Multimonitor support

[beanaroo]

I've migrated from lightdm-webkit-greeter and one difference I noticed is only the primary monitor presents the greeter.

The other monitors' resolutions and positions are configured correctly (per the display setup script set in lightdm.conf, which is a basic xrandr) but they are black and the cursor when over them is the black X.

[NoiSek]

What would you consider to be proper multi-monitor support, just to clarify this ticket for everyone else?

As far as I see it, there are four possibilities here:

• Mirrored view across all displays
• Mirrored backgrounds only across all non-primary displays
• Extend login screen across _n_ displays (As one window, rather than _n_ windows for _n_ displays)
• Continue rendering nothing on non-primary displays

Worth noting that when passing the BIOS startup screen or logging into another OS such as windows, having the other screen black isn't unusual.

[lots0logs]

I think that ideally we would mirror just the background on secondary displays. However, implementing that will not be trivial since background images are controlled by the greeter themes.

[Arzte]

Could you do all them, implementing it as a config option so the user can choose which one they might like best? This would also allow for certain features be implemented early on. (like mirroring the display for example)

[mattnotmitt]

What I would want is a multi-monitor span. My actual setup in i3 has a single image spanning both monitors - is there any way to do that in the setup the greeter uses?

[lots0logs]

No, I'm afraid its not currently possible. Sorry!

[digitalshow]

I present information (public transport schedule, etc.) on my login screen. I would love to see multi monitor support in a way that I can present different information on a second screen. That might just be another window that loads a second file from the theme or that has a js attribute set to the display number. Thanks for the good work so far!

[jkw]

What resolution do you have on your multi-monitor setup? Can you supply a Picture/Screenshot?

[rodneyrod]

Just adding to this, I have a rotated monitor and the login screen displays on that monitor only (even though it's not my primary) and with the wrong rotation.