Bug 110973 - GeForce GT 750M Mac Edition backlight
Summary: GeForce GT 750M Mac Edition backlight
Status: RESOLVED MOVED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/nouveau (show other bugs)
Version: unspecified
Hardware: Other All
: medium normal
Assignee: Nouveau Project
QA Contact: Nouveau Project
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-06-23 20:50 UTC by Alexey Kuznetsov
Modified: 2019-09-18 20:48 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:


Attachments
sudo acpidump -o acpidump.txt (352.82 KB, text/plain)
2019-06-23 20:50 UTC, Alexey Kuznetsov
Details
sudo fwts > fwts (51 bytes, text/plain)
2019-06-23 20:51 UTC, Alexey Kuznetsov
Details
sudo fwts method > fwts_method (49 bytes, text/plain)
2019-06-23 20:51 UTC, Alexey Kuznetsov
Details
sudo dmidecode > dmidecode.log (13.19 KB, text/x-log)
2019-06-23 20:52 UTC, Alexey Kuznetsov
Details
grep -r . /proc/acpi > acpi (834 bytes, text/plain)
2019-06-23 20:53 UTC, Alexey Kuznetsov
Details

Description Alexey Kuznetsov 2019-06-23 20:50:45 UTC
Created attachment 144616 [details]
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
Comment 1 Alexey Kuznetsov 2019-06-23 20:51:24 UTC
Created attachment 144617 [details]
sudo fwts > fwts
Comment 2 Alexey Kuznetsov 2019-06-23 20:51:43 UTC
Created attachment 144618 [details]
sudo fwts method > fwts_method
Comment 3 Alexey Kuznetsov 2019-06-23 20:52:09 UTC
Created attachment 144619 [details]
sudo dmidecode > dmidecode.log
Comment 4 Alexey Kuznetsov 2019-06-23 20:53:36 UTC
Created attachment 144620 [details]
grep -r . /proc/acpi > acpi
Comment 5 Alexey Kuznetsov 2019-06-23 20:54:45 UTC
PS: I do not remember, if it is ever worked.
Comment 6 Alexey Kuznetsov 2019-08-31 10:26:52 UTC
Interesting note. After suspend/resume it starts to work properly.
Comment 7 GitLab Migration User 2019-09-18 20:48:07 UTC
-- 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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