ddc(4) [netbsd man page]

DDC(4)							   BSD Kernel Interfaces Manual 						    DDC(4)

NAME

     ddc -- VESA Display Data Channel V2 devices

SYNOPSIS

     ddc at iic? addr 0x50

DESCRIPTION

     The ddc driver provides support for accessing the VESA Display Data Channel Version 2 supported by many video displays.

BUGS

     This driver does not provide any mechanism for access from user applications.  Its only use at this point is to provide a means for frame-
     buffer device drivers to query monitor description data (EDID) using a specialized in-kernel API.	No support for sending control commands to
     display devices is provided.

SEE ALSO

     iic(4), ddc(9), edid(9)

HISTORY

     The ddc device appeared in NetBSD 4.0.

AUTHORS

     Garrett D'Amore <gdamore@NetBSD.org>

BSD
								   May 11, 2006 							       BSD

get-edid(1)						      General Commands Manual						       get-edid(1)

NAME

       get-edid, parse-edid - read-edid tools to retrieve and interpret monitor specifications using the VESA VBE DDC protocol

SYNOPSIS

       get-edid | parse-edid
       get-edid > filename
       parse-edid < filename

DESCRIPTION

       The read-edid utility comprises two tools: get-edid and parse-edid.

       get-edid  uses  Linux's vm86(2) system call to enter virtual 8086 mode and perform Data Display Channel (DDC) transfers using the VESA BIOS
       Extensions (VBE) to retrieve information from monitors, including identification strings, supported sync ranges, available video modes, and
       video mode parameters.  Such information is often useful for configuring X Window System servers such as XFree86.

       The  data  obtained by get-edid is in a binary format, so the parse-edid command is available to interpret it and generate a human-readable
       block of text information that can also be included in an XFree86 XF86Config file.

       It is customary to invoke get-edid and parse-edid together in a pipeline.

       get-edid and parse-edid accept no options, recognize no environment variables, read no input files, and create no output files.

AUTHOR

       get-edid and parse-edid were written by John Fremlin, Dan Hugo, and Martin Kavalec, using the LRMI (Linux Real-Mode Interface)  library	by
       Josh Vanderhoof.  This manual page was written by Branden Robinson, originally for Debian GNU/Linux.

SEE ALSO

       vm86(2)

       John Fremlin's read-edid website <http://john.fremlin.de/programs/linux/read-edid/> at http://john.fremlin.de/programs/linux/read-edid/

Debian GNU/Linux						    2002-10-03							       get-edid(1)