*** This bug is a duplicate of bug 1885087 ***
https://bugs.launchpad.net/bugs/1885087
** This bug has been marked a duplicate of bug 1885087
Can't keep brightness value after reboot/poweroff in some nvidia gfx
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@ayush-akarsh try this command to get and set backlight. Works for me on
nvidia.
xbacklight -get
xbacklight -set 40
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https://bugs.launchpad.net/bugs/1840592
I have a nvidia 1650 graphic card on my legion-Y540 with ubuntu 20.04
I had fixed my brightness issue(Function keys not working) by adding Option
"RegistryDwords" "EnableBrightnessControl=1" in the device section of
/etc/x11/xorg.conf
It worked perfectly well until a software update, then now
Has anybody checked how other distros operate this? Maybe Debian/Kali?
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https://bugs.launchpad.net/bugs/1840592
Title:
systemd-backlight does not save and
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: nvidia-settings (Ubuntu)
Status: New => Confirmed
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: nvidia-graphics-drivers (Ubuntu)
Status: New => Confirmed
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: systemd (Ubuntu)
Status: New => Confirmed
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: nvidia-graphics-drivers-418 (Ubuntu)
Status: New => Confirmed
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And it's an issue with 20.04 daily builds.
Hardware is Lenovo P73 with NVIDIA RTX-5000 Q-Max.
So how can the driver be made to register the backlight device?
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Well, apparently Nvidia driver doesn't do that.
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https://bugs.launchpad.net/bugs/1840592
Title:
systemd-backlight does not save and restore brightness for nvidia
The backlight device only gets registered after it's opened by graphical
session.
And the backlight gets unregistered when graphical session stops, hence
when systemd-backight@.service's "Conflicts=shutdown.target" triggers,
the backlight is already gone so the brightness wasn't saved.
Since
systemctl list-units --no-pager |grep "systemd-backlight"
systemd-backlight@backlight:acpi_video0.service
loaded active exitedLoad/Save Screen
Backlight Brightness of backlight:acpi_video0
The notebook has 2 gpus, one is from the intel cpu and another is nvidia
which can be enabled or disable on bios on section "MSI VGA MODE" and
choose "MSI IGPU MODE" or "MSI DGPU MODE"
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** Summary changed:
- systemd-backlight does not save brightness for nvidia display
+ systemd-backlight does not save and restore brightness for nvidia display
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