Hi the,
RESOLUTION
This is a limitation of the Integrated Intel HD graphics. To resolve this issue, change one of passive DP-DVI dongles with a DP-to-Dual-Link DVI dongle or DP-DP cable as given in the advisory in the web link given below ,
http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c04012437