KDE black screen under Kernel 4.2.3 + nvidia 355.11-4

[Barry Scott]

If I boot under kernel-4.2.3-200.fc22.x86_64 and log into the KDE desktop
after the progress bar screen I get a black screen with nothing showing.
I can Alt-F2 and run konsole and it will show up.

Booting back into kernel-4.1.10-200.fc22.x86_64 I have no problems with
KDE desktop.

Has anyone else seen this behaviour?

Barry