1.\" $OpenBSD: cgthree.4,v 1.21 2008/03/31 08:12:22 jmc Exp $ 2.\" 3.\" Copyright (c) 2001 Jason L. Wright (jason@thought.net) 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. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 24.\" ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25.\" POSSIBILITY OF SUCH DAMAGE. 26.\" 27.Dd $Mdocdate: March 31 2008 $ 28.Dt CGTHREE 4 sparc64 29.Os 30.Sh NAME 31.Nm cgthree 32.Nd 8-bit color frame buffer 33.Sh SYNOPSIS 34.Cd "cgthree* at sbus?" 35.Cd "wsdisplay* at cgthree?" 36.Sh DESCRIPTION 37The 38.Nm 39is an SBus color frame buffer. 40.Pp 41The 42.Nm 43driver interfaces the frame buffer with the 44.Xr wscons 4 45console framework. 46It does not provide direct device driver entry points 47but makes its functions available via the internal 48.Xr wsdisplay 4 49interface. 50.Sh DISPLAY RESOLUTION 51If the 52.Nm 53frame buffer is used as the console display, it is possible, for some models, 54to select a different resolution than the default 1152x900 or 1024x768 55by changing the OpenPROM environment. 56To change the default resolution, type the following: 57.Pp 58.Em \ ok 59setenv 60.Em output-device 61screen:r1152x900x66 62.Pp 63to change to a 66Hz 1152x900 resolution. 64.Pp 65If the 66.Nm 67frame buffer is a secondary display, or a serial console is used, the 68display resolution can not be changed without using an 69.Em nvramrc 70OpenPROM script. 71Refer to the 72.Em Sun Frame Buffer FAQ 73for details. 74.Pp 75The 76.Nm 77frame buffer accepts the following resolutions: 78.Pp 79.Bl -tag -width screen:r1280x1024x76 -compact 80.It screen:r1024x768x77 81Super VGA 1024x768, with a refresh rate of 77Hz. 82This is the default setting on model 501-2691. 83.It screen:r1152x900x66 84Standard 1152x900, with a refresh rate of 66Hz. 85This is the default setting on older models (501-1415 and 501-8044). 86.It screen:r1152x900x76 87Standard 1152x900, with a refresh rate of 76Hz. 88This is the default setting on more recent models (501-1718 and 501-1909). 89.El 90.Pp 91Note that not all models support settings other than their default setting. 92.Sh SEE ALSO 93.Xr intro 4 , 94.Xr sbus 4 , 95.Xr wscons 4 , 96.Xr wsdisplay 4 97.Rs 98.%T Sun Frame Buffer FAQ 99.%O http://www.sunhelp.org/faq/FrameBuffer.html 100.Re 101