Who managed to set up KDE on Wayland on nVidia?

Question

linux

Installed fresh Manjaro 17.0.1 64bit KDE.
Switched drivers from nouveau to proprietary nvidia (375.19).
Terrible tearing even just when scrolling in the browser.
Started setting up Wayland on the ArchLinux wiki .
Added 2 session types to the login screen: Plasma (Wayland) and Weston.
At the entrance to Weston - just a black screen. You can exit with Ctrl+Alt+Backspace.
When you enter Plasma (Wayland), a session starts, but it slows down terribly, the percentage is 100%, the logoff does not work, you also have to exit using Ctrl + Alt + Backspace. The "inxi -G" command outputs, among other things: "Display Server: X.Org 1.19.3", i.e. never Wayland.
In addition, adding the QT_QPA_PLATFORM=wayland-egl variable to /etc/environment results in a black screen even before the login screen, i.e. do nothing at all (other than switch to another console).
Initially, the goal was to get fresh tasty KDE and not have tearing thanks to Wayland.
Has anyone managed to set up such a combination?
In passing, the question is: I have an Intel Z87 chipset, i4670 percent in the BIOS, the built-in video is turned off (because there is a discrete one). Does it make sense to enable built-in? Will it give something?

Answer 1

KDE doesn't work with Wayland yet due to a bug in QT. It should be fixed in 5.8.1.
https://wiki.archlinux.org/index.php/wayland#Qt_5
https://codereview.qt-project.org/#/c/184278/