Nouveau - Jun 2012 - [Bug 51281] New: X server restarts on brightness change

https://bugs.freedesktop.org/show_bug.cgi?id=51281

             Bug #: 51281
           Summary: X server restarts on brightness change
    Classification: Unclassified
           Product: xorg
           Version: 7.6 (2010.12)
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: mpapis at gmail.com
         QAContact: xorg-team at lists.x.org


Created attachment 63284
  --> https://bugs.freedesktop.org/attachment.cgi?id=63284
Xorg.0.log.old after the restart

It does not happen just after server is started, need some time for it, few
hours maybe few times sleep to ram.

This situation repeats multiple times already, I can not normally work as every
evening / morning when I want to adjust brightness X restarts and all my
applications are closed.
>From the Xorg.0.log the part "evdev: Power Button: Close" is
repeating.
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--- Comment #1 from Michal Papis <mpapis at gmail.com> 2012-06-21 00:19:01
PDT ---
Created attachment 63285
  --> https://bugs.freedesktop.org/attachment.cgi?id=63285
output from dmesg

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Emil Velikov <emil.l.velikov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #63284|application/x-trash         |text/plain
          mime type|                            |

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Emil Velikov <emil.l.velikov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #63285|text/x-log                  |text/plain
          mime type|                            |

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--- Comment #8 from Maarten Maathuis <madman2003 at gmail.com> 2012-06-21
13:48:36 UTC ---
It seems there is (another) way to control the backlight.

/sys/class/backlight/nv_backlight/brightness

You can write to that, but check the value of
/sys/class/backlight/nv_backlight/max_brightness first.

I'm not a 100% sure the name is nv_backlight, but that should be easy to
check.

Please try that and see if this causes problems.

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--- Comment #10 from Michal Papis <mpapis at gmail.com> 2012-06-21
14:01:36 UTC ---
there was only one device and it also worked to use it:

$ echo 8 | sudo tee /sys/class/backlight/acpi_video0/brightness
root's password:
8
$ echo 6 | sudo tee /sys/class/backlight/acpi_video0/brightness
6

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--- Comment #2 from Marcin Slusarz <marcin.slusarz at gmail.com>
2012-06-21 09:30:21 PDT ---
There's nothing about Nouveau crashing in these logs.
Maybe something reprograms brightness button to do something which triggers
xserver shutdown?

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--- Comment #3 from Michal Papis <mpapis at gmail.com> 2012-06-21 09:52:28
PDT ---
The restart is rather instant, and it happens the same if I use keyboard to
change brightness or the Xfce panel plugin for brightness.

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--- Comment #15 from Michal Papis <mpapis at gmail.com> 2012-06-21
17:30:02 UTC ---
and then I tried to do darker with keyboard and it crashed right away, so any
switches, options configurations to produce more output/log I can attach, just
please make them not to annoying.

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--- Comment #4 from Maarten Maathuis <madman2003 at gmail.com> 2012-06-21
11:33:37 PDT ---
Does "xrandr --verbose" show some kind of brightness property attached
to
LVDS-1?

If so, does modifying this cause the same problems? Please double check that
the property actually changes.

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--- Comment #5 from Michal Papis <mpapis at gmail.com> 2012-06-21 12:06:50
PDT ---
$ xrandr --verbose | grep rightness
    Brightness: 1.0
$ xrandr --output LVDS-1 --brightness 0.8
$ xrandr --verbose | grep rightness
    Brightness: 0.80

And I see the difference ... I will try to repeat it later as it does not
happen always.

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--- Comment #6 from Maarten Maathuis <madman2003 at gmail.com> 2012-06-21
12:33:15 PDT ---
Oh, that brightness just adjust the gamma settings, but doesn't affect the
backlight. Isn't there another setting somewhere? Maybe paste the output of
"xrandr --verbose"?

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--- Comment #7 from Michal Papis <mpapis at gmail.com> 2012-06-21 12:49:32
PDT ---
Created attachment 63323
  --> https://bugs.freedesktop.org/attachment.cgi?id=63323
xrandr --verbose

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--- Comment #9 from Maarten Maathuis <madman2003 at gmail.com> 2012-06-21
13:53:02 PDT ---
Also check if there is more than one backlight device and try those too.

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Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |peter.hutterer at who-t.net

--- Comment #11 from Peter Hutterer <peter.hutterer at who-t.net>
2012-06-21 16:17:16 PDT ---
I don't think that's a keyboard issue, otherwise it wouldn't crash
on manual
panel trigger. quick skim of the xfce power manager plugin code shows you can
run that manually with "set-brightness", can you check if this works?

the other possibility: if xfce4 crashes it may shut down your X server, similar
to how GNOME does it. Do see the same effect if you run xinit and then start
xfce from the terminal?

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Michal Papis <mpapis at gmail.com> changed:

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

--- Comment #12 from Michal Papis <mpapis at gmail.com> 2012-06-21
16:31:15 PDT ---
ok I need some help here, how do I manually "set-brightness"?

as for the second possibility, is there no other way, maybe some config file to
enable additional logging?

I'm using this setup for work so any interruptions and inconveniences are
not
welcome - and as the issue happens after few hours you understand it might be
hard to run it using single commands.

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--- Comment #13 from Peter Hutterer <peter.hutterer at who-t.net>
2012-06-21 16:56:50 PDT ---
again, just looking at the source here but there should be a
xfce4-power-manager binary that takes a set-brightness argument or so. I
suspect that's the one called from the panel and may be the one that crashes
xfce.

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--- Comment #14 from Michal Papis <mpapis at gmail.com> 2012-06-21
17:26:21 PDT ---
just checked, there is no option to steer it from command line, it's all
automated stuff, I can not trigger the change manually unless using keybord /
panel icon.

btw. I just tried both 

echo 6 | sudo tee /sys/class/backlight/acpi_video0/brightness
xrandr --output LVDS-1 --brightness 0.8

with different values, they all worked fine

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|X server restarts on        |[NVCE] X server restarts on
                   |brightness change           |brightness change

--- Comment #16 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Please check whether this still happens with the latest xf86-video-nouveau and
kernel.

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Michal Papis <mpapis at gmail.com> changed:

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |WORKSFORME

--- Comment #17 from Michal Papis <mpapis at gmail.com> ---
I forgot about this bug - it's working for me now ...

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