I just got VL DELUXE (but I had same problem on 5.9 RC2-3) : When switching to battery mode, brightness is getting darker but my CPU frequency do not change. I set-up to load acpi on startup in VL hardware config.
I tried in Klaptop config to "setup helper configuration" and I get a prompt saying :
Klaptot Daemon : The usr/bin/klaptop_acpi_helper application does not seem to have the same size or checksum as when it was compiled we DO NOT recommand you proceed with making it setuid-root without further investigation.
I choose : Run nevertheless and everthing seems fine except that my CPU frequency is not managed.
Note that if i start my computer unplugged, the CPU frequency is set to 50%.
I tried to install kpowersave and everything works fine except CPU frequency mangement ("no cpu frequency management possible")
Note also that at Vector Linux start i got this prompt :
loading APM : failed
Any help will be much appreciated !