SPLASH(4) BSD Kernel Interfaces Manual SPLASH(4)
splash -- splash screen / screen saver interface
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.
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
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. Cur-
rently the following decoder modules are available:
splash_bmp.ko W*ndows BMP file decoder. While the BMP file format allows images of various color depths, this decoder currently only han-
dles 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.
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.
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.
daemon_saver.ko Animated BSD Daemon screen saver.
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 BSD Daemon.
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):
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.
/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
In order to load the splash screen or the screen saver, you must have the following line in the kernel configuration file.
Next, edit /boot/loader.conf (see loader.conf(5)) and include the following lines:
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.
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.
Both the splash screen and the screen saver work with syscons(4) only.
vidcontrol(1), syscons(4), vga(4), loader.conf(5), rc.conf(5), kldload(8), kldunload(8)
The splash driver first appeared in FreeBSD 3.1.
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 Smorgrav <des@FreeBSD.org> based on the
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.
November 29, 2010 BSD