Hmm... that's interesting. I've noticed that I see the same behavior when I used the 5.5 kernel distributed as a .deb for danielt's Debian stuff, which suggests that this is a change between 5.4 and 5.5.
I'm not sure whether this change is considered a "bug" or a "feature", but I will say that it kinda sucks that this upgrade changes things from "I don't ever need to have a screen-brightness applet" to "my system is not usable until I find a screen-brightness applet". (or just downgrade back to the older kernel, which is what I'm doing for the interim)
As it happens, I don't use a desktop environment (I use the fvwm window manager), so the "find a screen-brightness applet" issue is not quite as simple as "go to the control panel".
The manjaro forum thread indirectly pointed to by wdt has some interesting ideas for my no-desktop-environment situation.
I'm not sure whether this change is considered a "bug" or a "feature", but I will say that it kinda sucks that this upgrade changes things from "I don't ever need to have a screen-brightness applet" to "my system is not usable until I find a screen-brightness applet". (or just downgrade back to the older kernel, which is what I'm doing for the interim)
As it happens, I don't use a desktop environment (I use the fvwm window manager), so the "find a screen-brightness applet" issue is not quite as simple as "go to the control panel".
The manjaro forum thread indirectly pointed to by wdt has some interesting ideas for my no-desktop-environment situation.