passthejoe, 3 months ago

After I finally upgraded my 2011 iMac from Debian 11 to 12, I lost the ability to adjust the screen brightness in GNOME.

I traced the issue to the kernel. Screen brightness could be adjusted in the Debian 11 kernel (5.10.209) but not in the Debian 12 kernel (6.1.76).

I tried the Backports kernel (6.6.13) but that didn't work (though I need to try it again to be 100% sure because along the way I simplified my kernel parameters).

With the 6.7.11 kernel from Liquorix, it works perfectly.