Comment 5 for bug 1571640

Robert; the greeter run by lightdm. I was going to do some debugging on it myself today. First time I've installed a Unity desktop in several years so I thought it was intended to ensure the greeter elements were readable on high DPI displays.

Here it's on an Asus T300 Chi with a 2560x1440 display. greeter starts at that resolution then switches to 1280x720 as can be seen in the attached /var/log/lightdm/x-0-greeter.log

[+0.59s] DEBUG: main-window.vala:185: Screen is 2560x1440 pixels
[+0.59s] DEBUG: main-window.vala:193: Monitor 0 is 2560x1440 pixels at 0,0
[+0.60s] DEBUG: menubar.vala:537: Adding indicator object 0xcfa2e0 at position 2
[+0.60s] DEBUG: Building new application entry: :1.15 with icon: nm-no-connection at position 0
[+0.61s] DEBUG: menubar.vala:537: Adding indicator object 0xf4ae00 at position 3
[+0.63s] DEBUG: menubar.vala:537: Adding indicator object 0xcfa860 at position 2
[+0.64s] DEBUG: unity-greeter.vala:240: starting system-ready sound
[+0.66s] DEBUG: background.vala:121: Render of background /usr/share/backgrounds/warty-final-ubuntu.png complete

** (unity-settings-daemon:1279): WARNING **: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such method 'RegisterClient'
[+0.82s] DEBUG: main-window.vala:185: Screen is 1280x720 pixels
[+0.82s] DEBUG: main-window.vala:193: Monitor 0 is 1280x720 pixels at 0,0
[+0.86s] DEBUG: background.vala:483: Regenerating backgrounds
[+0.86s] DEBUG: background.vala:68: Making background /usr/share/backgrounds/warty-final-ubuntu.png at 1280x720
[+1.02s] DEBUG: background.vala:121: Render of background /usr/share/backgrounds/warty-final-ubuntu.png complete