External display suddenly not detected

Posted by NChase on Ask Ubuntu See other posts from Ask Ubuntu or by NChase
Published on 2013-11-05T15:50:32Z Indexed on 2013/11/05 16:12 UTC
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Filed under:

display

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hdmi

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external-monitor

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xrandr

I have a Lenovo IdeaPad U410 running Ubuntu Desktop 13.04. I have an external monitor that I connect to via HDMI, and it's worked flawlessly for six months. I plug in my laptop, it detects the display. The "change display" key built into the laptop works for switching between the two screens. Never any problems.

This afternoon, when I reconnected my computer after taking it into another room for a bit, it didn't work. When I open up Display settings, it can't detect the display. I tried disconnecting/reconnecting everything multiple times. And most strangely, that same "change display" key now behaves like a Super key, opening the dash instead of toggling the display. Nothing at all changed between when I plugged it in this morning and when it stopped working a few hours later. I tried xrandr, that doesn't detect it either.

Anyone have any ideas?

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