X freezing when trying to login

X- graphic is freezing (monitor going into sleep mode) when trying to login, but only for one specific user. “xsession-errors-:0” log differs from other users error-log with this:

X Error: BadValue (integer parameter out of range for operation) 2
Extension: 140 (RANDR)
Minor opcode: 7 (RRSetScreenSize)
Resource id: 0x0

How do i reset the graphic setup for this specific user?

Thank you

What Desktop Environment are you using?

For KDE4, delete the folder ~/.kde4/share/apps/kscreen/.

KDE4, nice. Up and running.

Thanks