Ubuntu
xserver-xorg-video-intel package

  1. Bug #1501941
  2. Comment #10

Comment 10 for bug 1501941

Revision history for this message
In , Robert Ancell (robert-ancell) wrote :

On Intel systems when the X server exits the display is turned off and remains off. This is triggered when using LightDM and switching to a greeter (starts a second X server) then authenticating in that greeter and returning to the first X server (the greeter X server is stopped).

The cause seems to be a DPMS change from bug 90179 (revision 7d9a74622e5a936e4860fcef8358619bf59adae8) that causes the driver to turn off the output if DPMS is not working.

Tracked in Launchpad:
https://bugs.launchpad.net/bugs/1501941