Sorry, I haven't tried Byobu, so I can't really comment on that. Everything works as expected here on plain Screen, i.e. captions are set to "user@host:pwd" and are also used for terminal (xterm, gnome-terminal) titles. Since Byobu is an extension of Screen, I'd suspect it's interfering somehow. Maybe by changing the termcaps or the hardstatus string?
Sorry, I haven't tried Byobu, so I can't really comment on that. Everything works as expected here on plain Screen, i.e. captions are set to "user@host:pwd" and are also used for terminal (xterm, gnome-terminal) titles. Since Byobu is an extension of Screen, I'd suspect it's interfering somehow. Maybe by changing the termcaps or the hardstatus string?