I created FvwmPerl scripts for monitoring battery status, audio volume level, and screen brightness level. They are posted at:
They are free, relatively simple, and adaptable.
My laptop & netbook are not new & powerful. In order to realize a few more cycles that I can use instead of being wasted maintaining an “environment” I don’t need, I replaced Ubuntu/Kubuntu with my much favored Slackware & FVWM. My old hardware feels much more responsive now. Heck, I may get another 7 useful years out of my laptop…
[Edit] Apologies - this should have been posted to “Other Languages”.