Comment 9 for bug 1104230

Looks like progress is being made on implementing the kernel side of Haswell DP MST support - this is probably a good place to track if you're interested in updates on this: http://cgit.freedesktop.org/~airlied/linux/log/?h=drm-i915-mst-support

My understanding is that once that is complete the xorg side will also need updating to support it as well.