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VIRTUAL TERMINALS(4)   FreeBSD Kernel Interfaces Manual   VIRTUAL TERMINALS(4)

NAME
     vt - virtual terminal console driver

SYNOPSIS
     options TERMINAL_KERN_ATTR=_attribute_
     options TERMINAL_NORM_ATTR=_attribute_
     options VT_MAXWINDOWS=N
     options VT_ALT_TO_ESC_HACK=1
     options VT_TWOBUTTON_MOUSE
     options VT_FB_DEFAULT_WIDTH=X
     options VT_FB_DEFAULT_HEIGHT=Y
     options SC_NO_CUTPASTE
     device vt

     In loader.conf(5):
     hw.vga.textmode=1
     kern.vty=vt
     kern.vt.fb.default_mode="<X>x<Y>"
     kern.vt.fb.modes.<connector>="<X>x<Y>"

     In loader.conf(5) or sysctl.conf(5):
     kern.vt.kbd_halt=1
     kern.vt.kbd_poweroff=1
     kern.vt.kbd_reboot=1
     kern.vt.kbd_debug=1
     kern.vt.kbd_panic=0

DESCRIPTION
     The vt device provides multiple virtual terminals with an extensive
     feature set:

           Unicode UTF-8 text with double-width characters.

           Large font maps in graphics mode, including support for Asian
           character sets.

           Graphics-mode consoles.

           Integration with KMS (Kernel Mode Setting) video drivers for
           switching between the X Window System and virtual terminals.

   Virtual Terminals
     Multiple virtual terminals are provided on a single computer.  Up to
     sixteen virtual terminals can be defined.  A single virtual terminal is
     connected to the screen and keyboard at a time.  Key combinations are
     used to select a virtual terminal.  Alt-F1 through Alt-F12 correspond to
     the first twelve virtual terminals.  If more than twelve virtual
     terminals are created, Shift-Alt-F1 through Shift-Alt-F4 are used to
     switch to the additional terminals.

   Copying and Pasting Text with a Mouse
     Copying and pasting text from the screen with a mouse is supported.
     Press and hold down mouse button 1, usually the left button, while moving
     the mouse to select text.  Selected text is highlighted with reversed
     foreground and background colors.  To select more text after releasing
     mouse button 1, press mouse button 3, usually the right button.  To paste
     text that has been selected, press mouse button 2, usually the middle
     button.  The text is entered as if it were typed at the keyboard.  The
     VT_TWOBUTTON_MOUSE kernel option can be used with mice that only have two
     buttons.  Setting this option makes the second mouse button into the
     paste button.  See moused(8) for more information.

   Scrolling Back
     Output that has scrolled off the screen can be reviewed by pressing the
     Scroll Lock key, then scrolling up and down with the arrow keys.  The
     Page Up and Page Down keys scroll up or down a full screen at a time.
     The Home and End keys jump to the beginning or end of the scrollback
     buffer.  When finished reviewing, press the Scroll Lock key again to
     return to normal use.

DRIVER CONFIGURATION
   Kernel Configuration Options
     These kernel options control the vt driver.

     TERMINAL_NORM_ATTR=attribute

     TERMINAL_KERN_ATTR=attribute
              These options allow changing the default colors used for normal
              and kernel text.  Available colors are defined in
              <sys/terminal.h>.  See EXAMPLES below.

     VT_MAXWINDOWS=N
              Set the number of virtual terminals to be created to N.  The
              value defaults to 12.

     VT_ALT_TO_ESC_HACK=1
              When the Alt key is held down while pressing another key, send
              an ESC sequence instead of the Alt key.

     VT_TWOBUTTON_MOUSE
              If defined, swap the functions of mouse buttons 2 and 3.  In
              effect, this makes the right-hand mouse button perform a paste.
              These options are checked in the order shown.

     SC_NO_CUTPASTE
              Disable mouse support.

     VT_FB_DEFAULT_WIDTH=X
              Set the default width to X.

     VT_FB_DEFAULT_HEIGHT=Y
              Set the default height to Y.

BACKWARDS COMPATIBILITY
     Several options are provided for compatibility with the previous console
     device, sc(4).  These options will be removed in a future FreeBSD
     version.

           vt Option Name               sc Option Name
           TERMINAL_KERN_ATTR           SC_KERNEL_CONS_ATTR
           TERMINAL_NORM_ATTR           SC_NORM_ATTR
           VT_TWOBUTTON_MOUSE           SC_TWOBUTTON_MOUSE
           VT_MAXWINDOWS                MAXCONS
           none                         SC_NO_CUTPASTE

START-UP OPERATION WITH X86 BIOS SYSTEMS
     The computer BIOS starts in text mode, and the FreeBSD loader(8) runs,
     loading the kernel.  If hw.vga.textmode is set, the system remains in
     text mode.  Otherwise, vt switches to 640x480x16 VGA mode using vt_vga.
     If a KMS (Kernel Mode Setting) video driver is available, the display is
     switched to high resolution and the KMS driver takes over.  When a KMS
     driver is not available, vt_vga remains active.

