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TOPIC: Corrupted edid through nanoavr hda

Corrupted edid through nanoavr hda 8 months 1 week ago #40029

  • julienblanc
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I’m encountering issues with edid negociation when the hdmi signal go through the nano avr hda.

The setup is the following :
* 2 sources, each connected to the nano avr hda, with hdmi cables about 1.5m length
* a blu-ray player
* a home theater pc, running linux (debian), with an AMD radeon graphics card
* the nano avr hda
* a Toshiba TV, connected to the nano avr output with a 1,5m length cable

The issue is the following :
* very often (but strangely, not always), the htpc has a lot of trouble handling both sound and resolution on its output. In that case, get-edid fails. It gets worse with the latest driver update (open source driver)
* the blu-ray player is ok with the same setup (tried to switch cables and entries, no changes)

I suspected the (cheap) cables, so i replaced them with brand (phillips) ones, it didn't change anything. I tried using a laptop instead of the HTPC, and my laptop returned an edid error :
i915 0000:00:02.0: HDMI-A-1: EDID is invalid:
[ 1376.133315] 	[00] BAD  00 ff ff ff ff ff ff 00 52 62 0e 01 01 01 01 01
[ 1376.133317] 	[00] BAD  ff 16 01 03 80 66 39 78 0a 0d c9 a0 57 47 98 27
[ 1376.133318] 	[00] BAD  12 48 4c 2f cf 00 81 80 01 01 01 01 01 01 01 41
[ 1376.133320] 	[00] BAD  01 11 01 05 01 01 0a 3a 80 d0 72 38 2d 40 10 2c
[ 1376.133321] 	[00] BAD  45 80 fa 3d 32 00 00 1e 66 21 50 b0 51 00 1b 30
[ 1376.133323] 	[00] BAD  40 70 36 00 f6 3d 32 00 08 1e 00 00 00 fc 00 54
[ 1376.133324] 	[00] BAD  4f 53 48 49 42 41 2d 54 d6 0a 20 20 00 00 00 fd
[ 1376.133325] 	[00] BAD  00 17 4c 0f 51 0f 00 0a 20 20 20 20 20 20 01 87

For some reason, it worked with the same laptop under windows, so i guess the windows driver is more fault tolerant regarding edid issues (same as the bluray player).

I checked that everything is normal when connected directly to the TV (ie, the TV is sending a valid edid signal).

Is there anything that can be done to fix this issues ?
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Corrupted edid through nanoavr hda 8 months 1 week ago #40030

  • rhollan
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All I can say is that in my experience the nanoAVRs reflect the EDID presented by the device on output to their inputs (well, I have only ever connected to input 1, but I presume input 2 would be identical). It has to since it does not scale.
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Corrupted edid through nanoavr hda 8 months 1 week ago #40037

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Yes, that’s what i see when it works. The problem is that most of the time, the edid is corrupted (which cause issues on some devices, but not on all).
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Corrupted edid through nanoavr hda 8 months 1 week ago #40040

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I'd normally say check your cables: EDID is carried over DDC which is just a longish I2C bus, which was never designed to be long (400 pF max capacitance, increased to 700 pF for DDC), but they are short. Nevertheless, if you can swap cables, try. I've had apparently good cables be "less than good".
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Corrupted edid through nanoavr hda 8 months 1 week ago #40046

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Already triple checked the cables, swapped nearly everything that could be swapped. Direct connection between the TV and any source that has issues with the minidsp works fine, with exactly the same cable, in the same environment.

I was wondering if the extra length of using two cables (although i use 1.5m cables, so the total length is 3m, no so much) could be an issue, but my understanding is that the minidsp sends the edid all the time, whether the source is active or not : this means that the edid is read by the minidsp unit and then sent back to each source, so the signal level should be nominal again.

I was considering buying something like this : www.castorama.fr/adaptateur-hdmi-femelle...00101279042_CAFR.prd to definitely test if the cables are to blame, but since the problem occurs with a lot of different cables, i doubt it.
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Corrupted edid through nanoavr hda 8 months 6 days ago #40098

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@julienblanc

Did you start a tech support ticket about this question to get support from our team? As per the bold statement at the top of all forum pages, this is only a community forum (for help by community). We have an HDMI logger. Simply start a tech support tix (support.minidsp.com), we'd be happy to get some logs of your system.

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Corrupted edid through nanoavr hda 8 months 5 days ago #40105

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Seems like i forgot the basics.

Just sent you a support request (Case #53062).

Regards, and thanks for your support
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