Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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: ?

enter image description here

share|improve this question

Don't know how to fix it, but do know how to work around making the screen worse when fixing it. Maybe the following will provide some clues as to how to find the culprit.

Here's my script for getting/setting the backlight value.

I also use KDE and have a slightly less annoying problem. Every time I come back from screensaver/screen off, the display is at brightness 1 (the lowest) which is not what I want.

I wrote the script, copied it into /usr/bin and added an icon to my taskbar to launch it. I use it multiple times a day. The command the icon runs is

kdesudo -- /usr/bin/backlight 5

and I added the line

bigbird ALL=NOPASSWD: /usr/bin/backlight

to /etc/sudoers so it doesn't ask for a password.

Script: http://dl.dropbox.com/u/54584985/backlight

I don't know how to do it, but if you can watch for who changes the "field" in /proc, maybe you'll be a step closer to finding the culprit.

share|improve this answer
Recently upgraded from Precise to Trusty. The bug with brightness levels not being restored when the screen turns on again appears to be fixed. – Joe Oct 7 '14 at 1:24

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.