[Bug 110973] New: GeForce GT 750M Mac Edition backlight - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 110973] New: GeForce GT 750M Mac Edition backlight
Date: Sun, 23 Jun 2019 20:50:45 +0000	[thread overview]
Message-ID: <bug-110973-8800@http.bugs.freedesktop.org/> (raw)

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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-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: ak-b7SOpcJQXxU@public.gmane.org
        QA Contact: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.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@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@axet-laptop:~$

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

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