I have one monitor that I use for both my PC (via VGA) and my Linux machine (via DVI). I just use it for one computer at a time, by pulling out the not needed cable and plugging in the required one.

But when I unplug the DVI, after starting Linux, and then plug it back in, I just get a black screen and I have to reboot the Linux machine to get anything to happen.

How can I get it to work properly? ( I don't get this issue reconnecting to my Windows PC)

  • it's always interesting which version of ubuntu you are using – Private Sep 22 '14 at 11:20
  • Im using latest version of Xbuntu – Paul Taylor Sep 22 '14 at 11:38
  • What Graphics Card are you using, and with which driver? – s3lph Sep 22 '14 at 12:21
  • Have you tried connecting the Linux box via VGA? Different results? – Elder Geek Dec 11 '14 at 14:47

Go to

  • system settings
  • Brightness & Lock

Switch "Turn screen off when inactive for" to "Never"

Never switch off

For Xubuntu :

Go to "Power Manager"
Tab "On AC"
Tab "Monitor".
Set "Switch off display when computer is inactive" to never
  • I'm using latest version of Xubuntu - I couldn't find that option but I did find the similar Light Locker and also Power Manager. I changed all settings to Never, unplugged DVI cable expecting that it was solved but no change, back to blank screen :( – Paul Taylor Sep 22 '14 at 11:41

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