Dank at 00:35, 4 July 2021

2021-07-04T00:35:53Z

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	==See also==		==See also==
	* [[Framebuffer]]		* [[Framebuffer]]

			[[CATEGORY: Terminals]]

WikiSysop: 1 revision

2009-01-28T07:32:13Z

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Dank: /* Management */

2008-12-03T17:16:41Z

Management

New page

The nomenclature here is annoying. The ''system console'' is a device concept, mapped to a character device (usually a serial port or virtual terminal). Kernel messages (having a priority above ''console_loglevel'', see <tt>linux/kernel.h></tt> and the <tt>klogd(8)</tt> man page) are sent there, and single-mode login is supported through this device.

==Documentation==
* <tt>Documentation/consoles/console.txt</tt> explains console binding
* <tt>Documentation/svga.txt</tt> explains VGA text consoles
* <tt>Documentation/fb/fbcon.txt</tt> explains framebuffer consoles
* <tt>/dev/tty0</tt> is the current console at any given time
** How does [[X]] interact with this, especially in [xgk]dm's presence?
* Man page <tt>console_codes(4)</tt> details terminal control codes for the Linux console
* Man pages for <tt>setterm(1)</tt>, <tt>setfont(8)</tt>, <tt>loadkeys(1)</tt>, <tt>fbset(1)</tt>

==Kernel options==
===Character devices===
* CONFIG_VT=y enables virtual terminals, and is necessary to access...
** CONFIG_VT_CONSOLE=y enables sending kernel console messages to virtual terminals
** CONFIG_VT_HW_CONSOLE_BINDING=y enables runtime rebinding of console drivers to virtual terminals
* CONFIG_SERIAL_8250=y is necessary to access...
** CONFIG_SERIAL_8250_CONSOLE=y enables sending kernel console messages to serial ports
===Graphics support===
* CONFIG_FB=[ym] enables the [[framebuffer]] abstraction, and is necessary to access...
====Console display driver support====
* CONFIG_VGA_CONSOLE=y enables virtual terminals on VGA hardware, and is necessary to access...
** CONFIG_VGACON_SOFT_SCROLLBACK=y enables placing scrollback data in system memory
** CONFIG_VIDEO_SELECT=y enables video mode selection support
* CONFIG_VIDEO_SELECT=y enables text mode selection on system startup using the <tt>vga=...</tt> parameter
* CONFIG_FRAMEBUFFER_CONSOLE=y enables virtual terminals on framebuffers

==Kernel command line parameters==
* <tt>console=ttyX</tt> sets the system console
** By default, this is tty0 (see [[Consoles#Documentation|note]] above regarding tty0)
** Use ttySX for the Xth serial port
** If no VGA card is installed, the default system console will go to ttyS1.
* <tt>no-scroll</tt> disables use of hardware scrolling
** "Required by some Braille machines", according to <tt>bootparam(7)</tt>
* <tt>vga=...</tt> sets up the VGA text console

==Management==
* Switch to virtual terminal X with Alt+Fn+X
* <tt>setterm</tt> command controls virtual term parameters
** <tt>setterm -blength 0</tt> disables the console bell for a virtual terminal
* <tt>setfont</tt> command controls virtual terminal fonts
** Supplied by the [[Debian]] packages [http://packages.debian.org/kbd kbd] and [http://packages.debian.org/kbd-compat kbd-compat]
* <tt>loadkey</tt> command controls virtual terminal keybindings
** Supplied by the [[Debian]] packages [http://packages.debian.org/console-tools console-tools] and [http://packages.debian.org/kbd kbd]
* <tt>fbset</tt> command controls [[framebuffer]] settings
** Supplied by the [[Debian]] package [http://packages.debian.org/fbset]

==[[sysfs]]==
* <tt>/sys/devices/virtual/vtconsole</tt>, to which <tt>/sys/class/vtconsole</tt>'s contents link

==See also==
* [[Framebuffer]]

Consoles - revision history

Dank at 00:35, 4 July 2021

WikiSysop: 1 revision

Dank: /* Management */