Cannot mirror display output between primary and secondary display

[Jarek Sobiecki]

I'm using LATITUDE E5510 laptop, on ubuntu 12.04 LTS

On gnome-control-center display, application properly shows maximal resolution, that works on my machine (1600x900).
Resolutions detected on primary display includes only one resolution (1600x900).
When I plug secondary monitor, with different resolutions set supported, I cannot enable display mirroring (this option is greyed out). In secondary monitor, I can use few different resolutions.

I was able to work-around this problem, by simple adding resolution to eDP1 screen (primary display) with xrandr tool.
xrandr --addmode eDP1 "1280x1024"
After that, I was able to change resolution at gnome-control-center display applet to "1280x1024" on my primary display, and I was able to use mirroring feature. (both devices switched to 1280x1024 resultion).

It's not a critical problem for me (since my workaround works for me), but I think that fixing this issue can improve overall user experience.

If requested, I can provide lshw output (or other).

Best regards,

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Lars Noodén (larsnooden)]

A work-around is to add the package 'nvidia-settings' and use that to set up mirroring. However, it would be best to get it fixed in gnome-control-center. The control center works otherwise but mirroring is really needed when doing presentations because it is necessary to see on the laptop screen what is being projected behind you without committing the faux pax of turning around while presenting.

What data is needed for this bug?