Cannot leave tui mode with Ctrl-X A nor see program output in tui mode

Question

Problem A:

1. I start gdb in command line with \"gdb test\"
2. I press ctrl-x,ctrl-a before I do anything else
3. Then I set break po

Answer 1

Change your terminal to get rid of your first problem. I used to use gnome-terminal my self, but then changed to terminator. Some terminals don't support keys like Alt sometimes (used to experience this in vim with some Alt+something maps)

You can change forcus to another window by 'focus winName', in your case, use 'focus src' got this from here

Not sure about your 2nd problem. Good luck!