Hi Pygh,
Do you happen to be using a DisplayPort connection to your monitor? We have reports where some monitors, when connected with a non-compliant DisplayPort cable, can cause this behavior.
If you are using a DisplayPort cable then it is likely you have the problem described here:
https://communities.intel.com/message/225500#225500
If that is the case then changing to a VESA compliant cable (without pin 20 wired) will solve your issue.
If you are not using a DisplayPort cable then we will have to do some more investigating into your particular issue.