Code review comment for lp:~muktupavels/unity-greeter/add-primary-monitor-support

On Wed, Jul 16, 2014 at 5:58 AM, LukeKendall <email address hidden> wrote:

> Thanks, I had the same problem on a desktop system with dual monitors
> (connected via HDMI and DVI). Primary monitor was HDMI when logged in, but
> before login, the authentication panel was plugged in to the 2nd display
> (which I normally have turned off). Which makes sense: how would the
> system know which user's monitors.xml file to use, before login?
>

System does not know it. It will use /var/lib/lightdm/.config/monitors.xml
if you create it. You can copy your configuration file
/home/[user]/.config/monitors.xml to /var/lib/lightdm/.config/ if you want.

> BTW, it might be a good idea in a multi-monitor system, to choose the
> monitor that's powered on, rather than one that's powered off, to present
> tyhe login panel on. Just a thought.
>

You could try open new bug for that. I don't know how to detect if monitor
is powered on or off.