Public bug reported:
I type
sudo pm-suspend
on the command line.
The screen goes black for about ten or fifteen seconds, the computer
does not go into low-power mode, the screen comes back on.
Looking at dmesg shows:
[14196.989910] PM: Syncing filesystems ... done.
[14197.073199] Freezing user space processes ...
[14217.064138] Freezing of tasks failed after 20.01 seconds (1 tasks refusing
to freeze, wq_busy=0):
[14217.064165] pci_devices D ffff88023bc53f40 0 1422 1385 0x00000004
[14217.064171] ffff8801570d5dd0 0000000000000086 ffff88022d600000
ffff8801570d5fd8
[14217.064176] ffff8801570d5fd8 ffff8801570d5fd8 ffff8802304d9740
ffff88022d600000
[14217.064181] ffff8802307b10f8 ffff88022d600000 ffff8802307b10fc
00000000ffffffff
[14217.064186] Call Trace:
[14217.064201] [<ffffffff816c9fd9>] schedule+0x29/0x70
[14217.064206] [<ffffffff816ca28e>] schedule_preempt_disabled+0xe/0x10
[14217.064211] [<ffffffff816c8de7>] __mutex_lock_slowpath+0xd7/0x150
[14217.064216] [<ffffffff816c88ba>] mutex_lock+0x2a/0x50
[14217.064225] [<ffffffff8145a893>] control_store+0x53/0xe0
[14217.064230] [<ffffffff81450df8>] dev_attr_store+0x18/0x30
[14217.064238] [<ffffffff812068fc>] sysfs_write_file+0xdc/0x150
[14217.064244] [<ffffffff811940cc>] vfs_write+0xac/0x180
[14217.064248] [<ffffffff81194412>] sys_write+0x52/0xa0
[14217.064255] [<ffffffff816d379d>] system_call_fastpath+0x1a/0x1f
[14217.064280]
[14217.064282] Restarting tasks ... done.
[14217.627873] video LNXVIDEO:00: Restoring backlight state
I am using Lubuntu 13.04 on a fresh install.
** Affects: pm-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1173742
Title:
Lubuntu 13.04 fails to suspend
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