Brightness stopped working in Fedora Asahi Remix (GNOME)

[runxiyu]

On 6.12.1-404.asahi.fc41.aarch64+16k:

[ 1295.352042] apple-dcp 231c00000.dcp: RTKit: syslog message: BrightnessLCD.cpp:803: [AFK]nitsToDBV: iDAC out of range

This looks like the Sequoia regression, but it's far past that time. Setting /sys/class/backlight/*/brightness to 1 causes my screen's contrast to change, but the actual backlight brightness has not.

I ran a full dnf update just now, still no luck.

[jannau]

Please report the used device. 231c00000.dcp is an M1 or M2 device (no Pro or Max). Does the brightness control work after closing the lid or DPMS off?

[jannau]

from #asahi@oftc.net:

huh, i'll look into it in detail after school, for now it works after closing and re-opening the lid

[runxiyu]

It's a M1 MacBook Air (2020)

[runxiyu]

Update: It seems that I could also reproduce this under sway. Brightness is not adjustable before the first time I close/open the lid.

[jannau]

What does tr '\0' '\n' < /proc/device-tree/chosen/asahi,m1n1-stage2-version report?

[runxiyu]

v1.4.17

[jvoisin]

I can't reproduce on the current Asahi.

[allmazz]

Can't reproduce on M2 Max 14"

[runxiyu]

I am unable to reproduce on current asahi too. I think this is solved.

[jannau]

closing with unknown cuase and fix