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VGA distributor hardware detection


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    #1  
Old 02-07-2018
diehard diehard is offline
Registered User
 
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.



Thanks
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    #2  
Old 02-07-2018
Corona688 Corona688 is offline Forum Staff  
Mead Rotor
 
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.
The Following User Says Thank You to Corona688 For This Useful Post:
diehard (02-07-2018)
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    #3  
Old 02-07-2018
diehard diehard is offline
Registered User
 
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
RudiC RudiC is offline Forum Staff  
Moderator
 
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.
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    #5  
Old 02-07-2018
Corona688 Corona688 is offline Forum Staff  
Mead Rotor
 
Quote:
Originally Posted by diehard View Post
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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