[Bug 263099] vidcontrol(1) -p and -P does not work

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 06 Apr 2022 21:33:05 UTC

Tomoaki AOKI <junchoon@dec.sakura.ne.jp> changed:

           What    |Removed                     |Added
                 CC|                            |junchoon@dec.sakura.ne.jp

--- Comment #6 from Tomoaki AOKI <junchoon@dec.sakura.ne.jp> ---
(In reply to Chris Hutchinson from comment #5)

Are you 100% sure all your hardwares are legacy (non-UEFI) booted?
On UEFI, efifb (only usable via vt) is forced and sc is not emulated (by
firmware) at all.
So nothing can detect legacy (character based) frame buffer on UEFI-booted
environment. (For UEFI-capable hardwares with legacy boot ennbled, CSM of UEFI
firmware would take care of it, just stop hiding physical text frame buffer or
emulate actually-nonexistent hardware, which would be dependent on hardware).

It's a limitation of UEFI, not of FreeBSD. So kern.vty=sc on UEFI-booted
environment would be ignored and forced vt.

On vidcontrol side, discussions would be needed which to capture, graphical
frame buffer or vt-internal text buffer.
Someone would want images displayed to be captured, that means, texts are also
captured as image, not as characters.

But OTOH, others would want only texts to be captured as characters.
This is like the behaviour with mice driven by moused.

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