It seems there's some bug in KDE related to power management and after putting my netbook to sleep several times, plugging it in and out, the notification about screen brightness set to 100% doesn't want to vanish (and as I modify brightness through keys, another one spawns right on top of the previous one, both half-transparent, two sets of numbers).
Now, I could just kill the superfluous process if I ever knew how it's named. The notification, being an overlay, is "transparent" to 'xwininfo' and the likes. There's a tad too many processes I don't know to start killing by trial and error. Sure restarting X would help but I'd like to get by without reopening my sessions in everything I have open. Once I know what to kill/restart I should be able to solve it (and if I can't restart it, so be it, better no brightness indicator than one stuck!)
So, what's the name of the process that displays this: ?