On amy Asus V6V laptop I have installed KDE 3.4.0 (~x86). Each while and then I get an OSD (similar to the one I get to change the LCD brightness) saying "Display changed: LCD off". Nothing gets actually done (the LCD stays on!). But it is an annoying problem. The problems seems to be in the file kdeutils/kmilo/asus/asus.cpp. Gnome doesn't show this behaviour, so I argue is KDE specific. Reproducible: Sometimes Steps to Reproduce: 1. 2. 3.
It seems this is a known kde problem: https://bugs.kde.org/show_bug.cgi?id=102374