fbcond can start before vesad has registered the display, leaving
TextScreen.display.map as None. The old write() silently dropped all
output in that state, so getty/login prompts written during the race
window never appeared.
- Add pending_writes buffer to TextScreen.
- Buffer writes when display.map is None and log a warning.
- Flush buffered writes after a successful display handoff.
- Upgrade handoff success logs from debug to info so they appear in
the default boot log.
vasilito
f0ff6a7976