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#1 2023-11-12 15:25:19

hytew
Member
Registered: 2011-01-20
Posts: 27

[Solved]Failed to start... Screen Backlight Brightness of backlight:nv

Hello, today after doing my weekly `pacman -Syu` I'm seeing this error on boot load on my Laptop `ASUS ROG Zephyrus M16 - 16/165Hz/i7-12700H/16GB/512GB SSD/RTX3060`.

```
journalctl -b | grep Backlight
...
nov 12 15:37:40 daasus systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:nvidia_0...
nov 12 15:37:40 daasus systemd[1]: Starting Load/Save Screen Backlight Brightness of leds:asus::kbd_backlight...
nov 12 15:37:41 daasus systemd[1]: Finished Load/Save Screen Backlight Brightness of leds:asus::kbd_backlight.
nov 12 15:37:41 daasus systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0.
nov 12 15:37:41 daasus systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:nvidia_0...
nov 12 15:37:41 daasus systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0.
nov 12 15:37:41 daasus systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:nvidia_0...
nov 12 15:37:41 daasus systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0.
nov 12 15:37:41 daasus systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:nvidia_0...
nov 12 15:37:41 daasus systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0.
nov 12 15:37:41 daasus systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:nvidia_0...
nov 12 15:37:41 daasus systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0.
nov 12 15:37:41 daasus systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:nvidia_0.
```

From this moment the Fn Keys to change the backlight of the laptop doesn't have any effect, and the Laptop seems to be configured to 100% of the backlight.

I tested these solutions, but nothing works:

1. https://wiki.archlinux.org/title/backli … ne_options
2. https://forums.developer.nvidia.com/t/b … 070/235823
3. I changed from `linux + nvidia` to `linux-lts + nvidia-lts`

Someone experienced the same error last days?

Last edited by hytew (2023-12-26 13:14:22)

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#2 2023-11-14 03:02:55

Sbunz
Member
Registered: 2023-11-12
Posts: 3

Re: [Solved]Failed to start... Screen Backlight Brightness of backlight:nv

I have also been having this exact issue since the recent kernel update. I am on a Lenovo Legion 5 17IMH05H
I have attempted the same solutions and still my brightness is stuck at 100%

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#3 2023-11-14 13:43:51

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 22,387

Re: [Solved]Failed to start... Screen Backlight Brightness of backlight:nv

The 545 nvidia drivers broke backlight support, wait for an upgrade or downgrade to 535, see: https://forums.developer.nvidia.com/t/n … g/270139/1

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#4 2023-11-14 20:50:59

hytew
Member
Registered: 2011-01-20
Posts: 27

Re: [Solved]Failed to start... Screen Backlight Brightness of backlight:nv

Thank you a lot @V1del.

I downloaded the version 535 from https://archive.archlinux.org/packages/n/nvidia-lts/ and nvidia-utils from https://archive.archlinux.org/packages/n/nvidia-utils/.

Then installed by pacman -U nvidia-lts-1_535.113.01-7-x86_64.pkg.tar.zst nvidia-utils-535.113.01-2-x86_64.pkg.tar.zst

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#5 2023-11-14 22:57:00

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 22,387

Re: [Solved]Failed to start... Screen Backlight Brightness of backlight:nv

You probably want to opt for nvidia-dkms instead and install linux-lts-headers so the module can get rebuilt as new LTS versions arrive.

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#6 2023-11-15 17:42:31

hytew
Member
Registered: 2011-01-20
Posts: 27

Re: [Solved]Failed to start... Screen Backlight Brightness of backlight:nv

Thanks again Videl. Yes, it's better the dkms version to get the kernel auto-build with the correct nvidia version.

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#7 2023-11-20 10:15:36

Brainos
Member
Registered: 2023-06-22
Posts: 3

Re: [Solved]Failed to start... Screen Backlight Brightness of backlight:nv

Nvidia released a patch to fix this, see https://github.com/NVIDIA/open-gpu-kern … 1804213566

I opened a task in arch bug report https://bugs.archlinux.org/task/80299

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