Last night I was helping my buddy fix his laptop. He's been running Ubuntu
for a few years, and I was trying to convince him to try Trisquel. The
built-in screen on his laptop is cracked and completely unusable, and he uses
a Panasonic TV as his monitor, connected via an HDMI cable.
I was able to boot up from a Trisquel 7 boot USB, and the initial menu
displayed on the TV, but when we actually booted into the live OS, it
wouldn't display on the TV and we were stuck. We ended up reinstalling Ubuntu
17.10, because its live USB displayed on both screens by default :-(
So my first question is, is there a way to boot into a live Trisquel 7 and
get it to turn off the built-in monitor, and use a screen connected via HDMI?
My second question is, can the Trisquel 8 live OS be configured to making
'mirror display' the default behaviour when there is an external screen
plugged in, or at least give the user some display options in the live OS
boot menu?