This message was posted on behalf of Intel Corporation
Hello, JanP. Thank you very much for sharing your issue with the Intel Communities Team. I will be more than glad to assist you.
Allow me to share with you that the maximum resolution that the Intel® HD Graphics 4000 will support is: VGA/DVI/HDMI 1920x1080@60Hz and DisplayPort* 2560x1440@60Hz. Please keep in mind that if you use an HDMI* to DP cable, the cable will adjust to the HDMI* resolution.
I hope this answers all your questions.