When I boot and about to login, the desktop is nice and ‘bright’.
2 seconds after I log in, the screen dims by about 20 %.
This is not a laptop. How can I stop the dimming ?
Thanks,
M....
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You should get a few more suggestions along with mine, But I simply use:
xset -dpms # Disables Energy features
xset s off # Disables screen saver
Note I don’t use a lot of GUI’s but there is also an option to set it Gnome in top right corner of your top panel.
Hi.
I tried:
xset -dpms & xset s off to no avail.
Someone suggested:
gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 100
Does this make any sense ?
Remember this is Ubuntu UNITY.
Thanks,
M…
It shouldn’t hurt but I suspect something else is at play. My list includes:
If you continue to experience issues, it may be necessary to check if there are any specific driver settings or BIOS configurations affecting the screen brightness and dimming behavior.
If the screen still dims after these steps, it might be due to the Power Saver mode being enabled, which overrides the Dim Screen setting. You can switch to a different power mode, such as Balanced, to prevent aggressive dimming.
For more detailed configuration, you can also modify the GRUB_CMDLINE_LINUX_DEFAULT setting in /etc/default/grub to include acpi_backlight=none and then update GRUB using update-grub.
sudo -i
gsettings set org.gnome.settings-daemon.plugins.power idle-brightness 100
xset -dpms
xset s off
Added the following to: /etc/default/grub`
GRUB_DISTRIBUTOR=‘Ubuntu’
GRUB_CMDLINE_LINUX_DEFAULT=‘quiet splash’
# Added the following line to stop screen dim May.2025
GRUB_CMDLINE_LINUX_DEFAULT=‘acpi_backlight=none’
GRUB_CMDLINE_LINUX=“”
sudo update-grub
Boot
Still dimming.
I can’t find anything applicable in the BIOS.
Where is this “Power Saver Mode” ?
Thank,
M…
“Power Saver Mode” can be accessed through the settings.
Specifically, you can find it under Settings → Power → Power Mode → Power Saver.
This mode is designed to reduce power consumption on your system, which is particularly useful when running on battery power. Your Not I’m clear on that.
This acts and smells like a hardware issue of some sort…
Also check this as a look first:
powerprofilesctl get
Mine is set @:
performance
If your on power saver mode you try to manually change it via:
powerprofilesctl set performance
Hi.
powerprofilesctl get showed ‘balanced’
I changed it to ‘performance’
powerprofilesctl set performance
This had no effect.
No biggy. I upped the Brightness setting on the Acer 36" monitor and the display is quite acceptable.
Thanks for your help, and have a nice day,
M…
Thanks for the update, please also see this:
https://help.ubuntu.com/stable/ubuntu-help/power-whydim.html.en
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