6.1.4 Kernel and Screen brightness problem

General system Kernel, boot, graphics & hardware
1

Hi,

First of all I’m Linux newbie so excuse me for any mistake or dumb question I may make.

Question:
Does anyone have problems with maxed out screen brightness (on laptop) since 6.1.4 update?

Explanation:
Since update to 6.1.4, my brightness slider has disappeared from the power manager applet and “/sys/class/backlight/” is empty.
Downgrading to 6.1.3 returned brightness slider and “/sys/class/backlight/” now has “intel_backlight” folder (as it should).

Problem was noticed on HP EliteBook 8460p with Intel HD3000 running Endeavouros XFCE.

2

can you try with option native ?
see this https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.1.4
about backlight change & acpi video

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3

I could swear to god that I already tried all four (native ,vendor ,video and none), but it seems that i didn’t.

Setting acpi_backlight to native, got brightness control back on 6.1.4.

4

Do you add this to kernel boot parameters?

Something like acpi_backlight=native?

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5

Yes, in /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=native"

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6

Great, thanks for the info!
It’s good to know in case …
Also glad you got it resolved!

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7

I hadn’t noticed this until I read this topic.
The slider is still there but it doesn’t do anything any more. Nor do the brightness buttons on the keyboard.
Hmm, have to make these changes as well.

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8

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