Nouveau - Jun 2019 - [Bug 110973] New: GeForce GT 750M Mac Edition backlight

https://bugs.freedesktop.org/show_bug.cgi?id=110973

            Bug ID: 110973
           Summary: GeForce GT 750M Mac Edition backlight
           Product: Mesa
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: ak at axet.ru
        QA Contact: nouveau at lists.freedesktop.org

Created attachment 144616
  --> https://bugs.freedesktop.org/attachment.cgi?id=144616&action=edit
sudo acpidump -o acpidump.txt

Hello!

I notice when laptop display went off, it keep backlight on.

Technically speaking this:

# xset dpms force off

only set screen to black, without turning off LCD backlight.

My kernel has "acpi_backlight=vendor" which enables backlight control
from
function keys and gnome recognize those actions by displaying popup with
current brightness level.

Everything seems works fine, I've been able to turn display off using:

# echo 0 > /sys/devices/pnp0/00:03/backlight/gmux_backlight/brightness

But still no luck with 'xset'.

axet at axet-laptop:~$ ls -al /sys/class/backlight/
total 0
drwxr-xr-x  2 root root 0 июн 23 23:13 .
drwxr-xr-x 67 root root 0 июн 23 23:13 ..
lrwxrwxrwx  1 root root 0 июн 23 23:13 gmux_backlight ->
../../devices/pnp0/00:03/backlight/gmux_backlight
axet at axet-laptop:~$



Maybe related: https://bugs.freedesktop.org/show_bug.cgi?id=106869

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--- Comment #1 from Alexey Kuznetsov <ak at axet.ru> ---
Created attachment 144617
  --> https://bugs.freedesktop.org/attachment.cgi?id=144617&action=edit
sudo fwts > fwts

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--- Comment #2 from Alexey Kuznetsov <ak at axet.ru> ---
Created attachment 144618
  --> https://bugs.freedesktop.org/attachment.cgi?id=144618&action=edit
sudo fwts method > fwts_method

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--- Comment #3 from Alexey Kuznetsov <ak at axet.ru> ---
Created attachment 144619
  --> https://bugs.freedesktop.org/attachment.cgi?id=144619&action=edit
sudo dmidecode > dmidecode.log

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--- Comment #4 from Alexey Kuznetsov <ak at axet.ru> ---
Created attachment 144620
  --> https://bugs.freedesktop.org/attachment.cgi?id=144620&action=edit
grep -r . /proc/acpi > acpi

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--- Comment #5 from Alexey Kuznetsov <ak at axet.ru> ---
PS: I do not remember, if it is ever worked.

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--- Comment #6 from Alexey Kuznetsov <ak at axet.ru> ---
Interesting note. After suspend/resume it starts to work properly.

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GitLab Migration User <gitlab-migration at fdo.invalid> changed:

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

--- Comment #7 from GitLab Migration User <gitlab-migration at
fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1181.

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