Which Drivers? GPU?
All the Dell monitors above (2x 2515 & 2x2415) show the Bios screen on my second computer....
I didn't really look too deeply into it, other than knowing it was to do with the fact that for Dell to get 5K @60 Hz they needed to use a GPU card with matched dual DP 1.2 ports to get enough data throughput. As far as I can tell this requires at least an Nvidia GTX960 GPU. Although there are some lower spec cards with dual DP 1.2 they are not configured to support this. Half the display is sent down each cable. I did have a driver error occur, so that I could only see either the left or right hand half of the screen, although spread out across the whole display. In the end I had Dell reinstall the Nvidia driver remotely.
The computer can only do the half and half drive of the monitor once Windows has loaded the Nvidia drivers. When you boot the computer the monitor is able to detect that a boot is in progress, and it displays a Dell logo on screen. You get the same logo when you first power the monitor, even if it is not plugged in.
I got this from reading reviews of the monitor before I bought it. I recall that there was mention of this type of thing being an issue with some other hiDPI monitors too. I still have a VGA monitor in the loft, so could use that with an adaptor if I really desperately needed to access the boot screens. I love the display, the resolution is great, and I actually run mine at 175% not the normally recommended 200%, because the added smoothness seems to make a slightly smaller font size work OK. Seeing what 219 PPI allows I would kill for a 27" plus sized monitor with a resolution in excess of 300 PPI
Alan






