.\"	$OpenBSD: ifb.4,v 1.3 2008/03/31 08:03:31 jmc Exp $
.\"
.\" Copyright (c) 2008 Miodrag Vallat.
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies. And
.\" I won't mind if you keep the disclaimer below.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd $Mdocdate: March 31 2008 $
.Dt IFB 4 sparc64
.Os
.Sh NAME
.Nm ifb
.Nd inextricable frame buffer
.Sh SYNOPSIS
.Cd "ifb* at pci?"
.Cd "wsdisplay* at ifb?"
.Sh DESCRIPTION
The
.Nm
driver attempts to support various frame buffer cards based on the
3DLabs
.Sq Wildcat
chips, such as the
Sun
Expert3D
and
XVR-500
boards.
It does not provide direct device driver entry points
but makes its functions available via the internal
.Xr wsdisplay 4
interface.
.Sh DISPLAY RESOLUTION
If the
.Nm
frame buffer is used as the console display, a different resolution than
the default 1152x900 can be selected by changing the OpenPROM environment.
To change the default resolution, type the following:
.Pp
.Em \   ok
setenv
.Em output-device
screen:r1280x1024x76
.Pp
to change to a 76Hz 1280x1024 resolution.
.Pp
The
.Nm
frame buffer accepts the following resolutions:
.Bl -tag -width 5n -offset indent
.It screen:r640x480x60
VGA 640x480, with a refresh rate of 60Hz.
.It screen:r640x480x60i
VGA 640x480, with a refresh rate of 60Hz, interleaved.
.It screen:r768x575x50i
768x575, with a refresh rate of 50Hz, interleaved.
.It screen:r1024x768x60
Super VGA 1024x768, with a refresh rate of 60Hz.
.It screen:r1024x768x70
Super VGA 1024x768, with a refresh rate of 70Hz.
.It screen:r1024x768x75
Super VGA 1024x768, with a refresh rate of 75Hz.
.It screen:r1024x768x76
Super VGA 1024x768, with a refresh rate of 76Hz.
.It screen:r1024x768x77
Super VGA 1024x768, with a refresh rate of 77Hz.
.It screen:r1024x800x84
1024x800, with a refresh rate of 84Hz.
.It screen:r1152x900x66
Standard 1152x900, with a refresh rate of 66Hz.
.It screen:r1152x900x76
Standard 1152x900, with a refresh rate of 76Hz.
.It screen:r1280x800x76
1280x800, with a refresh rate of 76Hz.
.It screen:r1280x1024x60
High res 1280x1024, with a refresh rate of 60Hz.
.It screen:r1280x1024x67
High res 1280x1024, with a refresh rate of 67Hz.
.It screen:r1280x1024x76
High res 1280x1024, with a refresh rate of 76Hz.
.It screen:r1280x1024x85
High res 1280x1024, with a refresh rate of 85Hz.
.It screen:r1440x900x76
1440x900, with a refresh rate of 76Hz.
.It screen:r1600x1000x66
1600x1000, with a refresh rate of 66Hz.
.It screen:r1600x1000x76
1600x1000, with a refresh rate of 76Hz.
.It screen:r1600x1280x76
High res 1600x1280, with a refresh rate of 76Hz.
.It screen:r1792x1344x75
1792x1344, with a refresh rate of 75Hz.
.It screen:r1920x1080x72
1920x1080, with a refresh rate of 72Hz.
.It screen:r1920x1200x70
1920x1200, with a refresh rate of 70Hz.
.It screen:r1920x1200x75
1920x1200, with a refresh rate of 75Hz.
.El
.Sh SEE ALSO
.Xr intro 4 ,
.Xr pci 4 ,
.Xr wscons 4 ,
.Xr wsdisplay 4
.Sh BUGS
Overlay parasitic data appears above the displayed text.
This is especially visible in the lower left corner of the display.
This essentially makes this driver currently unusable.
.Pp
Vertical scrolling could be done in a much smoother way.