[Nouveau] [Bug 34430] nouveau driver does not return VGA connector status breaking upower

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=34430

--- Comment #2 from Robert Varga <nite at hq.sk> ---
For what it's worth, when upowerd enters 100%-cpu-hog mode, this is its stack
trace (Thinkpad W520, gentoo sources 3.6.2):

Oct 15 20:09:17 [kernel] [  319.663638] upowerd         R  running task       
0  2881      1 0x00000000
Oct 15 20:09:17 [kernel] [  319.663643]  ffffffff810440ac ffffffff81364879
ffff88023487d910 ffff88023538d320
Oct 15 20:09:17 [kernel] [  319.663649]  ffff880220075fd8 0000000000011280
ffff880220075fd8 ffff88023538d320
Oct 15 20:09:17 [kernel] [  319.663654]  0000000080000000 ffff880220075fd8
ffff880220074000 000000000061a804
Oct 15 20:09:17 [kernel] [  319.663660] Call Trace:
Oct 15 20:09:17 [kernel] [  319.663665]  [<ffffffff810440ac>] ?
need_resched+0x1a/0x23
Oct 15 20:09:17 [kernel] [  319.663670]  [<ffffffff81364879>] ?
__schedule+0x37c/0x393
Oct 15 20:09:17 [kernel] [  319.663676]  [<ffffffff810440ac>] ?
need_resched+0x1a/0x23
Oct 15 20:09:17 [kernel] [  319.663681]  [<ffffffff81364b46>] ?
preempt_schedule_irq+0x3f/0x47
Oct 15 20:09:17 [kernel] [  319.663686]  [<ffffffff81365796>] ?
retint_kernel+0x26/0x30
Oct 15 20:09:17 [kernel] [  319.663720]  [<ffffffffa01aa53f>] ?
nv04_timer_read+0x51/0x64 [nouveau]
Oct 15 20:09:17 [kernel] [  319.663734]  [<ffffffffa0189824>] ?
nouveau_wait_eq+0x56/0x73 [nouveau]
Oct 15 20:09:17 [kernel] [  319.663761]  [<ffffffffa01ee629>] ?
nv50_dac_detect+0x89/0x2c6 [nouveau]
Oct 15 20:09:17 [kernel] [  319.663784]  [<ffffffffa01a1535>] ?
nouveau_connector_detect+0x243/0x267 [nouveau]
Oct 15 20:09:17 [kernel] [  319.663790]  [<ffffffff81246976>] ?
status_show+0x31/0x6c
Oct 15 20:09:17 [kernel] [  319.663796]  [<ffffffff8129019c>] ?
dev_attr_show+0x1e/0x46
Oct 15 20:09:17 [kernel] [  319.663803]  [<ffffffff8108928a>] ?
__get_free_pages+0x10/0x3f
Oct 15 20:09:17 [kernel] [  319.663808]  [<ffffffff810fc203>] ?
sysfs_read_file+0xa8/0x12e
Oct 15 20:09:17 [kernel] [  319.663812]  [<ffffffff810b54e7>] ?
vfs_read+0x9b/0xc2
Oct 15 20:09:17 [kernel] [  319.663817]  [<ffffffff810b62f9>] ?
fget_light+0x85/0x8d
Oct 15 20:09:17 [kernel] [  319.663821]  [<ffffffff810b5553>] ?
sys_read+0x45/0x6b
Oct 15 20:09:17 [kernel] [  319.663826]  [<ffffffff81365da6>] ?
system_call_fastpath+0x1a/0x1f

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