[SOLVED] Asus G16 unable to adjust brightness

eggsacc · 2025-04-28 16:17:53

Hi, i am using Arch with Hyprland, and it seems like I am unable to adjust my laptop screen brightness.

Laptop: Asus Zephyrus G16 2024 (Intel ultra 9 185h, rtx4070)
kernel: 6.14.4-arch1-1

I already tried brightnessctl, brillo etc, all of which does not work. The brightness of the laptop is either at 100% or 0%, any intermediate values does not make a difference.

I see that a lot of people also checked their /sys/class/backlight/intel_backlight, these are the files present for my laptop:
actual_brightness bl_power brightness device@ max_brightness power/ scale subsystem@ type uevent

I tried manually modifying the actual_brightness and brightness values, but again, no difference.

Please help, this is the hardest roadblock that is making me think of quitting linux

Last edited by eggsacc (2025-04-29 08:36:23)

jl2 · 2025-04-28 18:59:43

use [code][/code] tags to create code blocks.

what's the output of

cat /sys/class/backlight/intel_backlight/{max_brightness,brightness}

?

Does 'dmesg' (use 'dmesg -W' to wait for new error messages) report any new errors when you try changing it?

eggsacc · 2025-04-29 01:52:37

jl2 wrote:

use [code][/code] tags to create code blocks.

I see, thanks for advising. Was wondering why triple ` did not work.

I get the output

192000
9600

Running 'dmesg -W':

[ 5255.910151] nvidia-nvlink: Nvlink Core is being initialized, major device number 509

[ 5255.912358] nvidia 0000:01:00.0: Unable to change power state from D3cold to D0, device inaccessible
[ 5255.912709] nvidia 0000:01:00.0: vgaarb: VGA decodes changed: olddecodes=none,decodes=none:owns=none
[ 5255.912772] NVRM: The NVIDIA GPU 0000:01:00.0
               NVRM: (PCI ID: 10de:2860) installed in this system has
               NVRM: fallen off the bus and is not responding to commands.
[ 5255.912921] nvidia 0000:01:00.0: probe with driver nvidia failed with error -1
[ 5255.912956] NVRM: The NVIDIA probe routine failed for 1 device(s).
[ 5255.912959] NVRM: None of the NVIDIA devices were initialized.
[ 5255.913809] nvidia-nvlink: Unregistered Nvlink Core, major device number 509
[ 5256.783616] nvidia-nvlink: Nvlink Core is being initialized, major device number 509

[ 5256.786253] nvidia 0000:01:00.0: Unable to change power state from D3cold to D0, device inaccessible
[ 5256.786565] nvidia 0000:01:00.0: vgaarb: VGA decodes changed: olddecodes=none,decodes=none:owns=none
[ 5256.786620] NVRM: The NVIDIA GPU 0000:01:00.0
               NVRM: (PCI ID: 10de:2860) installed in this system has
               NVRM: fallen off the bus and is not responding to commands.
[ 5256.786731] nvidia 0000:01:00.0: probe with driver nvidia failed with error -1
[ 5256.786760] NVRM: The NVIDIA probe routine failed for 1 device(s).
[ 5256.786761] NVRM: None of the NVIDIA devices were initialized.
[ 5256.787112] nvidia-nvlink: Unregistered Nvlink Core, major device number 509

Also, I tried installing the nvidia drivers and got the problem

-> No AUR package found for lib32-libglvnd
 -> No AUR package found for lib32-zlib
 -> could not find all required packages: lib32-zlib 
could not find all required packages: lib32-libglvnd

I have multilib enabled, and checked that none of the mirrors are out of sync. I also updated all the packaged in pacman using '-Syu', but still get the error

error: target not found: lib32-libglvnd
error: target not found: lib32-zlib

So i am unable to install the nvidia drivers as of now. Is that the problem?

Last edited by eggsacc (2025-04-29 01:53:46)

jl2 · 2025-04-29 06:57:11

Yeah, bbs predates markdown by ages.

Wierd. 9600/192000 = 0.05 = 5%
So it's not stuck at 0%.

Does dmesg -W (you need to keep it running in a different terminal window) post anything new when you run this command?

echo 128000 | sudo tee /sys/class/backlight/intel_backlight/brightness

As for the nvidia issue, I can't help you there.
https://wiki.archlinux.org/title/NVIDIA

Last edited by jl2 (2025-04-29 06:59:09)

eggsacc · 2025-04-29 07:24:21

Sorry maybe it's the way I phrased it, but I have no trouble changing the brightness value, it's just that the display does not respond to the change. Like I can set the brightness at 5% but the physical screen is still fully bright. Only when I set the value to 0% then the display turns off, otherwise its just always full brightness.

Also the terminal running dmesg -W outputs nothing when the brightness value is modified.

And I figured out the nvidia driver, so that's not an issue anymore.

jl2 · 2025-04-29 07:30:09

https://www.reddit.com/r/ZephyrusG14/co … 16_thread/
https://www.ehmiiz.se/blog/linux_asus_g16_2024/

Googling stuff should be a eccential part of your research when fixing issues.
The later should contain a fix for the backlight, add this to your cmdline (steps for that depend on your bootloader):

nvidia-drm.modeset=1 i915.enable_dpcd_backlight=1 nvidia.NVreg_EnableBacklightHandler=0 nvidia.NVreg_RegistryDwords=EnableBrightnessControl=0

Last edited by jl2 (2025-04-29 07:36:15)

eggsacc · 2025-04-29 08:32:36

Holy, thanks so much. It worked after I followed the second link and added a few extra lines in systemd options.

I also installed asusctl following the first link, and is able to configure keyboard brightness now as well!

TLDR: 2024 G16 brightness adjustment not working
https://www.ehmiiz.se/blog/linux_asus_g16_2024/

1) Install Nvidia drivers & 'asusctl'
2) Sudo open kernel config files
For grub:

sudo nano /etc/default/grub

For systemd:

#(cd to '/boot/loader/entries' and use 'ls' to check the name of kernel config file)
sudo nano /boot/loader/entries/{file_name}.conf

3) Find the 'options=' line, and append the following behind:

quiet splash nvidia-drm.modeset=1 i915.enable_dpcd_backlight=1 nvidia.NVreg_EnableBacklightHandler=0 nvidia.NVreg_RegistryDwords=EnableBrightnessControl=0

4) Reboot

Last edited by eggsacc (2025-04-29 08:34:06)

Arch Linux

#1 2025-04-28 16:17:53

[SOLVED] Asus G16 unable to adjust brightness

#2 2025-04-28 18:59:43

Re: [SOLVED] Asus G16 unable to adjust brightness

#3 2025-04-29 01:52:37

Re: [SOLVED] Asus G16 unable to adjust brightness

#4 2025-04-29 06:57:11

Re: [SOLVED] Asus G16 unable to adjust brightness

#5 2025-04-29 07:24:21

Re: [SOLVED] Asus G16 unable to adjust brightness

#6 2025-04-29 07:30:09

Re: [SOLVED] Asus G16 unable to adjust brightness

#7 2025-04-29 08:32:36

Re: [SOLVED] Asus G16 unable to adjust brightness

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