Problem with brightness level


I’m having weird problem with setting the screen brightness level.

Setting it anywhere between 0 and 40% doesn’t affect brightness at all, above 40% it gets progressively brighter until it hits 100% then screen gets completely black,zero light.

I’m not sure when problem exactly appeared.

I already tried:

  • Changing "/sys/class/backlight/intel_backlight/brightness" value manually, had the same effect as using slider.
  • Downgrading kernel to 6.2.9 and mesa to 23.0.1-2, that did nothing.
  • Changing "acpi_backlight" from "native" to "vendor" and "video", "vendor" did nothing, "video" fixed black screen at max level but still had that weird “no effect” zone between 0 and 40%.

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