I install over 5 times openSUSE Leap with KDE or Gnome.
After login system freeze.
KDE loop forever and my hard drive work hard over and over but nothing show on desktop, only the wallpaper.
I need to brake KDE (CTRL+ALT+BSpace) to reload loginer.
Icewm is ok an run but KDE or Gnome not.
I try to solve the problem installing nvidia driver, but no luck.
My nvidia is 9800GT.
On Gentoo run well, is not the hardware.
I play many games without problems.