generic video card interface
driver is a generic video card driver
which provides access to video cards. This driver is required for the console
The console driver will call the
to manipulate video hardware (changing video modes, loading font, etc).
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, the
option (see below) must be defined in
the kernel configuration file.
module can be dynamically loaded
into the kernel using
The following kernel configuration options (see
can be used to control the
These options provide compatibility with certain VGA cards.
- 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.
- 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.
- 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 options add optional features to the driver.
- 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.
- Set the VESA support debug level to N.
The default value is zero, which suppresses all debugging output.
The following options will remove some features from the
driver and save kernel memory.
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
- This option prevents the driver from changing video modes.
Your kernel configuration should normally have:
And you need the following line in
The following lines should be included in the kernel configuration file in order
to enable the VESA BIOS Extension support.
If you do not want VESA support included in the kernel, but want to use
occasionally, do not add the
And load the
module as desired:
Video Electronics Standards
Association, VESA BIOS Extension (VBE).
driver first appeared in
driver was written by
and Kazutaka Yokota
This manual page was written by Kazutaka