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Latitude E6530, Dock, U2415, No signal from computer


I recently bought Dell U2415 monitor. Monitor is connected with my laptop Dell Latitude E6530 through dell docking station. display is connected through mDP. I am getting no output on screen and simply message that no signal from computer in following scenario. Laptop is still running with plugged in. i lock computer and turn off monitor by pressing power button from monitor. if i come back after some time and switch on monitor. i get error that no signal from computer,move keyboard or mouse. i do that and nothing happens. monitor get display only if i switch off my computer and switch it on. thing is my computer also hangs and won't let me do anything until i do  hard restart of system. attaching few screenshot for settings. color selection is set to paper with everything default. could you please help me with resolving this issue?

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