I am trying to find the monitor information attach to my system. To get the detail I have decoded the information available in edid file using edid-decode utility.
The file is available at /sys/devices/pci0000:00/0000:00:01.0/drm/card0/card0-VGA-1/edid
After decoding edid file I get the attached monitor details. Now I have situation where I am using VGA distributor which split the signal and I can connect multiple monitor through it.After doing this I am still getting the same monitor information in my edid file.Second monitor detail is missing from it. I try to restart the system and found that file empty edid file is generated if two monitor is connected.
I have concluded that after starting the system some utility is actually creating the edid file but I am not sure which one is doing this.
Can anyone let me know how to detect if multiple monitor is connected to my system through VGA distributor ? I am using Ubuntu 14.04 on HP machine.