Comment Re:multiple inputs for 4k? (Score 1) 186
That's how the later model IBM T221s worked (with additional converter boxes dangling off the monitor). Each half of the screen was seen as a 1920x2400 display.
Some newer 4k monitors work similarly using multi-stream transport (MST). The video card sees two 1920x2160 displays. But there is only one DisplayPort cable. Dell's 24" and 32" 4k monitors are like this. Video drivers usually have special support for gluing the two halves back into a single display, but the extra complication can expose bugs in either the driver or the monitor's firmware.