VGA distributor hardware detection


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# 1  
Old 02-07-2018
VGA distributor hardware detection

Hi,

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.

Any help or suggestion is highly appreciated. Smilie



Thanks
# 2  
Old 02-07-2018
I am fairly certain what you want isn't possible with a VGA distributor. You'd need separate video cards to get different EDID data through each.
This User Gave Thanks to Corona688 For This Post:
diehard (02-07-2018)
# 3  
Old 02-07-2018
Thanks.

Is there any other method to identified if VGA distributor is connected to my system Or Any method to forcefully generate edid file.
# 4  
Old 02-07-2018
Attach only one monitor at a time, have the edid file created at startup, and save it with a meaningful name.
I'd guess that with multiple monitors attached via a distributor the info (if any!) flowing back to the host will be promiscuous and ambiguous due to collisions.
# 5  
Old 02-07-2018
Quote:
Originally Posted by diehard
Is there any other method to identified if VGA distributor is connected to my system
No.
Quote:
Or Any method to forcefully generate edid file.
Pretty much "do it yourself".

Perhaps you could disable detection and use a profile you know works for all monitors.
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