[Bug 1313539] Re: [DisplayPort] monitor shows black screen and "no input signal" after turning the monitor off and on manually
I had this both on Elementary OS and Xubuntu. I've got an AMD card and tried using additional drivers, so I selected one of the video drivers, in my case I picked the following option in eOS 'Using Video driver for the AMD graphics accelerators from fglrx-updates (proprietary)'. This solved the
