I was trying to plug in an external monitor (Dell U2312HM) in my Dell XPS 15 laptop, but all I see is a black screen (on the external monitor, my normal screen is fine). When I open Settings, it shows no sign of the monitor whatsoever. Pressing 'Detect Displays' does nothing. Does anyone have a clue of what's going on here?
I'm a bit of a newbie, so if you want more information, please ask.
lspci |grep vga
. What is the output?