Brightness Slider not working | Linux Mint Community🍵 | Page 1

cobalt meadow Nov 15, 2025, 10:47 PM

#

Hello, I'm currently having an issue on Linux Mint 22.2, and I'm really new to it so please have patience

Expected Behavior:

Brightness to drop to 0% when I slide it down to 0%,
Brightness to rise to 100% when I slide it up to 100%

Actual Behavior:

Actual Brightness doesn't drop to 0% when I slide it down to 0%, and is kept at seemingly 100% (The slider does show itself as 0%)

Additional Information:

I uploaded a screenshot of the info i got from putting inxi -Gxx into the terminal, although idk if there's anything else I need to show

tawny dragon Nov 15, 2025, 10:52 PM

#

some pc mobos have bad support for backlit stuff

#

show result of inxi -SM

cobalt meadow Nov 15, 2025, 10:53 PM

#

tawny dragon Nov 15, 2025, 10:55 PM

#

see #1430719682779942973 message thru to end. that's the only workaround I know.

cobalt meadow Nov 15, 2025, 10:56 PM

#

🫡

cobalt meadow Nov 15, 2025, 11:13 PM

#

do note i tried to use brightnessctl but this is what it came up with, and ofc nothing really happens

#

just in case this info helps for something

cobalt meadow Nov 17, 2025, 4:04 PM

#

xrandr --query | grep " connected"

eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm

#

xrandr --output eDP-1 --brightness 0.7

that works, however it's not compatible with Night Light

#

but I did manage to find a workaround this issue with brightnessctl

#

I had to modify some major settings i think (i. e. sudo nano /etc/default/grub)

tawny dragon Nov 17, 2025, 4:08 PM

#

cobalt meadow I had to modify some major settings i think (i. e. `sudo nano /etc/default/grub`...

would you mind doing more /etc/default/grub and sharing those changed settings?

cobalt meadow Nov 17, 2025, 4:09 PM

#

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
into
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video"

#

and that changed the brightnessctl

cobalt meadow Nov 17, 2025, 4:09 PM

#

cobalt meadow do note i tried to use brightnessctl but this is what it came up with, and ofc n...

from this

tawny dragon Nov 17, 2025, 4:09 PM

#

so now the nvidia thing changes it?

cobalt meadow Nov 17, 2025, 4:10 PM

#

to this

tawny dragon Nov 17, 2025, 4:10 PM

#

does the slider work?

cobalt meadow Nov 17, 2025, 4:10 PM

#

tawny dragon so now the nvidia thing changes it?

no idea what acpi is but don't think so

cobalt meadow Nov 17, 2025, 4:10 PM

#

tawny dragon does the slider work?

sadly not, i'm forced to use brightnessctl

#

it is compatible with Night Light however

tawny dragon Nov 17, 2025, 4:11 PM

#

you can still make 3 or 4 scripts like I linked with that command and keep them handily on desktop, or set to hotkeys

#

see if it works without needing sudo

cobalt meadow Nov 17, 2025, 4:14 PM

#

eh no worries i'm not that big with hotkeys, but nah sudo is needed, and it's a bit annoying having to type in the password everytime i open the terminal to modify the brightness, but at least it doesn't require me to type it in everytime i put in the command

#

and it requiring sudo might complicate the things with the scripts/hotkeys?

cobalt meadow Nov 17, 2025, 4:16 PM

#

cobalt meadow it is compatible with Night Light however

and yea it kinda sucks it has to be from the commands, and not from the slider, but oh well
i'm happy enough with this

#Brightness Slider not working