Dragon_32 wrote:See here:

https://forums.opensuse.org/showthread. ... re-on-13-2

Thanks for the link! And yes, it tells about a very similar problem. The reason, why it's more visible in KDE, may be that KDE can make use of 3d acceleration more than other DE's do, and that's a good thing, IMO. However, it isn't limited to 3d or compositing, as you mentioned.

Although nVidia has proved to have responsible Linux developers, I don't know why they haven't been able to fix it for such a long time.

Have you tried enabling triple buffering in your xorg.conf? I recently came across this as a solution to tearing issues with Nvidia's drivers (see Bug 322060). Enabling it not only solved the tearing issues, but also seems to have fixed the corruption problem for me.

mhasler wrote:Have you tried enabling triple buffering in your xorg.conf?...

I have triple buffering enabled.

September 2016 and still not fixed. I have so many video issues with KDE4 it seems like an alpha quality product. Absolutely nothing seems to work correctly. Widgets appear and disappear randomly, screen freezes, video artifacts of all kinds, whether with effects enabled or not! It's like 1995 all over again. Everything worked perfectly - compositing, all of it 10 years ago. Now nothing works at all. This is with the dirt common commercial nvidia drivers and a 100% pure Debian Jessie. This is a disaster.

All other DE's work fine, I like KDE the most, at least I want to, but what the hell happened? (I have not touched KDE in a long time).