after the timeout, the powersave the screen got blank, including the screen's LED switching to "no signal". woke up the screen, after a while the screen started to get black again. interrupted this, but now the screen stayed black -- cursor changed while moving according to the now invisible windows it crossed, but nothing else happened. switched to console and back, which usually fixed those rendering issues, but that didn't help either. finally i killed kwin_x11and was at least able to close my open applications and logout in an orderly fashion. graphics adaptor: Advanced Micro Devices, Inc. [AMD/ATI] Cedar [Radeon HD 5000/6000/7350/8350 Series] (prog-if 00 [VGA controller]) Subsystem: Dell Radeon HD 6350 with : xserver-xorg-video-radeon Version: 1:7.7.0-1 Reproducible: Didn't try
Please try to suspend the compositor (SHIFT+Alt+F12) when this happens and also (just right now, no error condition required) attach the output of "qdbus org.kde.KWin /KWin supportInformation"
Created attachment 100147 [details] output of qdbus org.kde.KWin /KWin supportInformation
You are using xrender compositing. Is that wanted? Can you try whether using OpenGL works better?
xrender is just a remnant of the various attempts to minmize the constant plasmashell crashes. since there's apparently no documentation whatsoever: what are the differences and why would OpenGL be better?
Is the issue still actual for you?
User hasn't responded to request to confirm issue still exists.