Recently I had my SP4 replaced, and as part of my new install I used the Intel beta drivers. I had been running my 4k monitors as one off the SP4 dock and one off the SP4 port. When I connected up to my pair of 4k monitors I decided to see if the Intel HD Control Panel which installs with the beta drivers would give me more control. I connected both monitors to the Dock (mDP->DP).
The control panel kept setting one of the two external monitors to match the internal panel (defaulting back to 1920x1080 for both). BUT by turning off the internal panel, I was able to run both external 4k monitors at 4k/30Hz. I tried to increase the refresh to 50Hz and was unsuccessful. When I added the SP4 panel to the mix *as a third monitor*, the external monitors dropped to 29Hz, but all three displays worked.
Just thought you all might like to see this one [semi-successful] data point.
The control panel kept setting one of the two external monitors to match the internal panel (defaulting back to 1920x1080 for both). BUT by turning off the internal panel, I was able to run both external 4k monitors at 4k/30Hz. I tried to increase the refresh to 50Hz and was unsuccessful. When I added the SP4 panel to the mix *as a third monitor*, the external monitors dropped to 29Hz, but all three displays worked.
Just thought you all might like to see this one [semi-successful] data point.
