I have exactly the same problem with partial solution. I am able to run U3011 using HDMI cable from Samsung 780z5e with intel 4000 GPU using intel custom resolution application at 2560x1600@50p. It does not allow me to use 60Hz, which is almost for sure limitation of the driver as other users are able to use 2560x1600@60p from linux.
The main problem is bug in U3011 which is reporting max resolution for its HDMI as 1080p when it obviously supports native 2560x1600@50 at least.
Can you please explain this bug? Or is it inteded limitation for no reason what so ever? many thanks
No, not a bug. The U3011 HDMI 1.3 was never designed to do 2560x1600 60Hz. We designed the DP and DVI-D to do the higher resolutions. Back in 2011 when we released this model, HDMI was designed to do 1920x1080p to match the HDCP protocol.