[Bug 192639] New: vt(4): scrollback and mouse support problems with hw.vga.textmode=1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192639

            Bug ID: 192639
           Summary: vt(4): scrollback and mouse support problems with
                    hw.vga.textmode=1
           Product: Base System
           Version: 10.0-STABLE
          Hardware: Any
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: wblock at FreeBSD.org

Tested on 10.0-STABLE amd64 r269851.

With hw.vga.textmode=1, Scroll Lock to enable scrollback does not work on
ttyv0.  The screen locks but does not scroll.  Scrollback works on other
virtual
terminals, just not on ttyv0.

moused does not work when hw.vga.textmode=1.  Even though moused is running,
the mouse pointer does not appear, and marking or pasting text does not work. 
This happens on all virtual terminals.  (Tested with USB mouse, so this is the
"nondefault" version of moused, and does not need to be enabled in rc.conf by
default.)

Setting hw.vga.textmode=0 makes scrollback work on all ttys, and moused
functions again.

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