Arch Linux

crimsoncandy

Member

Registered: 2020-03-26

Posts: 12

[SOLVED] Failed to start Load/Save Screen Backlight Brightness of

My laptop had backlight issue: Max brightness on every boot

/sys/class/backlight

only have one have

amdgpu_bl0

symlinked, so I added kernel parameter

acpi_backlight=amdgpu_bl0

, it solved the brightness reset issue but I still get error messages complaining about

Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video1

on boot.

Output of

systemctl status systemd-backlight@backlight:acpi_video1

● systemd-backlight@backlight:acpi_video1.service - Load/Save Screen Backlight Brightness of backlight:acpi_video1
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static; vendor preset: disabled)
     Active: failed (Result: exit-code) since Tue 2020-04-14 09:45:25 IST; 28min ago
       Docs: man:systemd-backlight@.service(8)
    Process: 540 ExecStart=/usr/lib/systemd/systemd-backlight load backlight:acpi_video1 (code=exited, status=1/FAILURE)
   Main PID: 540 (code=exited, status=1/FAILURE)

Apr 14 09:45:25 arch systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:acpi_video1...
Apr 14 09:45:25 arch systemd[1]: systemd-backlight@backlight:acpi_video1.service: Main process exited, code=exited, status=1/FAILURE
Apr 14 09:45:25 arch systemd[1]: systemd-backlight@backlight:acpi_video1.service: Failed with result 'exit-code'.
Apr 14 09:45:25 arch systemd[1]: Failed to start Load/Save Screen Backlight Brightness of backlight:acpi_video1.

Output of

journalctl -b _PID=540

-- Logs begin at Sun 2020-04-05 00:33:18 IST, end at Tue 2020-04-14 10:07:06 IST. --
Apr 14 09:45:25 arch systemd-backlight[540]: Failed to get backlight or LED device 'backlight:acpi_video1': No such device

I've tried disabling the service by

systemctl disable systemd-backlight@backlight:acpi_video1

but it didn't work.

Last edited by crimsoncandy (2020-04-15 04:46:29)

Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 9,003

Website

Re: [SOLVED] Failed to start Load/Save Screen Backlight Brightness of

Mask the unwanted backlight service. I'm sure that's in the ArchWiki.

---

Jin, Jîyan, Azadî

crimsoncandy

Member

Registered: 2020-03-26

Posts: 12

Re: [SOLVED] Failed to start Load/Save Screen Backlight Brightness of

Mask the unwanted backlight service. I'm sure that's in the ArchWiki.

Thanks! masking disabled the service. I should spend more time reading wiki..