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Kmscon is a simple terminal emulator based on linux kernel mode setting (KMS).
It is an attempt to replace the in-kernel VT implementation with a userspace
console. See kmscon(1) man-page for usage information.
== Requirements ==
Kmscon requires the following software:
- libudev: providing input, video, etc. device hotplug support (>=v172)
- libxkbcommon: providing internationalized keyboard handling
Everything else is optional:
For video output at least one of the following is required:
- fbdev: For framebuffer video output the kernel headers must be installed
and located in the default include path.
- DRM: For unaccelerated drm output the "libdrm" library must be installed
and accessible via pkg-config.
- OpenGLES2: For accelerated video output via OpenGLESv2 the following must
be installed: libdrm, libgbm, egl, glesv2 (i.e., mesa)
For font handling the following is required:
- 8x16: The 8x16 font is a static built-in font which does not require
external dependencies.
- unifont: Static font without external dependencies.
- pango: drawing text with pango
Pango requires: glib, pango, fontconfig, freetype2 and more
For multi-seat support you need the following packages:
- systemd: Actually only the systemd-logind daemon and library is required.
== Install ==
To compile the kmscon binary, run the standard autotools commands:
$ test -f ./configure || NOCONFIGURE=1 ./
$ ./configure
$ make
$ make install
To compile the test applications, run:
$ make check
If you want only a very basic kmscon program without any major dependencies,
$ ./configure --with-video=fbdev,drm2d --with-renderers= --with-fonts=unifont --disable-multi-seat --with-sessions=dummy,terminal
However, you will loose a lot of functionality by dropping all dependencies.
The following configure options are available. If build-time dependencies
cannot be satisfied, an option is automatically turned off, except if you
explicitly enable it via command line:
--enable-multi-seat: This requires the systemd-logind library to provide
multi-seat support for kmscon. [default: on]
--enable-hotplug: This requires libudev for hotplugging support. This is
currently mandatory and cannot be disabled. [default: on]
--enable-debug: Enable debug mode/messages [default: on]
--enable-optimizations: Enable code optimizations [default: on]
--enable-eloop-dbus: Build dbus extension for eloop library [default: off]
Backends for several subsystems in kmscon can be selected with the following
options (all of them take a comma-separated list of backend names):
--with-video: Video backens. Available backends are:
- fbdev: Linux fbdev video backend
- drm2d: Linux DRM software-rendering backend
- drm3d: Linux DRM hardware-rendering backend
Default is: fbdev,drm2d,drm3d
--with-fonts: Font renderers. Available backends are:
- unifont: Static built-in non-scalable font (Unicode Unifont)
- freetype2: Freetype2+fontconfig based scalable font renderer
- pango: Pango based scalable font renderer
Default is: unifont,pango
The 8x16 backend is always built-in.
--with-renderers: Console rendering backends. Available are:
- bbulk: Simple 2D software-renderer (bulk-mode)
- gltex: OpenGLESv2 accelerated renderer
- cairo: cairo based renderer
- pixman: pixman based renderer
Default is: bbulk,gltex
The bblit backend is always built-in.
--with-sessions: Built in sessions. Available sessions are:
- dummy: Dummy fallback session
- terminal: Terminal-emulator sessions
- cdev: Fake VTs via CUSE (DEPRECATED! Don't use it!)
The following options select which applications are built. If
dependency-checks fail, they are disabled by default unless explicitly enabled
on the command line:
--enable-kmscon: Build kmscon application [default: on]
--enable-wlterm: Build wlterm Wayland terminal [default: off]
--enable-eloop: Build eloop event loop library [default: off]
--enable-tsm: Build TSM terminal state-machine library [default: off]
--enable-uterm: Build uterm library [default: off]
--enable-uvt: Build UVT library [default: off]
== Running ==
To get usage information, run:
$ ./kmscon --help
You can then run kmscon with:
$ ./kmscon [options]
For debug output use "--debug". For verbose output use "--verbose".
With "--xkb-layout=<lang>" you can switch the keyboard layout.
See "man kmscon" / kmscon(1) for more information.
== License ==
This software is licensed under the terms of an MIT-like license. Please see
./COPYING for further information.
== FAQ ==
Please see
== Contact ==
This software is maintained by:
David Herrmann <>
If you have any questions, do not hesitate to contact one of the maintainers.
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