[Bug 292463] Shift+tab does not send appropriate ANSI sequence

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 14 Jan 2026 18:30:16 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=292463

            Bug ID: 292463
           Summary: Shift+tab does not send appropriate ANSI sequence
           Product: Base System
           Version: 15.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: kip.coul@gmail.com

I use FreeBSD 15.0-RELEASE inside a VirtualBox virtual machine on a Windows
guest. I use VT as the console. The shift+tab key combination does not send the
appropriate ANSI escape sequence (^[[Z). This results in zsh not being able to
cycle backwards through options via shift+tab. I verified this by both using
zsh, and trying to echo the ANSI escape sequence via ctrl+v.

Interestingly, both of these work when ssh'ing to my VM and typing shift+tab
inside my terminal.

At this stage, I am not sure where the problem lies: vt? kbd? elsewhere?

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