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happens approx one out of ten times.
afterwards, system wont suspend anymore.

from syslog:
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.217843] general protection fault: 0000 [#1] SMP 
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.217922] CPU 2 
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.217944] Modules linked in: bnep rfcomm bluetooth parport_pc ppdev binfmt_misc 
snd_hda_codec_conexant snd_hda_intel snd_hda_codec snd_hwdep cdc_ether snd_pcm uvcvideo videodev ums_realtek usbnet v4l2_compat_
ioctl32 snd_seq_midi cdc_acm cdc_wdm uas joydev snd_rawmidi snd_seq_midi_event dm_multipath snd_seq lib80211_crypt_tkip i915 psm
ouse snd_timer snd_seq_device intel_ips drm_kms_helper serio_raw sparse_keymap wl(P) snd drm i2c_algo_bit mei(C) mac_hid video w
mi soundcore snd_page_alloc lib80211 lp parport usb_storage tg3 dm_raid45 xor dm_mirror dm_region_hash dm_log
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.218781] 
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.218803] Pid: 13719, comm: pm-suspend Tainted: P         C O 3.2.0-26-generic #
41-Ubuntu Acer TravelMate 8172/TravelMate 8172
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.218916] RIP: 0010:[<ffffffff81513dcd>]  [<ffffffff81513dcd>] led_trigger_unreg
ister+0x3d/0xe0
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219004] RSP: 0018:ffff88019e833ca8  EFLAGS: 00010296
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219051] RAX: dead000000200200 RBX: ffff8801e892ffc0 RCX: 0000000000000008
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219111] RDX: dead000000100100 RSI: dead000000100100 RDI: dead000000200200
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219171] RBP: ffff88019e833cc8 R08: ffffffff81cdda20 R09: 0000000000000100
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219230] R10: 0000000000000008 R11: 0000000000000001 R12: ffff88022ae49820
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219289] R13: ffff8801e892ffc0 R14: ffff88022e2fd378 R15: 0000000000000000
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219349] FS:  00007ffba2e8d700(0000) GS:ffff88023bc80000(0000) knlGS:0000000000
000000
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219415] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219465] CR2: 00007f6025b23020 CR3: 00000001da161000 CR4: 00000000000006e0
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219524] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219584] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219643] Process pm-suspend (pid: 13719, threadinfo ffff88019e832000, task ffff8801e88edbc0)
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219713] Stack:
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219736]  ffff88022e2fd378 ffff8801e892ffc0 ffff88022ae49820 00000000fffffffe
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219827]  ffff88019e833ce8 ffffffff81513e8b ffff88022c9e3010 ffff88022ae49840
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.219916]  ffff88019e833d08 ffffffff814dc61c ffff88019e833d08 ffff88022ae49840
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220005] Call Trace:
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220035]  [<ffffffff81513e8b>] led_trigger_unregister_simple+0x1b/0x30
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220097]  [<ffffffff814dc61c>] power_supply_remove_triggers+0x4c/0xb0
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220155]  [<ffffffff814db996>] power_supply_unregister+0x36/0x50
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220214]  [<ffffffff81397ff7>] sysfs_remove_battery+0x3c/0x54
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220269]  [<ffffffff81398cd2>] battery_notify+0x2e/0x3d
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220324]  [<ffffffff8165d8fd>] notifier_call_chain+0x4d/0x70
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220382]  [<ffffffff81090798>] __blocking_notifier_call_chain+0x58/0x80
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220443]  [<ffffffff810907d6>] blocking_notifier_call_chain+0x16/0x20
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220503]  [<ffffffff810aa38a>] pm_notifier_call_chain+0x1a/0x30
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220586]  [<ffffffff810ab64b>] enter_state+0xfb/0x110
JuJul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220815]  [<ffffffff811ebf5f>] sysfs_write_file+0xef/0x170
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220896]  [<ffffffff81177f63>] vfs_write+0xb3/0x180
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220966]  [<ffffffff8117828a>] sys_write+0x4a/0x90
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.221037]  [<ffffffff81661fc2>] system_call_fastpath+0x16/0x1b
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.221115] Code: 49 89 fd 48 c7 c7 20 af c9 81 e8 9f 4e 14 00 49 8b 45 38 49 8b 55 30 48 be 00 01 10 00 00 00 ad de 48 bf 00 02 20 00 00 00 ad de <48> 89 42 08 48 89 10 49 89 75 30 49 89 7d 38 48 c7 c7 20 af c9 
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.221853] RIP  [<ffffffff81513dcd>] led_trigger_unregister+0x3d/0xe0
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.221953]  RSP <ffff88019e833ca8>
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.225580] ---[ end trace 9285cfef3511d90c ]---
l  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220657]  [<ffffffff810a9fe7>] state_store+0xb7/0x130
Jul  7 11:31:17 aj-TravelMate-8172 kernel: [11646.220734]  [<ffffffff8130ce2f>] kobj_attr_store+0xf/0x30

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pm-utils 1.4.1-9
ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
Uname: Linux 3.2.0-26-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.0.1-0ubuntu8
Architecture: amd64
Date: Mon Jul 16 16:37:25 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug precise
-- 
pm-suspend crashes sometimes (removing triggers)
https://bugs.launchpad.net/bugs/1025292
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