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xcmddc(1) FreeBSD General Commands Manual xcmddc(1)

xcmddc - monitor EDID fetching over i2c

xcmddc [ -l [-v] ]
xcmddc [ -d POSITIONAL_NUMBER [--force-output] [--identify] ]
xcmddc [ --i2c NODE_NAME [--force-output] [--identify] ]
xcmddc [-h]

The xcmddc tool fetches a monitors EDID data block over a i2c communication channel.

list devices. Only devices which provide a EDID data block and the EDID's header is valid will be counted.
-v show each device by its node name.
position in device list. The numbering of monitors starts with zero for the first device. To get the number of all available devices use " xcmddc -l". The EDID data block is dumped to stdout.
--force-output switch EDID header verificatcationn off.
--identify dump the error code as integer to stdout.
--i2c=NODE_NAME , --i2c NODE_NAME
select the i2c device node file. The EDID data block is dumped to stdout. The --i2c option is much faster than the -d option. This is because of much fewer timeouts reuired for counting the valid i2c device with the -d option.
--force-output switch EDID header verification off.
--identify dump the error code as integer to stdout.

-v, --verbose
increase verbosity

Count available i2c->monitor devices:
xcmddc -l
List available i2c->monitor devices by name:
xcmddc -lv
Dump EDID from first i2c node:
xcmddc -d 0
Dump EDID by i2c device name:
xcmddc --i2c /dev/i2c-5
Print a help text:
xcmddc -h

Kai-Uwe Behrmann (ku.b (at)

(c) 2010, Kai-Uwe Behrmann
License: MIT <>

xcmedid(1) xcmevents(1) libXcm(3) XcmDDC(3)

November 22, 2016 User Commands

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