When I log in, my second monitor is "off" by default; Ubuntu acts as if it's not connected.
I can enable it by going to
System Settings -> Displays and flipping the
OFF switch to
ON, but I'd rather not do this every time I start up.
I don't know enough about my system to give more detail, but I can run whatever commands you think would be helpful.
Full steps to reproduce:
- With laptop off, connect second monitor by VGA.
- Turn on laptop.
- Log in at the login screen. (At the login screen, the second monitor mirrors my laptop.)
- Wait for the login to complete. While waiting for login to complete, I see the following behavior, in order:
- The second monitor acts correctly and no longer mirrors. This lasts for a few seconds. Both screens show my wallpaper.
- Second monitor no longer detected. My laptop has a black background.
- Login complete. I can see the launcher and my terminal, but the second monitor is black.
To add more information, this is Ubuntu 12.04 LTS on a VAIO Z series laptop with an Acer monitor. I haven't found this particular problem described anywhere, so I haven't tried anything yet.