Brightness slider not working

General Help
1

Hello,

I have recently installed Zorin Core 18.1 on my Acer Aspire Nitro (with Nvdia GPU).
It's working like a charm, except the brightness controller (slider or keyboard) not working.

I have already tried some modification on the grub file (/etc/default/grub), from differents answers on forums, like so :

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.modeset=1 acpi_backlight=vendor acpi_osi="

However it does not work.

Also, some people talk about modyfing some config files in "etc/X11/xorg.conf.d" but there is no existing files here for me, so it's unclear to what I should do ? Create one ?

Would anyone have some ideas on this topic ?

Thanks !

1 Like
2

Did you test to boot with an older kernel? In grub menu select advanced options for Zorin, and then select kernel 6.17 (not a recovery kernel ) to boot from.

Some users reported that the kernel update to kernel 7.0 caused that problem.

2 Likes
3

Hello and welcome,

Try this

sudo nano /etc/default/grub

remove 'acpi_backlight=vendor acpi_osi=' from

GRUB_CMDLINE_LINUX_DEFAULT

add

i915.enable_dpcd_backlight=3

it must look like that

`GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dpcd_backlight=3"`

Then

sudo update-grub
sudo reboot
2 Likes
4

Welcome to the Forum!

Are Secure Boot and Fast Boot in BIOS disabled? If Windows is still installed: Is Fast Start-Up in Windows disabled? Does Your System run in Wayland or X11? You can check that with the Terminal Command echo $XDG_SESSION_TYPE

5

My eldest daughter had a similar problem on a Thinkpad T460. I guess this happened after an update recently (?)
I "solved" the problem by using an extension called AlphaTint
You can install "Extensions manager" from the software center and add extensions from it.
Use and manage extensions with caution :wink: