Arch Linux

Arunkumar V

Member

Registered: 2025-01-13

Posts: 4

Nvidia Brightness control not working

Hi In  my Dell g15 with Amd 6800h cpu and Nvidia 3060 gpu the brightness controls are not working  can you help me ?
the brightness slider goes back and forth but no change in actual brightness .

Using Dual boot system brightness control works fine on windows

My settings

NVIDIA-SMI 565.77                 Driver Version: 565.77         CUDA Version: 12.7   

# GRUB boot loader configuration

GRUB_DEFAULT="0"
GRUB_TIMEOUT="20"
GRUB_DISTRIBUTOR="Arch"
GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3  nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1"

[Arun@archlinux default]$ ls /sys/class/backlight/
nvidia_wmi_ec_backlight
[Arun@archlinux default]$

[Arun@archlinux default]$ sudo tee /sys/class/backlight/nvidia_wmi_ec_backlight/brightness <<< "127"
[sudo] password for Arun:
127
[Arun@archlinux default]$ sudo tee /sys/class/backlight/nvidia_wmi_ec_backlight/brightness <<< "55"
55
[Arun@archlinux default]$

But no chagne in actual brughtness

[Arun@archlinux default]$ light -L
Listing device targets:
    sysfs/backlight/nvidia_wmi_ec_backlight
    sysfs/backlight/auto
    sysfs/leds/enp3s0-1::lan
    sysfs/leds/input6::numlock
    sysfs/leds/platform::mute
    sysfs/leds/input6::kana
    sysfs/leds/input2::numlock
    sysfs/leds/enp3s0-0::lan
    sysfs/leds/input2::capslock
    sysfs/leds/input6::scrolllock
    sysfs/leds/input2::scrolllock
    sysfs/leds/input6::compose
    sysfs/leds/alienware::global_brightness
    sysfs/leds/enp3s0-3::lan
    sysfs/leds/enp3s0-2::lan
    sysfs/leds/input6::capslock
    sysfs/leds/platform::micmute
    util/test/dryrun
[Arun@archlinux default]$ light -s sysfs/backlight/nvidia_wmi_ec_backlight -S 50
[Arun@archlinux default]$ light -s sysfs/backlight/nvidia_wmi_ec_backlight -S 100
[Arun@archlinux default]$

No Change

run@archlinux ~]$ light -G
49.80
[Arun@archlinux ~]$ light -S 50
[Arun@archlinux ~]$ light -S 20
[Arun@archlinux ~]$ light -G
20.00

mackin_cheese

Member

Registered: 2025-01-07

Posts: 477

Re: Nvidia Brightness control not working

can you post your output of

 pacman -Qm 

Arunkumar V

Member

Registered: 2025-01-13

Posts: 4

Re: Nvidia Brightness control not working

[Arun@archlinux ~]$ pacman -Qm
light 1.2.2-5
light-debug 1.2.2-5
yay 12.4.2-1
yay-debug 12.4.2-1
[Arun@archlinux ~]$

mackin_cheese

Member

Registered: 2025-01-07

Posts: 477

Re: Nvidia Brightness control not working

What research have you done so far regarding this issue?

Arunkumar V

Member

Registered: 2025-01-13

Posts: 4

Re: Nvidia Brightness control not working

What research have you done so far regarding this issue?

I have metioned it in my first post tried almost all the patches in youtube and forums

Even changing gamma values using xandr gets reverted if turning on gnome night light

mackin_cheese

Member

Registered: 2025-01-07

Posts: 477

Re: Nvidia Brightness control not working

alright well 3 things here:

1. Light is not a supported package. If you have any issues with an AUR provided package you're pretty much on your own.
2. Research should have brought you to this page: https://wiki.archlinux.org/title/Backlight   that page will give you all you need to know about backlights, both supported and not supported.
3. Research should have also told you that:

The GitHub page for light states: This project is considered orphaned since the 8th of March, 2023. Use is heavily discouraged until such a time that it is adopted by another developer.

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,623

Re: Nvidia Brightness control not working

1. Light is not a supported package. If you have any issues with an AUR provided package you're pretty much on your own.

No exactly true.  One can ask here : https://bbs.archlinux.org/viewforum.php?id=38
Or you can find the package here https://aur.archlinux.org/ and communicate with the packager and other users.

---

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The shortest way to ruin a country is to give power to demagogues.— Dionysius of Halicarnassus
---
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V1del

Forum Moderator

Registered: 2012-10-16

Posts: 25,156

Re: Nvidia Brightness control not working

You accidentally hit report instead of reply:

    Yeah tried every package in The brightness page in wiki
The NVIDIA page for brightness was flagged as outdated.

Generally speaking you shouldn't need the brightness parameter on modern nvidia drivers, it will be enabled by default. That said, how sure are you your display is driven by the nvidia card and not an integrated amdgpu? or is that disabled in UEFI/BIOS?

Arunkumar V

Member

Registered: 2025-01-13

Posts: 4

Re: Nvidia Brightness control not working

You accidentally hit report instead of reply:

    Yeah tried every package in The brightness page in wiki
The NVIDIA page for brightness was flagged as outdated.

Generally speaking you shouldn't need the brightness parameter on modern nvidia drivers, it will be enabled by default. That said, how sure are you your display is driven by the nvidia card and not an integrated amdgpu? or is that disabled in UEFI/BIOS?

Sorry for hitting report ..by mistake
[Arun@archlinux default]$ ls /sys/class/backlight/
nvidia_wmi_ec_backlight

using this confirmed that only nvidia

is there amd driver for it ? (like intel_backlight )

vanshanium

Member

Registered: 2025-06-29

Posts: 1

Re: Nvidia Brightness control not working

I had the same sort of configuration on my Laptop, it was for Nvidea 3050.
I appended this option `acpi_backlight=native` in the GRUB.

GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 quiet nvidia.NVreg_RegistryDwords=EnableBrightnessControl=1 acpi_backlight=native"

And It works fine now.