Version: 4.6 (using KDE 4.6.0) OS: Linux My netbook's brightness down key works, brightness up doesn't. The keys are bound correctly and I can reverse them and I have the same problem, so it's not a key issue. I can adjust the brightness back up using the slider in the battery applet, so it's not a hardware issue. I've tried making a new home directory, and it did not solve the problem. Reproducible: Didn't try I'm using kubuntu 10.10 with kubuntu-ppa backports for kde 4.6. Problem was not present before the updates.
I now know exactly why this issue exists. Happens only when there are too few brightness levels available, for example, if your screen has 8 brightness levels (/sys/class/backlight/whatever/max_brightness = 7) as mine did, your brightness up key will not work. -- For Samsung netbook (NF310) users with samsung-backlight: Add "options samsung_backlight use_sabi=0 force=1 levels=100" to /etc/modprobe.d/modprobe.conf (create file if necessary)
This is probably a duplicate of bug 264534.
*** This bug has been marked as a duplicate of bug 264534 ***