login screen scaling issue M3800 (factory image plus apt-get upgrade)

[Jared Dominguez]

I just imaged a Dell Precision M3800 Developer Edition with UHD (4K) display. After installation, I apt-get update'd and apt-get upgrade'd and now see an issue with the login screen. (See attached picture.) No customization was done other than doing a standard upgrade (none of the used repositories were changed).

[Jared Dominguez (jared-dominguez)]

Note that upon login, the problem goes away. But logging back out, it's back. So I'm pretty sure it's a lightdm issue.

[Jared Dominguez (jared-dominguez)]

Also, a scaling factor of 2 is used.

[Mario Limonciello (superm1)]

Since it's likely a lightdm issue, maybe try rolling back lightdm and see if it goes away? We started with lightdm 1.10.0-0ubuntu3

[Robert Ancell (robert-ancell)]

Have a look at /var/log/lightdm/x-*-greeter.log

[Jared Dominguez (jared-dominguez)]

Thanks Robert. See the attached log. This seems to be relevant from there:

[+0.45s] DEBUG: main-window.vala:185: Screen is 3840x2160 pixels
[+0.45s] DEBUG: main-window.vala:193: Monitor 0 is 3840x2160 pixels at 0,0
[+0.45s] DEBUG: main-window.vala:185: Screen is 1920x1080 pixels
[+0.45s] DEBUG: main-window.vala:193: Monitor 0 is 1920x1080 pixels at 0,0
[+0.47s] DEBUG: menubar.vala:538: Adding indicator object 0x1097450 at position 2

[Mario Limonciello (superm1)]

A patch for this was included in the factory image that hasn't yet been merged into unity-greeter. I'll mark this as a duplicate of that bug.