I recently upgraded to the NVIDIA driver version 185.18.14 (nvidia-glx is 185.18.14-2) and since then KDM displays garbage on my secondary monitor while the logon-screen is visible.
After logging in, shortly both screens contain garbage and then everything looks fine again.
To me it looks like the garbage is whatever is in the graphics card memory at that moment. After a cold boot, it's mainly black and white blocks with some noise but after a reboot (no matter if Linux or Windows ran previously) the blocks contain stuff that was visible earlier.
How can I make it look nice again?
My KDM version is 4:4.3.0-2
Linux: Debian, 2.6.30-1-amd64
