CGTHREE(4) | Device Drivers Manual (sparc64) | CGTHREE(4)

# NAME

`cgthree` — 8-bit color frame buffer

# SYNOPSIS

`cgthree* at sbus?`
`wsdisplay* at cgthree?`

# DESCRIPTION

The `cgthree` is an SBus color frame buffer.

The `cgthree` driver interfaces the frame buffer with the wscons(4) console framework. It does not provide direct device driver entry points but makes its functions available via the internal wsdisplay(4) interface.

# DISPLAY RESOLUTION

If the `cgthree` frame buffer is used as the console display, it is possible, for some models, to select a different resolution than the default 1152x900 or 1024x768 by changing the OpenPROM environment. To change the default resolution, type the following:

ok setenv output-device screen:r1152x900x66

to change to a 66Hz 1152x900 resolution.

If the `cgthree` frame buffer is a secondary display, or a serial console is used, the display resolution cannot be changed without using an nvramrc OpenPROM script. Refer to the Sun Frame Buffer FAQ for details.

The `cgthree` frame buffer accepts the following resolutions:

screen:r1024x768x77
  Super VGA 1024x768, with a refresh rate of 77Hz. This is the default setting on model 501-2691.
screen:r1152x900x66
  Standard 1152x900, with a refresh rate of 66Hz. This is the default setting on older models (501-1415 and 501-8044).
screen:r1152x900x76
  Standard 1152x900, with a refresh rate of 76Hz. This is the default setting on more recent models (501-1718 and 501-1909).

Note that not all models support settings other than their default setting.

# SEE ALSO

intro(4), sbus(4), wscons(4), wsdisplay(4)

Sun Frame Buffer FAQ, http://www.sunhelp.org/faq/FrameBuffer.html.

November 1, 2015 | Debian