For everyone with a Gigabyte motherboard (H87NWIFI), there is a new BIOS release today (RC 1.6.2) .
I haven't tried it cause I'm currently using really old Intel graphics drivers which also solves the HDMI-problem.
http://www.gigabytenordic.com/wordpress/how-to-update-your-bios-on-gigabyte-motherboards/