Can somebody please tell me how (s)he set the time synchronization? Where did you do it and how? Did you use the kde settings -> regional settings -> date & time or did you use Yast -> Date & Time or Yast -> NTP configuration?
Please include the contents of /etc/ntp.conf.
For me right now it makes no difference what I do, with or without time synchronization, the clock keeps running way too fast.
I disabled the firewall, did not help, I enabled it again with port 123 open, no difference.
I am using a virtual machine, but the clocks in my other virtual machines al run fine, no problem there. One even without ntp cause the system won’t accept using a time server.