I have Toshiba P75 A7200 with HD 4600 and today I'v bought LG34WK650. Unfortunatelly I cant setup 2560x1080 resolution on this monitor . The highest possible is 1920x1080. I use hdmi cable to connect laptop with new monitor. Monitor has also displayport (laptop hasn't).
I can buy adapter hdmi->displayport, however I don't now if this will resolve my problem.....?