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Special Forums Hardware VGA distributor hardware detection Post 303012646 by diehard on Wednesday 7th of February 2018 07:54:41 AM
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
 

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SENSORS-DETECT(8)					      System Manager's Manual						 SENSORS-DETECT(8)

NAME
sensors-detect - detect hardware monitoring chips SYNOPSIS
sensors-detect DESCRIPTION
sensors-detect is an interactive program that will walk you through the process of scanning your system for various hardware monitoring chips, or sensors, supported by libsensors(3), or more generally by the lm_sensors tool suite. sensors-detect will look for the following devices, in order: o Sensors embedded in CPUs, south bridges and memory controllers. o Sensors embedded in Super I/O chips. o Hardware monitoring chips accessed through ISA I/O ports. o Hardware monitoring chips reachable over the SMBus or more generally any I2C bus on your system. As the last two detection steps can cause trouble on some systems, they are normally not attempted if the second detection step led to the discovery of a Super I/O chip with complete hardware monitoring features. However, the user is always free to ask for all detection steps if so is his/her wish. This can be useful if a given system has more than one hardware monitoring chip. Some vendors are known to do this, most notably Asus and Tyan. WARNING
sensors-detect needs to access the hardware for most of the chip detections. By definition, it doesn't know which chips are there before it manages to identify them. This means that it can access chips in a way these chips do not like, causing problems ranging from SMBus lockup to permanent hardware damage (a rare case, thankfully.) The authors made their best to make the detection as safe as possible, and it turns out to work just fine in most cases, however it is impossible to guarantee that sensors-detect will not lock or kill a specific system. So, as a rule of thumb, you should not run sensors- detect on production servers, and you should not run sensors-detect if can't afford replacing a random part of your system. Also, it is recommended to not force a detection step which would have been skipped by default, unless you know what you are doing. SEE ALSO
sensors(1), libsensors(3) AUTHOR
Frodo Looijaard and Jean Delvare lm-sensors 3 December 2008 SENSORS-DETECT(8)
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