[REGRESSION] No physical display brightness control on kernel 7.1.x

Device model: Google Pixelbook 2017 i7 (EVE)
OS: Fedora 44 KDE
Kernel: 7.1.4
Firmware: MrChromebox UEFI full ROM (https://docs.mrchromebox.tech/)

Hi. I'm experiencing an issue on the above system where adjusting
brightness values via the DE UI doesn't affect the physical brightness
of the display itself. The problem began following a recent system
update.

Admittedly, I haven't done the work myself to verify that this is a
kernel regression, though I believe it probable due to this forum
discussion: (https://forum.chrultrabook.com/t/2017-pixelbook-backlight-control-doesnt-work-with-7-1-kernel/8954),
the efforts of the OP in that discussion and the fact that I also own
a Kubuntu system running kernel 7.0.x without issue.