Brightness goes to max after every boot ubuntu 20.04

Question

I can control the brightness when i'm working on the OS but during startup it always resets to maximum brightness. Can anyone please provide me with a solution so that my past brightness preference is automatically saved for next boot. I'm using Ubuntu 20.04 on Acer swift 3, Ryzen 5 varient

EDIT : Output for sudo lshw -class display

*-display
description: VGA compatible controller product: Renoir vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:03:00.0 version: c3 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi msix vga_controller bus_master cap_list configuration: driver=amdgpu latency=0 resources: irq:47 memory:b0000000-bfffffff memory:c0000000-c01fffff ioport:1000(size=256) memory:c0600000-c067ffff

I think this answer is well explained to solve your problem :
Brightness reset to maximum after reboot — 1nfern0, May 22 '21 at 08:51
@1nfern0 that will depend on the graphical card in use. We do not have that information. Add the output of sudo lshw -class display to the post. — vanadium, May 22 '21 at 08:53

score 0 · Answer 1 · answered Aug 18 '21 at 16:19

0

I had the same problem and this is what I did.

To find current brightness level:

cat /sys/class/backlight/amdgpu_bl0/brightness

Set the brightness on boot using:

echo 30 > /sys/class/backlight/amdgpu_bl0/brightness

answered Aug 18 '21 at 16:19

Sooraj

101

1

It says permission denied for me.....dunno what to do .....if u know pls do let me know .....thanks for answering anyways!! – Abishek VP Aug 20 '21 at 06:36
use "sudo su" to login as root and execute. – Sooraj Aug 26 '21 at 09:22
1

tried it....still didn't work :( – Abishek VP Aug 27 '21 at 14:51

Brightness goes to max after every boot ubuntu 20.04

1 Answers1