The clamp_brightness function introduced with systemd-212 should be disabled for devices that resides in the LED subsystem (which are according to 99-systemd.rules.in are only keyboard backlights).
People that turn their kbd backlight off, usually want the same state after a reboot/service-restart.
Sorry for not attaching a PATCH-File at all, i'm not really a C developer)
Created attachment 96977 [details] [review]
execute clamp_brightness only for non LED devices
Related my prior comment with a patch.. i've created one, hope he is fine.
(In reply to comment #1)
> Created attachment 96977 [details] [review] [review]
> execute clamp_brightness only for non LED devices
> Related my prior comment with a patch.. i've created one, hope he is fine.
This patch looks reasonable to me.
I do wonder, though, if it might make more sense to whitelist only the subsystem used for display backlights, rather than blacklisting LED "backlights".
Fixed in git!