Screen brightness change does not automatically apply on laptop plug/unplug when configured (KDE Plasma)

I have an ASUS TUF Gaming A15 FA507NV laptop running CachyOS with KDE Plasma. Manual screen brightness change works perfectly fine - however, “On AC Power”/“On Battery” settings for it, as configured in KDE’s power management settings, do not apply when corresponding power events happen.

Other settings, such as power profile or a custom command, do work properly, it’s apparently just screen brightness that does not get applied. I’ve had this issue ever since I’ve installed CachyOS in December - FWIW, it did not happen on my previous EndeavorOS install.

You’re right, I can reproduce this too. It doesn’t seem to be the KDE packages tho, because I just switched to Arch’s (although beta) and it doesn’t work with these either. I’ve tried with linux-cachyos-lts and it didn’t work there too. Can you try linux and linux-lts?

Still happens both on linux and linux-lts kernels, unfortunately.

When was this BTW, if you still have some disk space to spare it would be nice if this problem isn’t a CachyOS issue, but I’ll try bisect this somehow if it is.

Just made a fresh (online) EOS install on a second currently unused SSD and screen brightness automatically changes there just fine… Also, the brightness menu has a slider for keyboard brightness control. diffed package lists, but nothing interesting came up other than lack of kgamma on Cachy - however, installing it changed nothing.

P.S.: will have to nuke EOS, sadly, as it’s messing with the boot order. Might put it on an SD card if more testing will be needed…

Thanks… I’ll try to figure out what’s going wrong.

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