Arch Linux

mistgc

Member

From: Chengdu Sichuan China

Registered: 2022-04-12

Posts: 6

Website

The brightness decrease to 4 after unplugging

When the laptop is unplugged, the backlight brightness will reduce to 4.
And I have to execute

echo 60 > /sys/class/backlight/amdgpu_bl0/brightness

OS: Linux ArchLinux 5.19.3-arch1-1 #1 SMP PREEMPT_DYNAMIC Sun, 21 Aug 2022 18:55:22 +0000 x86_64 GNU/Linux
WM: dwm

● systemd-backlight@backlight:acpi_video0.service - Load/Save Screen Backlight Brightness of backlight:acpi_video0
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static)
     Active: active (exited) since Fri 2022-08-26 16:47:08 CST; 25min ago
       Docs: man:systemd-backlight@.service(8)
    Process: 582 ExecStart=/usr/lib/systemd/systemd-backlight load backlight:acpi_video0 (code=exited, status=0/SUCC>
   Main PID: 582 (code=exited, status=0/SUCCESS)
        CPU: 2ms

● systemd-backlight@backlight:amdgpu_bl0.service - Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0
     Loaded: loaded (/usr/lib/systemd/system/systemd-backlight@.service; static)
     Active: active (exited) since Fri 2022-08-26 16:47:08 CST; 25min ago
       Docs: man:systemd-backlight@.service(8)
    Process: 583 ExecStart=/usr/lib/systemd/systemd-backlight load backlight:amdgpu_bl0 (code=exited, status=0/SUCCE>
   Main PID: 583 (code=exited, status=0/SUCCESS)
        CPU: 3ms

ewaller

Administrator

From: Pasadena, CA

Registered: 2009-07-13

Posts: 20,601

Re: The brightness decrease to 4 after unplugging

Is there a question in there?  I assume you are asking why does the brightness change.
What desktop environment are you using?  Gnome? Plasma?

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mistgc

Member

From: Chengdu Sichuan China

Registered: 2022-04-12

Posts: 6

Website

Re: The brightness decrease to 4 after unplugging

Is there a question in there?  I assume you are asking why does the brightness change.
What desktop environment are you using?  Gnome? Plasma?

Hello. I don't use the DE. I am using the Windows Manager dwm.

Then, I want to keep the brightness the same after unplugging, or change the brightness to 40.

Last edited by mistgc (2022-08-26 15:15:41)