LVDS and DP through i2c

Graeme Gill graeme2 at
Mon Dec 27 21:16:28 PST 2010

Alex Deucher wrote:

 > i2c bit algo hooks.  Next, make sure you are opening the correct i2c
 > bus.   On radeons, we expose all of the on board i2c buses.  In most
 > cases, each connector uses a different i2c bus and there are

If it's all too hard to actually put the i2c interface into the XRandR I/F,
how about at least making sure that the display i2c device name is set as
an output property ? That way there wouldn't need to be any guessing,
or require some user action for software to talk to the display associated
with a particular output. The property name needs to be standardised too,
"OUTPUT_I2C_DEVICE_NAME", or something.

[And what are the permissions on the i2c device ? Does the user have
  to jump through hoops for the application to actually do I/O ? If so,
  is there a means to add the display output i2c device to udev ? ]

Graeme Gill.

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