web_Linux_EDID_Config

Sample Advanced EDID Configurations

The edid_avail and edid_not_avail parameters control the available timings for any display. Use the edid_avail parameter when reading EDID information from the display. If the driver is unable to read EDID information from the display, or if the edid parameter in the config file is set to “0” (disable), use the settings of the edid_not_avail parameter.

An edid option can be placed in the xorg.conf to control the behavior of the overall driver. EDID settings also exist within CED that control the behavior on each port (edid, edid_avail, and edid_not_avail). The combination of these settings determines how the driver behaves. The table below shows various configurations and the expected behavior of the driver.

Sample Advanced EDID Configurations

Case

CED: Per port “edid” option

Expected driver behavior

1.

No edid flag specified

For every port, driver uses edid_avail.

2.

edid=0 for some ports and edid=1 for some ports

For edid=0 ports, driver uses edid_not_avail flags.

For edid=1 ports driver uses edid_avail flags.

3.

Setting does not matter.

For all ports driver will not read edid and interprets edid_not_avail flags.

Driver overrides any per-port edid flags, treats all displays as EDID-less displays, and uses edid_not_avail flags.

4.

edid=0 for some ports and edid=1 for some ports

Same as case 2

Notes: For all cases:

1. If there is not an edid_not_avail flag specified for a port, and an EDID-less display is detected, the driver defaults to using the standard built-in timings for that port.

2. If there is not an edid_avail flag specified for a port, and an EDID display is detected, the driver defaults to using the EDID data from the display, plus any user-specified DTDs.

3. If edid=1 and the display device is EDID-less, the driver uses edid_not_avail flags.




*Other names and brands may be claimed as the property of others.
Revised May 2011