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Re: Zig zag side edges when I move a window around quickly




On Wed, 15 Mar 2017 09:39:58 +0100
René J.V. Bertin <rjvbertin@xxxxxxxxx> wrote:

> On Wednesday March 15 2017 06:13:22 Duncan wrote:
> 
> >That's easily togglable (and strength configurable when it's on) as kwin's 
> >wobbly-windows effect.  Plasma system settings, Workspace, Desktop 
> >Behavior, Desktop Effects.  There's a big list broken into categories.  
> >In the Appearance category, uncheck or hit the reconfigure icon for 
> >Wobbly Windows, and you can turn it off entirely (uncheck) or reduce/
> >increase the wobbliness (configure).
> 
> That's presuming the OP has the effect enabled in the first place. What he describes can also be the result of a particularly bad video configuration where the software draws much faster than the hardware can follow.
> First things to check are if you're using the best drawing method the hardware can support; XRender/Native for anything that doesn't support OpenGL properly, OpenGL/Raster for hardware that does. That's probably in the compositor settings with Plasma5. Then you have to experiment with tearing prevention. I never tried to figure out the exact meaning of the different options but basically it means you start a screen content update when the monitor is about to start its own refresh (on old CRTs that would be when the electron beam was about to go back to the top-left screen corner).
> If your screen has a refresh rate of 50ms or better (20 frames/sec or more) you shouldn't notice any issues with moving, resizing etc (fast and/or very fine-grained animations may suffer but those are candy anyway).
> 
> If you like to see window geometry displayed when moving windows, use the desktop effect and not the option in the KWin/Moving settings (and certainly not both).
> 
> Finally, glitches like the OP describes can probably be attenuated by making window contents transparent while moving. That's a desktop option that also works with the XRender backend, and a very useful one (an almost perfect marriage between moving the window frame only as I usually prefer, and solid/opaque moves).
> 
> R.
Thanks. Interesting. I changed the compositor speed to one mark off instant and the edges track. For me that option is in monitor in kde "system" settings. It was set mid way.

They tracked better when I activate wobble to see what would happen. That area looks a bit clunky though. I tried zeroing all of it's settings. Made things worse. The original setting tracked and wobbled very well. Reseting to defaults wouldn't get that back. It did restore the advanced setting and but not the normal ones. Playing with those by hand didn't achieve anything. No more good wobbles - not that I want them.

I'm using the nvidia driver. Currently that's been encouraged a little on opensuse. Changing to that to try and fix it just sharpened text up a tiny touch on the desktop but I wouldn't have complained about how it was. The graphics card is a few years old now. Nvidia via Asus and as fast as they go without a fan. There is a newer model but looking at it's spec it wouldn't have helped this sort of problem. Motherboard has a 3.8ghz xenon on it. The only task that gets that running flat out is a kfind content search. ;-) I got fed up with the cost of building a workstation so bought an ex demo one.

John
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