Description of problem:
In some set-ups it is neccesary to override the EDID data supplied to the graphics card. A few scenarios are:
- KVM switches that filter the screens EDID data and refuse to offer high resolutions or wide-screen resolutions even if they work fine when forced through
- Long cables (20m or longer) where you may need to reduce max bandwith by removing access to the highest resolutions.


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:
Some easy, standard way to override the EDID information used by KMS and X.

I would propose a file /etc/sysconfig/EDID with a syntax that links entries to some hardware path (graphics controller and port name). A tool to edit the configuration would be nice. A set of standard values, and the ability to fetch the EDID data from the currently attached screen. I could then connect a screen directly to the PC, grab the EDID data and save it to the config file and hook up the KVM switch again.


Additional info: