Someone had tested on 20.04 before and it did reset too.
Similar issue.
https://askubuntu.com/questions/1233030/nvidia-settings-reset-randomly
https://askubuntu.com/questions/1241645/nvidia-settings-reset-when-playing-video
There is possible gsd.power.manager check for blacklight but it was set
by nvidia thus it get reset when value null.
/* Fetch the current target brightness (not the actual display brightness)
* and return if it is already lower than the idle percentage. */
gsd_backlight_get_brightness (manager->backlight, &brightness);
if (brightness < idle_percentage)
https://gitlab.gnome.org/starnight/gnome-settings-
daemon/blob/c64c243e345cb92ed0c197a377767bcbf1704c1b/plugins/power/gsd-
power-manager.c
Or there is possible conflict on gsd.power on wayland with x11.
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https://bugs.launchpad.net/bugs/1892094
Title:
Xrandr brightness and gamma settings not remembered on power resume
Status in mutter package in Ubuntu:
Incomplete
Status in nvidia-graphics-drivers-440 package in Ubuntu:
Incomplete
Bug description:
Brightness Reset to Maximum on Nvidia GPU Desktop when setting on
Blank Screen
The Desktop LED Monitor brightness or Gamma level is not preserved and
reset when I set gnome-control-center setting on Power to Blank
Screen.
I try to post as much details as possible.
-I did a test by setting Nvidia X Server Color Correction and set any
brightness and gamma.It get reset when Power Saving Blank Screen time
active which I had set 10 minutes to save power by auto turning off
the display.
-The second test was by installing a Brightness Controller which use
Xrandr but same result of getting reset when I set Blank Screen.I also
manually set xrandr --output DVI-D-0 –brightness 0.5 --gamma
0.5:0.5:0.5 an value get reset after the trigger from blank screen.
-Third test by selecting Nouveau open source but same result of
getting reset when I set Blank Screen.
-Forth test , manually turn off the monitor ‘xset dpms force off’ it
doesn’t trigger the brightness reset.
Since the system is using Desktop GPU , the folder on xblacklight is
empty without config files.
The flow
> Set brightness > Power Saving Blank Screen time active > Brightness reset
> External Monitor dim and Turn Off > Press any keyboard button to wakeup the
display > Brightness Stay at reset value of Full 100% brightness.
The details I had tested , I suspect gsd-power may have related to this
issue.This is happen before which I had find a solution to other brightness
reset happen when every restart , delete a files upon restart , open a web
browser with and play a video stream, login and logout , suspend and Power
Saving Blank Screen.
All of this are affected by gsd-color.Which I had found a link a fix
suggestion
https://github.com/LordAmit/Brightness/issues/102#issuecomment-374253884 by
disable /usr/lib/gnome-settings-daemon/gsd-color on startup.
The only left is Power Saving Blank Screen still get reset when it get
active.I am not too sure whether it is related to gsd-power , I did disable it
but it also disable Power Saving Blank Screen together.
It just goes to screensaver mode and did not turn off the monitor.
I do not have any basic on gsd-power code
https://gitlab.gnome.org/starnight/gnome-settings-
daemon/blob/c64c243e345cb92ed0c197a377767bcbf1704c1b/plugins/power
/gsd-power-manager.c Not knowing which line did it callback and get
reset , presumably ‘GSD_POWER_IDLE_MODE_BLANK’ ?
Fresh Install
OS : Ubuntu 18.04.4
Architecture: amd64
Nvidia : GTX 1050
Driver : NVIDIA Driver Version: 440.100
uname : 5.4.0-42-generic
DisplayManager: gdm3
Journalctl log when blank screen active.
nvidia-settings[19556]: PRIME: is it supported? no
nvidia-settings[19556]: PRIME: No offloading required. Abort
nvidia-settings[19556]: g_object_unref: assertion 'G_IS_OBJECT (object)'
failed
Check that logind is properly installed and pam_systemd is getting used at
login.
gnome-session[1521]: gnome-session-binary[1521]: WARNING: Could not get
session path for session. Check that logind is properly installed and
pam_systemd is getting used at login.
gnome-screensav[1551]: Source ID 19140 was not found when attempting to
remove it
gnome-session-binary[1521]: WARNING: Could not get session path for session.
Check that logind is properly installed and pam_systemd is getting used at
login.
gnome-session[1521]: gnome-session-binary[1521]: WARNING: Could not get
session path for session. Check that logind is properly installed and
pam_systemd is getting used at login.
Reading the log shows somewhere it trigger brightness reset.The Nvidia
Setting prime message is show because I am using a desktop dedicated
GPU without using nvidia prime for laptop check to switching between
build in intel gpu and nvidia.
In which way I could fix brightness reset when I need to set Blank
Screen to turn off the monitor to save power ?
I did another test by manually turn off the monitor ‘xset dpms force
off’ it doesn’t trigger the brightness reset.It only happen when it is
set with a timer at setting blank screen to 1-15 minutes and which it
call for a PID which unknown and I assume gsd-power that trigger the
reset.
The most I can find is the gsd-power code
https://gitlab.gnome.org/starnight/gnome-settings-
daemon/blob/c64c243e345cb92ed0c197a377767bcbf1704c1b/plugins/power
/gsd-power-manager.c .I am nor expert on daemon.service pin point the
trigger.
I did a search at askubuntu , ubuntu forum and ask around at ubuntu irc
channel but did not get any similar result.
Either it happen in my system or it happen to everyone using Nvidia dedicated
GPU on desktop.I may need someone who using them willing to help on testing out
whether it happen on everyone.
Any solution to fix brightness reset but retain power saving on
monitor turn off automatically with blank screen ?
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