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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

Abishek VP
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  • I think this answer is well explained to solve your problem :
    [Brightness reset to maximum after reboot](https://askubuntu.com/a/151665/1266038)     – 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

1 Answers1

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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
Sooraj
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