LOADER TUNABLES
     These settings can be entered at the loader(8) prompt or in
     loader.conf(5).

     hw.vga.textmode
             Set to 1 to use virtual terminals in text mode instead of
             graphics mode.  Features that require graphics mode, like
             loadable fonts, will be disabled.

     kern.vty
             Set this value to `vt' or `sc' to override the default driver
             used for the system console.  By default, sc(4) is used on
             computers that boot from BIOS, and vt is used on computers that
             boot from UEFI.

     kern.vt.fb.default_mode
             Set this value to a graphic mode to override the default mode
             picked by the vt backend.  The mode is applied to all output
             connectors.  This is currently only supported by the vt_fb
             backend when it's paired with a KMS video driver.

     kern.vt.fb.modes.connector_name
             Set this value to a graphic mode to override the default mode
             picked by the vt backend.  This mode is applied to the output
             connector connector_name only. It has precedence over
             kern.vt.fb.default_mode.  The names of available connector names
             can be found in dmesg(8) after loading the KMS driver.  It will
             contain a list of connectors and their associated tunables.  This
             is currently only supported by the vt_fb backend when it's paired
             with a KMS video driver.

KEYBOARD SYSCTL TUNABLES
     These settings control whether certain special key combinations are
     enabled or ignored.  The specific key combinations can be configured by
     using a keymap(5) file.

     These settings can be entered at the loader(8) prompt or in
     loader.conf(5) and can also be changed at runtime with the sysctl(8)
     command.

     kern.vt.kbd_halt
             Enable halt keyboard combination.

     kern.vt.kbd_poweroff
             Enable power off key combination.

     kern.vt.kbd_reboot.
             Enable reboot key combination, usually Ctrl+Alt+Del.

     kern.vt.kbd_debug
             Enable debug request key combination, usually Ctrl+Alt+Esc.

     kern.vt.kbd_panic
             Enable panic key combination.

FILES
     /dev/console
     /dev/consolectl
     /dev/ttyv*               virtual terminals
     /etc/ttys                terminal initialization information
     /usr/share/vt/fonts/*.fnt
                              console fonts
     /usr/share/vt/keymaps/*.kbd
                              keyboard layouts

EXAMPLES
     This example changes the default color of normal text to green on a black
     background, or black on a green background when reversed.  Note that
     white space cannot be used inside the attribute string because of the
     current implementation of config(8).

           options TERMINAL_NORM_ATTR=(FG_GREEN|BG_BLACK)

     This line changes the default color of kernel messages to be bright red
     on a black background, or black on a bright red background when reversed.

           options TERMINAL_KERN_ATTR=(FG_LIGHTRED|BG_BLACK)

     To set a 1024x768 mode on all output connectors, put the following line
     in /boot/loader.conf:

           kern.vt.fb.default_mode="1024x768"

     To set a 800x600 only on a laptop builtin screen, use the following line
     instead:

           kern.vt.fb.modes.LVDS-1="800x600"

     The connector name was found in dmesg(8):

           info: [drm] Connector LVDS-1: get mode from tunables:
           info: [drm] - kern.vt.fb.modes.LVDS-1
           info: [drm] - kern.vt.fb.default_mode

SEE ALSO
     kbdcontrol(1), login(1), vidcontrol(1), atkbd(4), atkbdc(4), keyboard(4),
     screen(4), splash(4), syscons(4), ukbd(4), kbdmap(5), rc.conf(5),
     ttys(5), config(8), getty(8), kbdmux(8), kldload(8), moused(8),
     vtfontcvt(8)

HISTORY
     The vt driver first appeared in FreeBSD 9.3.

AUTHORS
     The vt device driver was developed by Ed Schouten <ed@FreeBSD.org>, Ed
     Maste <emaste@FreeBSD.org>, and Aleksandr Rybalko <ray@FreeBSD.org>, with
     sponsorship provided by the FreeBSD Foundation.  This manual page was
     written by Warren Block <wblock@FreeBSD.org>.

CAVEATS
     Paste buffer size is limited by the system value {MAX_INPUT}, the number
     of bytes that can be stored in the terminal input queue, usually 1024
     bytes (see termios(4)).

FreeBSD 11.0-PRERELEASE        October 20, 2014        FreeBSD 11.0-PRERELEASE

NAME | SYNOPSIS | DESCRIPTION | DRIVER CONFIGURATION | BACKWARDS COMPATIBILITY | START-UP OPERATION WITH X86 BIOS SYSTEMS | LOADER TUNABLES | KEYBOARD SYSCTL TUNABLES | FILES | EXAMPLES | SEE ALSO | HISTORY | AUTHORS | CAVEATS

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