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Windows 7: Issue with HDMI sound detection - unusual situation

18 Nov 2011   #1

Windows 7 ultimate x64
Issue with HDMI sound detection - unusual situation

Good day,

I have an unusual situation with my HDMI and would like some advice or ideas.

I have 2 TVs with HDMI input, both LG (I believe 32LH20R and 22LH20R).

When I connect my hdmi to 22lh20r, the sound device says "not connected".
When I connect to 32lh20r, everything works fine.
If I connect to 22lh20r after connecting to 32lh20r, the sound device is now detected!
But when I reset my computer, the sound from 22lh20r says "not connected" again.

I tested two notebooks on it so far, and could reproduce on both. One with a GeForce 9600M GT and the other with a GeForce GT 540M.

I think that this could be some issue with the TV, but since it work after connecting to the other TV, I was thinking if there is a way to force the detection, or to force the driver from one TV to the other, or something like that.

Thanks in advance.

My System SpecsSystem Spec
18 Nov 2011   #2

Windows 7 ultimate x64

Additional information:

I tryed to override EDID, with phoenix edid editor and monitor asset manager, but had no success with that. Turns out that they only collect the first 128 bytes from the edid, leaving the CEA extensions out, and this would be where the EDID stores whether the monitor has audio or not. =/

Also, it seems like it's not possible to "force" the playback device to "be detected", or at least I didn't find a way so far.

If anyone could help with EDID overriding, or this way to trick windows into believing HDMI sound is connected, I would appreciate a lot!

My System SpecsSystem Spec
19 Nov 2011   #3

Windows 7 ultimate x64

Found a solution that worked:

Since the EDID from the other TV worked for the problematic one, I used MonInfo (monitor asset) to create a .inf file from the real time EDID from the TV that was working, and used it to override the EDID for the TV. The real time one got the CEA extension, so that made the sound work.

The wierd part is that I kept on trying a few other things, and after using Powerstrip, somehow the EDID from TV came back to life and now I don't need the driver anymore. I believe powerstrip did something there, but I really don't know what happened. But well, the previous one was a solution too.

I'll leave the monitor.inf file attached here in case someone need the EDID Override for these TV sets, since LG won't get you one in case your TV decide to malfunction. The models are 22LH20R and 32LH20R, and I believe it will work for any HD Ready TV from LG.

Attached Files
File Type: zip (1.2 KB, 141 views)
My System SpecsSystem Spec


 Issue with HDMI sound detection - unusual situation

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