Nouveau - Feb 2011 - [Bug 34430] New: nouveau driver does not return VGA connector status breaking upower

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

           Summary: nouveau driver does not return VGA connector status
                    breaking upower
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: nuada at agh.edu.pl
         QAContact: xorg-team at lists.x.org


My laptop (Asus UL80VT) has hybrid graphics: intel+nvidia. After switching
nvidia card off using vgaswitcheroo, upower CPU consumption goes to 100%. If
nvidia card is switched back on, problem dissapeares.

This is caused by nouveau driver not returning VGA connector status properly.
When upowerd tries to read status of all connectors, it hangs waiting for VGA.

Gentoo Linux
kernel: 2.6.38-rc*
xorg-server: 1.9.4
upower: 0.9.8
KDE: 4.6.0

Steps to reproduce:
1. Log in to KDE
2. switch off nvidia:
    echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
3. cannot read VGA connector status:
    cat
/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card1/card1-VGA-1/status

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

Ilya Basin <basinilya at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |basinilya at gmail.com

--- Comment #1 from Ilya Basin <basinilya at gmail.com> 2012-09-22
06:46:53 UTC ---
Similar problem here. I added to /etc/rc.local:
  echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

When Gnome tries to start, upowerd eats 100% CPU. So, to start Gnome I have to
temporarily enable the card, then disable it again.
Similarly,
  cat
"/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0/drm/card0/card0-VGA-1/status"

hangs when the card is OFF.


Laptop Acer Aspire 5755G
Archlinux 64
kernel 3.5.3
upower 0.9.17
gnome 3.4.2

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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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--- Comment #3 from Robert Varga <nite at hq.sk> ---
Since this is not moving ahead, here's a stack trace from 3.9.4:

Call Trace:
 <IRQ>  [<ffffffff81268e82>] ? showacpu+0x42/0x60
 [<ffffffff8108b0b5>] ?
generic_smp_call_function_single_interrupt+0xb5/0x120
 [<ffffffff81023c42>] ? smp_call_function_interrupt+0x22/0x40 
 [<ffffffff814a553a>] ? call_function_interrupt+0x6a/0x70
 <EOI>  [<ffffffff814a3fd6>] ? retint_kernel+0x26/0x30
 [<ffffffff8123aa02>] ? ioread32+0x42/0x50
 [<ffffffffa03c1ce2>] ? nv04_timer_read+0x32/0x60 [nouveau]
 [<ffffffffa03c1a2a>] ? nouveau_timer_wait_eq+0x6a/0xd0 [nouveau]
 [<ffffffffa03cb40e>] ? nv50_dac_power+0x3e/0xa0 [nouveau]
 [<ffffffffa0439ed5>] ? nv50_dac_detect+0x75/0x90 [nouveau]
 [<ffffffffa0425ead>] ? nouveau_connector_detect+0x3cd/0x3e0 [nouveau]
 [<ffffffff812deebf>] ? status_show+0x3f/0x90
 [<ffffffff81350ac7>] ? dev_attr_show+0x17/0x50
 [<ffffffff810e0d02>] ? __get_free_pages+0x12/0x50
 [<ffffffff8118b15e>] ? sysfs_read_file+0xae/0x1a0
 [<ffffffff81124ce0>] ? vfs_read+0xa0/0x160
 [<ffffffff81124f31>] ? sys_read+0x51/0xa0
 [<ffffffff814a4616>] ? system_call_fastpath+0x1a/0x1f

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--- Comment #4 from Robert Varga <nite at hq.sk> ---
Created attachment 79854
  --> https://bugs.freedesktop.org/attachment.cgi?id=79854&action=edit
Proposed fix

Tested on 3.9.4, seems to hide/fix the issue.

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Pierre Moreau <pierre.morrow at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #5 from Pierre Moreau <pierre.morrow at free.fr> ---
I did a quick check and it doesn't seem like the proposed fix was merged.
Does
it still occur on a recent kernel (3.18, 3.19-rc4)?

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEEDINFO                    |RESOLVED

--- Comment #6 from Martin Peres <martin.peres at free.fr> ---
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