Why does display freeze when using DisplayPort ?

Solution In Progress - Updated -

Issue

HP ZBook 15 display freezes when cable is plugged in to DisplayPort connector. External display HP Compaq LA1905wg notices that other end is plugged (led turns to green) but laptop's display freezes, keyboard seem to work, lights turn on when pressing key etc. External display in VGA-port works ok

Laptop info:
Model: HP ZBook 15
SKU: D5H42AV#
System bios: L70 Ver. 01.07
Video bios: INTEL 2171
Video bios: nVidia 09/13/13

Hybrid graphics settings on bios:
Hybrid Graphics -> Enable
Hybrid Graphics Enhanced Display Feature -> ticked

Environment

  • Red Hat Enterprise Linux 7
  • HP ZBook 15

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