<ffffffffa0104433>] drm_ioctl+0x463/0x520 [drm]
Jan 3 15:58:00 moon kernel: [ 69.750327] [<ffffffffa01110c0>] ? drm_mode_getconnector+0x0/0x410 [drm]
Jan 3 15:58:00 moon kernel: [ 69.750334] [<ffffffff81162f0d>] vfs_ioctl+0x3d/0xd0
Jan 3 15:58:00 moon kernel: [ 69.750337] [<ffffffff811637e1>] do_vfs_ioctl+0x81/0x340
Jan 3 15:58:00 moon kernel: [ 69.750342] [<ffffffff81152ee2>] ? vfs_write+0x132/0x1a0
Jan 3 15:58:00 moon kernel: [ 69.750346] [<ffffffff81163b21>] sys_ioctl+0x81/0xa0
Jan 3 15:58:00 moon kernel: [ 69.750352] [<ffffffff8100a0f2>] system_call_fastpath+0x16/0x1b
Jan 3 15:58:00 moon kernel: [ 69.750354] Code: 48 89 5d d8 4c 89 65 e0 4c 89 6d e8 4c 89 75 f0 4c 89 7d f8 0f 1f 44 00 00 80 7f 68 00 4c 8b 67 30 48 89 fb 4c 8b 3f 4c 8b 77 40 <4d> 8b ac 24 30 01 00 00 75 3b 41 80 7c 24 28 00 74 16 85 d2 74
Jan 3 15:58:00 moon kernel: [ 69.750397] RIP [<ffffffffa01e4b63>] intel_release_load_detect_pipe+0x33/0xc0 [i915]
Jan 3 15:58:00 moon kernel: [ 69.750410] RSP <ffff88003c91fac8>
Jan 3 15:58:00 moon kernel: [ 69.750412] CR2: 0000000000000130
Jan 3 15:58:00 moon kernel: [ 69.750416] ---[ end trace aa72d39f5a1fe4f9 ]---