1.\" 2.\" Copyright (c) 1999 3.\" Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer as 11.\" the first lines of this file unmodified. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/share/man/man4/vga.4,v 1.7.2.10 2002/12/20 18:03:05 trhodes Exp $ 28.\" $DragonFly: src/share/man/man4/vga.4,v 1.2 2003/06/17 04:36:59 dillon Exp $ 29.\" 30.Dd June 30, 1999 31.Dt VGA 4 32.Os 33.Sh NAME 34.Nm vga 35.Nd generic video card interface 36.Sh SYNOPSIS 37.Cd "options VESA" 38.Cd "options VESA_DEBUG=N" 39.Cd "options VGA_ALT_SEQACCESS" 40.Cd "options VGA_NO_FONT_LOADING" 41.Cd "options VGA_NO_MODE_CHANGE" 42.Cd "options VGA_SLOW_IOACCESS" 43.Cd "options VGA_WIDTH90" 44.Cd "device vga0 at isa? port ? 45.Sh DESCRIPTION 46The 47.Nm 48driver is a generic video card driver which provides access to 49video cards. This driver is required for the console driver 50.Xr syscons 4 . 51The console driver will call the 52.Nm 53driver to manipulate video hardware (changing video modes, loading font, etc). 54.Pp 55The 56.Nm 57driver supports the standard video cards: MDA, CGA, EGA and VGA. 58In 59addition, the driver can utilize VESA BIOS extensions if the video card 60supports them. 61VESA support can either be statically included in the kernel 62or can be loaded as a separate module. 63.Pp 64In order to statically link the VESA support to the kernel, the 65.Dv VESA 66option (see below) must be defined in the kernel configuration file. 67.Pp 68The 69.Nm vesa 70module can be dynamically loaded into the kernel using 71.Xr kldload 8 . 72.Sh DRIVER CONFIGURATION 73.Ss Kernel Configuration Options 74The following kernel configuration options 75(see 76.Xr config 8 ) 77can be used to control the 78.Nm 79driver. 80These options provide compatibility with certain VGA cards. 81.Bl -tag -width MOUSE 82.It Dv VGA_ALT_SEQACCESS 83You may want to try this option if the mouse pointer is not drawn correctly 84or the font does not seem to be loaded properly on the VGA card. 85However, it may cause flicker on some systems. 86.It Dv VGA_SLOW_IOACCESS 87Older VGA cards may require this option for proper operation. 88It makes the driver perform byte-wide I/O to VGA registers and 89slow down a little. 90.It Dv VGA_WIDTH90 91This option enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60. 92These modes are not always supported by the video card and the display. 93It is highly likely that LCD display cannot work with these modes. 94.El 95.Pp 96The following options add optional features to the driver. 97.Bl -tag -width MOUSE 98.It Dv VESA 99Add VESA BIOS support to the driver. 100If the VGA card has the VESA BIOS extension 1.2 or later, 101this option will utilize the VESA BIOS service to switch to high 102resolution modes. 103.It Dv VESA_DEBUG=N 104Set the VESA support debug level to 105.Fa N . 106The default value is zero, which suppresses all debugging output. 107.El 108.Pp 109The following options will remove some features from the 110.Nm 111driver and save kernel memory. 112.Bl -tag -width MOUSE 113.It Dv VGA_NO_FONT_LOADING 114The 115.Nm 116driver can load software font to EGA and VGA cards. 117This option removes this feature. 118Note that if you use this option and 119still wish to use the mouse on the console then you must also use the 120.Dv SC_ALT_MOUSE_IMAGE 121option. See 122.Xr syscons 4 . 123.It Dv VGA_NO_MODE_CHANGE 124This option prevents the driver from changing video modes. 125.El 126.\".Sh FILES 127.Sh EXAMPLES 128Your kernel configuration should normally have: 129.Pp 130.Dl "device vga0 at isa? port ? 131.Pp 132The following lines should be included in the kernel configuration file 133in order to enable the VESA BIOS Extension support. 134.Pp 135.Dl "options VESA" 136.Dl "device vga0 at isa? port ? 137.Pp 138If you do not want VESA support included in the kernel, but 139want to use occasionally, do not add the 140.Dv VESA 141option. And load the 142.Nm vesa 143module as desired: 144.Pp 145.Dl kldload vesa 146.Pp 147.\".Sh DIAGNOSTICS 148.\".Sh CAVEATS 149.\".Sh BUGS 150.Sh SEE ALSO 151.Xr vgl 3 , 152.Xr syscons 4 , 153.Xr config 8 , 154.Xr kldload 8 , 155.Xr kldunload 8 156.Sh STANDARDS 157.Rs 158.%T "VESA BIOS Extension (VBE)" 159.%A Video Electronics Standards Association 160.Re 161.Sh HISTORY 162The 163.Nm 164driver first appeared in 165.Fx 3.1 . 166.Sh AUTHORS 167.An -nosplit 168The 169.Nm 170driver was written by 171.An S\(/oren Schmidt Aq sos@FreeBSD.org 172and 173.An Kazutaka Yokota Aq yokota@FreeBSD.org . 174This manual page was written by 175.An Kazutaka Yokota . 176