Hello,

I have a nvidia GT 320M graphic card on my laptop.
GNOME and Xfce desktops run smoothly using the "nouveau" open-source driver.
Unfortunately, this is not the case of Plasma : I get an annoying tearing effect, for example when scrolling down a page or when moving windows.
I think this must be a VSync issue, since Xfce has the same problem unless I check an "enable VSync" box in its settings.
Furthermore, I found out that when using the nvidia proprietary driver, the problem could be solved by altering the VSync settings in the Plasma control panel.
But I cannot make Plasma work properly with nouveau. What should I do ?
There is certainly something to do, since GNOME and Xfce work properly...

Thank you

P.S. I tried it on Chakra 2015.11 "Fermi", Plasma version 5.4.2

run "kcmshell5 kwincompositing" and set "tearing prevention" to "full scene repaints" - also ensure that you're not using the xrender backend.

Thanks for replying. In fact, upgrading from Plasma 5.4 to 5.5 solved the problem