I just saw jhb@’s BTX commit which is very exciting. As he noted in the log, this should fix the long-standing BTX halt issue when you boot from USB cdrom (I’m also a victim). Last year, I tried with kib@’s BTX patch and it works, but it never gets committed due to other issues. Now, thank you John and Kostik. I believe this helps many users to install FreeBSD on their laptops (well, this should be in April’s snapshot?).