Could be a driver or firmware that is outdated
This link gives you the drivers.
The KB link takes you to a HP page that lists out drivers and firmware for the make and model of your hardware.
http://kb.vmware.com/kb/2030818
Could you verify and update to the latest firmware and drivers for the system and check? You might wanna involve HP as firmware and driver verification and updates can get intimidating.
Regards
a