Laptop Screen Brightness is Fixed to 100% on kernel 5.9

Yes you have added it to right place. Looks like something different is going on in your case. Can you adjust your brightness on LTS kernel?

Sorry Im a newbie here. not sure what you meant

That’s OK. Open Manjaro Settings Manager and click on the creepy penguin icon that says Kernel. Then check which kernels are installed on your system. If the latest LTS kernel (which means Long Term Support) which should be 5.4.* is not installed, install it. Reboot and at the grub menu select second entry about manjaro (which is a submenu that lets you select other kernels to boot with), select LTS kernel you’ve installed and after it boots check if your screen brightness is working as expected. If it works and you want to stick with the LTS kernel you can remove 5.9 kernel same way you install LTS kernel or you can define LTS kernel as default in the grub configuration. I don’t remember the full process for it but I’m sure you can find it online with a quick search. If LTS kernel doesn’t solve your problem then it’s probably something different and I suggest you to open another thread for your issue

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Hi, thanks for helping.

I tried quiet apparmor=1 security=apparmor resume=UUID=6f1352f1-5ab6-41a5-8c20-1b3267bf0ae6 udev.log_priority=3 i915.enable_dpcd_backlight=0 with 5.4 and as well with 5.8

still no effect. But I gone ahead I added this to 5.8’s grub file it didnt break anything but no effect.

GRUB_CMDLINE_LINUX_DEFAULT="quiet apparmor=1 security=apparmor resume=UUID=6f1352f1-5ab6-41a5-8c20-1b3267bf0ae6 udev.log_priority=3 i915.enable_dpcd_backlight=0"

[UPDATE] Kernel 5.10 fixed this issue for me. I don’t need to set i915.enable_dpcd_backlight=0 anymore. Brightness control works as expected.

It is needed, because of the OLED patch added

Tried this for my Lenovo T460s and this works like a charm!

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