Arch Linux

uzuto

Member

Registered: 2022-12-04

Posts: 13

[SOLVED] Brightness 100% after waking from suspend.

My laptop's screen brightness turns full after waking up from suspend and the brightness control keys work and I get notified of my brightness changing but it does't change at all.

Output of "inxi -Faz" https://0x0.st/8rFN.txt
Output of "journalctl" after waking from suspend https://0x0.st/8rFb.txt
Output of "pacman -Qnq" https://0x0.st/8rFA.txt

A thing to note: I was having random freezes on my system past few days and i tried changing kernels, downgrading firmware but nothing worked, and somehow installing intel-ucode seems to have fixed it, but I'm not entirely sure.

SOLVED: Kernel 6.12.7 has fixed this issue.

Last edited by uzuto (2024-12-28 21:10:18)

Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 8,739

Website

Re: [SOLVED] Brightness 100% after waking from suspend.

installing intel-ucode seems to have fixed it

The µcode fixes are necessary for some processors. They fall over otherwise, as you have discovered.

For your backlight issues please share which desktop you're using. A full journal might be more useful than the excerpt you've shared already, there may be important context before the suspend operation.

Last edited by Head_on_a_Stick (2024-12-26 15:36:47)

---

Para todos todo, para nosotros nada

uzuto

Member

Registered: 2022-12-04

Posts: 13

Re: [SOLVED] Brightness 100% after waking from suspend.

Thanks for the reply @Head_on_a_Stick
I'm using bspwm with xfce4-power-manager managing all the concerned hardware
and yeah systemd-backlight@backlight:amdgpu_bl1.service is indeed active although I don't know what "exited" means. You can see more here http://0x0.st/8rF_.txt

Here's the output of "journalctl -xeb"  http://0x0.st/8rFO.txt

Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 8,739

Website

Re: [SOLVED] Brightness 100% after waking from suspend.

Compare the content of /sys/class/backlight/ before and after suspending. Do one of the directories disappear?

If so then try one of these kernel parameters: https://wiki.archlinux.org/title/Backli … ne_options

---

Para todos todo, para nosotros nada

uzuto

Member

Registered: 2022-12-04

Posts: 13

Re: [SOLVED] Brightness 100% after waking from suspend.

Compare the content of /sys/class/backlight/ before and after suspending. Do one of the directories disappear?

If so then try one of these kernel parameters: https://wiki.archlinux.org/title/Backli … ne_options

No, there is no change in directory structure of /sys/class/backlight.

I tried the 3 parameters and nothing worked as expected

acpi_backlight=video - turned off brightness control completely, one thing to note, amdgpu_bl1 was replaced by acpi_video0

acpi_backlight=vendor - No backlight controller found

acpi_backlight=native - Same as default, 100% brightness after suspend.

iamtrazy

Member

Registered: 2021-06-21

Posts: 2

Re: [SOLVED] Brightness 100% after waking from suspend.

Having the same issue. im also using the amdgpu driver

uzuto

Member

Registered: 2022-12-04

Posts: 13

Re: [SOLVED] Brightness 100% after waking from suspend.

Having the same issue. im also using the amdgpu driver

Since when have you been experiencing this issue?

Head_on_a_Stick

Member

From: The Wirral

Registered: 2014-02-20

Posts: 8,739

Website

Re: [SOLVED] Brightness 100% after waking from suspend.

Does the linux-lts package help?

---

Para todos todo, para nosotros nada

uzuto

Member

Registered: 2022-12-04

Posts: 13

Re: [SOLVED] Brightness 100% after waking from suspend.

Does the linux-lts package help?

No, lts didn't help, I even tried even downgrading the vanilla kernel.
Afaik, the kernel has nothing to do with this as I tried archcraft iso (Released in Oct) and it had no issues so, I downgraded my kernel to match the ISOs but it still didn't go as expected.

Last edited by uzuto (2024-12-27 14:16:11)

seth

Member

Registered: 2012-09-03

Posts: 60,815

Re: [SOLVED] Brightness 100% after waking from suspend.

https://bbs.archlinux.org/viewtopic.php … 0#p2216820 ?

---

How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

uzuto

Member

Registered: 2022-12-04

Posts: 13

Re: [SOLVED] Brightness 100% after waking from suspend.

It was indeed a kernel problem.

As posted by @greenfoo in https://bbs.archlinux.org/viewtopic.php?id=302066
Reverting to 6.12.4 fixed the issue for me, will test with 6.12.7

EDIT: 6.12.7 has fixed this issue.

Thanks guys.

Last edited by uzuto (2024-12-27 18:28:50)