Comment 3 for bug 1639255

Sorry, I can't tell, but is the 1920x1080 display the LG TV or the Dell monitor?

[2016-11-07 07:39:10.297720] mirserver: New display configuration:
[2016-11-07 07:39:10.300954] mirserver: 0.1: LVDS 10.0" 135x216mm
[2016-11-07 07:39:10.301068] mirserver: Current mode 1200x1920 56.90Hz
[2016-11-07 07:39:10.301108] mirserver: Preferred mode 1200x1920 56.90Hz
[2016-11-07 07:39:10.301141] mirserver: Logical position +0+0
[2016-11-07 07:39:10.304144] mirserver: 0.2: DisplayPort 9.2" 203x114mm
[2016-11-07 07:39:10.304251] mirserver: Current mode 1920x1080 0.60Hz
[2016-11-07 07:39:10.304293] mirserver: Preferred mode 1920x1080 0.60Hz
[2016-11-07 07:39:10.304326] mirserver: Logical position +1200+0
[2016-11-07 07:39:10.304359] mirserver: 0.3: unused (null)
...
[2016-11-07 07:39:34.941282] mirserver: New display configuration:
[2016-11-07 07:39:34.946373] mirserver: 0.1: LVDS 10.0" 135x216mm
[2016-11-07 07:39:34.946473] mirserver: Current mode 1200x1920 56.90Hz
[2016-11-07 07:39:34.946634] mirserver: Preferred mode 1200x1920 56.90Hz
[2016-11-07 07:39:34.946670] mirserver: Logical position +0+0
[2016-11-07 07:39:34.946703] mirserver: 0.2: unused DisplayPort
[2016-11-07 07:39:34.946734] mirserver: 0.3: unused (null)

If that's the TV then it seems your monitor isn't ever being detected at all by the kernel/HWC drivers.