On Freitag, 2. Oktober 2015 12:59:30 CEST, Christopher Barry wrote:
Problem:
"Graphics stuff" seems to work smoothly on lower resolutions (e.g. 2x
2560x1600). On high resolution (2x 3840x2160) still everything
(moving/resizing windows, playing videos, scrolling through lists,
text views or consoles, opening menus) goes smoothly but only as long
as single windows are really small (and as long as there are not too
many of them). As soon as a window becomes half the size of a screen
or even full screen, operations mentioned before become horribly slow
(K-Menu takes up to 8 secs to even open up) and CPU usage of the Xorg
process is vastly increasing (to about 100%). I don't really have an
idea of what's going wrong here. There are no apparent errors etc.
The only thing that seems really suspect to me is the 100% CPU which I
would attribute to a (multi-)threading issue... I'd really appreciate
if you could give me a hand and point me to the right direction to get
things working.
You're likely running into texture/shader limitations and fallover to some
software emulation - the GPU is indeed not fully suited for such resolutions.
=> suspend the compositor (SHIFT+Alt+F12, no shadows, no translucency) or use the
XRender backend (kcmshell[4] kwincompositing")
*Maybe* even disabling the blur filter and setting the scale method to anything but
"accurate" (ie. try smooth) might aid.
Cheers,
Thomas
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