.\"     $OpenBSD: pnozz.4,v 1.29 2008/03/31 07:44:30 jmc Exp $
.\"
.\" Copyright (c) 1999 Jason L. Wright (jason@thought.net)
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
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.Dd $Mdocdate: March 31 2008 $
.Dt PNOZZ 4 sparc
.Os
.Sh NAME
.Nm pnozz
.Nd Weitek Power9100 accelerated frame buffer
.Sh SYNOPSIS
.Cd "pnozz0 at sbus?"
.Cd "wsdisplay* at pnozz?"
.Sh DESCRIPTION
The
.Nm
is a color frame buffer with graphics acceleration, embedded in the
.Tn Tadpole SPARCbook
3GS, 3GX, 3TX and 3XP
laptops.
It is based on the
.Tn Weitek Power9100
video processor and an
.Tn IBM RGB525
RAMDAC.
.Pp
The
.Nm
driver interfaces the frame buffer with the
.Xr wscons 4
console framework.
It does not provide direct device driver entry points
but makes its functions available via the internal
.Xr wsdisplay 4
interface.
.Pp
If the
.Xr tctrl 4
device is also configured, the
.Nm
will be powered down when the lid of the laptop
is closed or the screen is blanked.
.Pp
On machines with an 800 pixel wide display, the
.Nm
driver supports hardware acceleration to erase the screen and scroll text.
.\" By default, acceleration is
.\" .Em not
.\" enabled.
.\" By setting
.\" .Ar flags
.\" to 1
.\" (via
.\" .Xr config 8
.\" or
.\" .Xr boot_config 8 )
.\" this acceleration can be enabled.
.Sh EXTERNAL VIDEO
If the
.Xr tctrl 4
device is also configured, the external video output will be enabled when
an external display is connected, even if the laptop lid is closed.
.Sh SEE ALSO
.Xr intro 4 ,
.Xr sbus 4 ,
.Xr wscons 4 ,
.Xr wsdisplay 4
.Sh BUGS
It is not possible yet to change display resolution or color depth.
.\" Actually, it is... but not yet hooked to wsconsctl
.Pp
Acceleration code does not work correctly on 640 pixel wide displays,
such as on model 3XP, and is therefore disabled in this case.