Package: xserver-xorg-video-intel Version:2:2.16.0-1 I connect a Dell U2711 to the docking station using the display port interface (DP2 in xrandr, see below) and a diplayport cable. Then, the maximum resolution of 2560x1440 at 60.0 Hz does not work, the screen is black. The lower resolutions (e.g. 1920x1200) work.
As suggested in http://rndhero.org/cms/index.php?id=10 a workaround consists of manually setting the refresh rate to 35 Hz. Regards, --Martin [ 52045.402] (II) intel(0): Integrated Graphics Chipset: Intel(R) GM45 [ 52045.402] (--) intel(0): Chipset: "GM45" DP2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 597mm x 336mm 2560x1440 60.0 + 1920x1200 59.9 1920x1080 60.0 1600x1200 60.0 1680x1050 60.0 1280x1024 75.0 60.0 1280x800 59.8 1152x864 75.0 1024x768 75.1 60.0 800x600 75.0 60.3 640x480 75.0 60.0 720x400 70.1 2560x1 35.0*