Been experimenting with Ubuntu on my Toshiba Satellite U500. Using an external display (AOC 23" LCD) as primary.
For the first 20 or so boots, the Ubuntu 15.04 login prompt appeared on my external display exactly where you'd want it.
Suddenly, now, it only appears on the laptop screen. The external display does come on and shows the Ubuntu wallpaper. But I have to get up and walk over to the laptop to login. Then Ubuntu finishes booting to the proper desktop on my external display.
This is a big pain in the ass. I've done a repair reinstallation - not wiping everything, but reinstalling from USB. Hasn't fixed it. No luck searching here through other threads.
Any help will be appreciated.