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VGA(4)                DragonFly Kernel Interfaces Manual                VGA(4)


NAME

     vga - generic video card interface


SYNOPSIS

     device vga0 at isa? port ?

     options VGA_KEEP_POWERON_MODE
     options VGA_NO_FONT_LOADING
     options VGA_NO_MODE_CHANGE
     options VGA_DEBUG=N
     options VGA_WIDTH90


DESCRIPTION

     The vga driver is a generic video card driver which provides access to
     video cards.  This driver is required for the syscons(4) console driver
     which will call the vga driver to manipulate video hardware (changing
     video modes, loading fonts, etc).

     The vga driver supports the standard VGA video cards.


DRIVER CONFIGURATION

     The following kernel configuration options can be used to control the vga
     driver.  These options provide compatibility with certain VGA cards.

     VGA_DEBUG=N                Set the VGA support debug level to N.  The
                                default value is 0, which suppresses all
                                debugging output.  A value of 2 gives maximum
                                verbosity.

     VGA_KEEP_POWERON_MODE      This option keeps the initial mode's register
                                settings for switching back to it from another
                                mode.

     VGA_WIDTH90                This option enables 90 column modes: 90x25,
                                90x30, 90x43, 90x50, 90x60.  These modes are
                                not always supported by the video card and the
                                display.  It is highly likely that LCD display
                                cannot work with these modes.

     The following option will remove some features from the vga driver and
     save kernel memory.

     VGA_NO_FONT_LOADING        This option removes font loading from the
                                driver.  Note that if you use this option and
                                still wish to use the mouse on the console
                                then you must also use the SC_ALT_MOUSE_IMAGE
                                option.  See syscons(4).

     VGA_NO_MODE_CHANGE         This option prevents the driver from changing
                                video modes.


SEE ALSO

     vgl(3), syscons(4)


STANDARDS

     Apple, IBM, Motorola, "Common Hardware Reference Platform: I/O Device
     Reference", Appendix A: VGA Programming Model,
     ftp://ftp.software.ibm.com/rs6000/technology/spec/chrp/, p. 195.


HISTORY

     The vga driver first appeared in FreeBSD 3.1.


AUTHORS

     The vga driver was written by Soren Schmidt <sos@FreeBSD.org> and
     Kazutaka Yokota <yokota@FreeBSD.org>.  This manual page was written by
     Kazutaka Yokota.

DragonFly 5.9-DEVELOPMENT        March 3, 2020       DragonFly 5.9-DEVELOPMENT

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