Framework Laptop 13 Brightness Control Not Working

Framework Laptop 13 Linux
1

I’m running Linux Mint 21.3 with kernel 6.8.0 on a Framework Laptop 13 with the AMD Ryzen AI 7 340 and the 2.8K display.

The amdgpu driver is loaded correctly (confirmed via lspci and lsmod), but /sys/class/backlight is empty unless I use acpi_backlight=video, which exposes a non-functional ACPI interface (slider shows up but does nothing).

Things I’ve tried:

  • amdgpu.backlight=0 → exposes ACPI backlight (doesn’t work)
  • amdgpu.backlight=1 → no /sys/class/backlight entry at all
  • ACPI does not expose video or backlight devices
  • xrandr gamma adjustment works (software workaround)

What am I missing?

Any advice is welcome.

2

You need a newer kernel and probably are missing the GPU firmware. Basically pick a more modern distro.

Strix and Kraken support happened upstream in 6.9 iirc.

1 Like
3

I tried updating my kernel to 6.11, but the brightness control still doesn’t work.

4

Share your dmesg please.

5

Here’s the full output

6

I don’t see amdgpu loaded. You’re probably missing one of the extra kernel packages Ubuntu splits things into.