intel_backlight not working after update to kernel 5.15 from 5.10

After updating from kernel 5.10 to 5.15 (Archlinux), my backlight stopped working correctly. I cannot regulate it appropriately, as for any value above 0 it stays at 100% brightness, and at 0 it turns off.

I have verified that only intel_backlight is present under /sys/class/backlight both before and after the kernel update. I see that the values are actually written to the /sys/class/backlight/intel_backlight/brightness file, but it has no effect on the actual brightness after the update.

The machine I am using is a laptop XMG Core 15 e21 (Tongfang motherboard), with an intel 10870h and a WQHD 165hz panel running on it via eDP.

$ uname -a
Linux iamyoubutstronger 5.15.13-1-lts #1 SMP Mon, 10 Jan 2022 18:34:15 +0000 x86_64 GNU/Linux

In the dmesg, I made sure to include a section where the brightness change gets triggered

dmesg dmidecode