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VGA(4) | Device Drivers Manual | VGA(4) |
NAME¶
vga — generic video card interfaceSYNOPSIS¶
options VESAoptions VESA_DEBUG=N
options VGA_ALT_SEQACCESS
options VGA_NO_FONT_LOADING
options VGA_NO_MODE_CHANGE
options VGA_SLOW_IOACCESS
options VGA_WIDTH90
device vga In /boot/device.hints:
hint.vga.0.at="isa"
DESCRIPTION¶
The vga driver is a generic video card driver which provides access to video cards. This driver is required for the console driver syscons(4). The console driver will call the vga driver to manipulate video hardware (changing video modes, loading font, etc). The vga driver supports the standard video cards: MDA, CGA, EGA and VGA. In addition, the driver can utilize VESA BIOS extensions if the video card supports them. VESA support can either be statically included in the kernel or can be loaded as a separate module. In order to statically link the VESA support to the kernel, theVESA
option (see below) must be defined in the kernel
configuration file.
The vesa module can be dynamically loaded into the kernel
using kldload(8).
DRIVER CONFIGURATION¶
Kernel Configuration Options¶
The following kernel configuration options (see config(8)) can be used to control the vga driver. These options provide compatibility with certain VGA cards.VGA_ALT_SEQACCESS
- You may want to try this option if the mouse pointer is not drawn correctly or the font does not seem to be loaded properly on the VGA card. However, it may cause flicker on some systems.
VGA_SLOW_IOACCESS
- Older VGA cards may require this option for proper operation. It makes the driver perform byte-wide I/O to VGA registers and slow down a little.
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.
VESA
- Add VESA BIOS support to the driver. If the VGA card has the VESA BIOS extension 1.2 or later, this option will utilize the VESA BIOS service to switch to high resolution modes.
VESA_DEBUG=N
- Set the VESA support debug level to N. The default value is zero, which suppresses all debugging output.
VGA_NO_FONT_LOADING
- The vga driver can load software font to
EGA and VGA cards. This option removes this feature. 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.
EXAMPLES¶
Your kernel configuration should normally have:device vga
hint.vga.0.at="isa"
options VESA
device vga
VESA
option. And load the
vesa module as desired:
kldload vesa
SEE ALSO¶
vgl(3), syscons(4), config(8), kldload(8), kldunload(8)STANDARDS¶
Video Electronics Standards Association, VESA BIOS Extension (VBE).HISTORY¶
The vga driver first appeared in FreeBSD 3.1.AUTHORS¶
The vga driver was written by Søren Schmidt ⟨sos@FreeBSD.org⟩ and Kazutaka Yokota ⟨yokota@FreeBSD.org⟩. This manual page was written by Kazutaka Yokota.June 30, 1999 | Debian |