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I just updated my Xubuntu 14.10 desktop to 15.04 and I'm having the following issue:

When I lock my computer (or when the inactivity timer locks it for me), the screen goes blank and I cannot get into my session. The power light on the monitor is still green which means that the monitor hasn't gone to sleep - i.e. that there is still a video signal but no picture is being sent. The only way to get back into the desktop environment is to switch to a text terminal (Ctrl+Alt+F1) and reboot.

I found a known issue about black screens after boot, but that's not my problem.

I searched through the syslog, but could not find any messages that seem to be related.

I have all the latest packages available via apt-get upgrade.

How can I troubleshoot and fix this issue?

  • I also just discovered that I can shorten the wait time by only doing sudo killall Xorg instead of a full reboot, but that still doesn't solve the problem. – Moshe Katz May 7 '15 at 19:04
  • please edit that comment in. – Tim May 7 '15 at 21:37
  • @Tim as far as I'm concerned, it's inconsequential; just a shortcut to not need a full reboot. – Moshe Katz May 7 '15 at 21:40
  • Check your screensaver settings. I has this in Kubuntu and resetting the screensaver to something fixed the lock screen for me. – TheWanderer May 7 '15 at 23:42
  • @Zacharee1 Disabling and reenabling the screen locker has fixed the problem. If you write your comment as an answer, I'll accept it. – Moshe Katz May 11 '15 at 0:06
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I had the same problem. I fixed it by going into Light Locker Settings (not sure what it's called: I'm in Windows) and resetting the lockscreen option (turning it off then on again).

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    In Xubuntu 14.04, it's called "Light Locker Settings", and all you have to do is turn it off and on again. – Moshe Katz May 11 '15 at 0:46
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    For me, resetting the lock screen option did not work. I installed the "xscreensaver" from software center and it solved the problem. – Unique Aug 16 '17 at 14:35

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