Ubuntu Manpage: splash — splash screen / screen saver interface

Provided by: freebsd-manpages_12.2-2_all

NAME

     splash — splash screen / screen saver interface

SYNOPSIS

     device splash

DESCRIPTION

The splash pseudo device driver adds support for the splash screen and screen savers to the
kernel. This driver is required if the splash bitmap image is to be loaded or any screen
saver is to be used.

Splash screen
You can load and display an arbitrary bitmap image file as a welcome banner on the screen
when the system is about to start. This image will remain on the screen during kernel
initialization process until the login prompt appears on the screen or until a screen saver
is loaded and initialized. The image will also disappear if you hit any key, although this
may not work immediately if the kernel is still probing devices.

If you specify the -c or -v boot option when loading the kernel, the splash image will not
appear. However, it is still loaded and can be used as a screen saver later: see below.

In order to display the bitmap, the bitmap file itself and the matching splash image decoder
module must be loaded by the boot loader. Currently the following decoder modules are
available:

splash_bmp.ko Windows BMP file decoder. While the BMP file format allows images of
various color depths, this decoder currently only handles 256 color bitmaps.
Bitmaps of other color depths will not be displayed.
splash_pcx.ko ZSoft PCX decoder. This decoder currently only supports version 5 8-bpp
single-plane images.
splash_txt.ko TheDraw binary ASCII drawing file decoder. Displays a text-mode 80x25 ASCII
drawing, such as that produced by the Binary save format in TheDraw. This
format consists of a sequence of two byte pairs representing the 80x25
display, where the first byte is the ASCII character to draw and the second
byte indicates the colors/attributes to use when drawing the character.

The EXAMPLES section illustrates how to set up the splash screen.

If the standard VGA video mode is used, the size of the bitmap must be 320x200 or less. If
you enable the VESA mode support in the kernel, either by statically linking the VESA module
or by loading the VESA module (see vga(4)), you can load bitmaps up to a resolution of
1024x768, depending on the VESA BIOS and the amount of video memory on the video card.

Screen saver
The screen saver will activate when the system is considered idle: i.e. when the user has
not typed a key or moved the mouse for a specified period of time. As the screen saver is
an optional module, it must be explicitly loaded into memory. Currently the following
screen saver modules are available:

blank_saver.ko This screen saver simply blanks the screen.
beastie_saver.ko Animated graphical BSD Daemon.
daemon_saver.ko Animated BSD Daemon screen saver.
dragon_saver.ko Draws a random dragon curve.
fade_saver.ko The screen will gradually fade away.
fire_saver.ko A fire which becomes higher as load increases.
green_saver.ko The screen will be blanked, similar to blank_saver.ko. If the monitor and
the video card's BIOS support it the screen will also be powered off.
logo_saver.ko Animated graphical FreeBSD logo.
plasma_saver.ko Draws an animated interference pattern.
rain_saver.ko Draws a shower on the screen.
snake_saver.ko Draws a snake of string.
star_saver.ko Twinkling stars.
warp_saver.ko Streaking stars.

Screen saver modules can be loaded using kldload(8):

kldload logo_saver

The timeout value in seconds can be specified as follows:

vidcontrol -t N

Alternatively, you can set the saver variable in the /etc/rc.conf to the screen saver of
your choice and the timeout value to the blanktime variable so that the screen saver is
automatically loaded and the timeout value is set when the system starts.

The screen saver may be instantly activated by hitting the saver key: the defaults are
Shift-Pause on the AT enhanced keyboard and Shift-Ctrl-NumLock/Pause on the AT 84 keyboard.
You can change the saver key by modifying the keymap (see kbdcontrol(1), keymap(5)), and
assign the saver function to a key of your preference.

The screen saver will not run if the screen is not in text mode.

Splash screen as a screen saver
If you load a splash image but do not load a screen saver, you can continue using the splash
module as a screen saver. The screen blanking interval can be specified as described in the
Screen saver section above.

FILES

     /boot/defaults/loader.conf   boot loader configuration defaults
     /etc/rc.conf                 system configuration information
     /boot/kernel/splash_*.ko     splash image decoder modules
     /boot/kernel/*_saver.ko      screen saver modules
     /boot/kernel/vesa.ko         the VESA support module

EXAMPLES

     In order to load the splash screen or the screen saver, you must have the following line in
     the kernel configuration file.

           device splash

     Next, edit /boot/loader.conf (see loader.conf(5)) and include the following lines:

           splash_bmp_load="YES"
           bitmap_load="YES"
           bitmap_name="/boot/chuck.bmp"

     In the above example, the file /boot/chuck.bmp is loaded.  In the following example, the
     VESA module is loaded so that a bitmap file which cannot be displayed in standard VGA modes
     may be shown using one of the VESA video modes.

           splash_pcx_load="YES"
           vesa_load="YES"
           bitmap_load="YES"
           bitmap_name="/boot/chuck.pcx"

     If the VESA support is statically linked to the kernel, it is not necessary to load the VESA
     module.  Just load the bitmap file and the splash decoder module as in the first example
     above.

     To load a binary ASCII drawing and display this while booting, include the following into
     your /boot/loader.conf:

           splash_txt_load="YES"
           bitmap_load="YES"
           bitmap_name="/boot/splash.bin"

HISTORY

     The splash driver first appeared in FreeBSD 3.1.

AUTHORS

     The splash driver and this manual page were written by Kazutaka Yokota <yokota@FreeBSD.org>.
     The splash_bmp module was written by Michael Smith <msmith@FreeBSD.org> and Kazutaka Yokota.
     The splash_pcx module was written by Dag-Erling Smørgrav <des@FreeBSD.org> based on the
     splash_bmp code.  The splash_txt module was written by Antony Mawer <antony@mawer.org> based
     on the splash_bmp code, with some additional inspiration from the daemon_saver code.  The
     logo_saver, plasma_saver, rain_saver and warp_saver modules were written by Dag-Erling
     Smørgrav <des@FreeBSD.org>.

CAVEATS

     Both the splash screen and the screen saver work with syscons(4) only.

BUGS

     If you load a screen saver while another screen saver has already been loaded, the first
     screen saver will not be automatically unloaded and will remain in memory, wasting kernel
     memory space.