Dedicated ARC Genesis thread - AVS Forum
Before ARC genesis, I found these discussions very helpful in adjusting ARC 2, however they don't really seem to apply much to ARC genesis. Although I am happy with the initial results from ARC Genesis, I am also interested in trying adjustments and learning what other users have tried and what their results are.

Solution to Onkyo TX-NR636 ARC no audio problem - AVS Forum
Many people have been reporting getting no audio over ARC. I spoke to an Onkyo engineer, and she figured it out. The receiver was "losing" the TV. In order to fix it, I simply had to go into the receiver's menus, turn RHID off, and back on again. But it has to be done in a specific order for it to work. 1. Go into Hardware Setup. 2. Select HDMI 3.

Denon ARC trouble - AVS Forum
Make sure you have an HDMI cable that supports Ethernet. ARC and Ethernet were introduced in HDMI 1.4, (2009, most cables must support it by now) Cables that support ARC usually mention only that they support Ethernet, but they will support ARC as well. Then encouragement and misc. details: I have an LG OLED B6 and an AV7704.

Dolby Digital Plus (DD+) / Atmos over HDMI ARC - AVS Forum
This means, an ARC source (TV) can determine which audio formats are understood by the ARC receiver (AVR, Soundbar), while an SPDIF source can just try and send stuff and hope for the best. Mainly for this reason, SPDIF is usually limited to the 48 kHz realm (DD, DTS and stereo PCM), and often can not support the 96 and 192 kHz formats (96 kHz ...

Marantz ARC Not Working - AVS Forum
A while back I was using this Black Friday Samsung receiver for my home theater. It was not anything serious, but it got the job done. With that, I was able to connect one HDMI from my Sony 4K's ARC designated port, to the ARC designated output on the Samsung receiver. The TV would then send all the sound to the receiver and it worked flawlessly.

HDMI ARC problems with Pioneer Receiver and Samsung...
ARC/CEC is a problem for a lot of folks because of the inconsistent way ARC is implemented across various mfrs. All of your devices need to be ARC capable for it to work so check to see if that is true. If it is, and you still can't get a single remote to work, then I would disable ARC on all of your devices and try a programmable remote.

HDMI ARC issues with Samsung Tv and Onkyo Reciver.
ARC is still quite often associated with CEC (same chipsets) so issues with CEC can and will affect ARC. CEC is not a standardized option so the device mfrs are free to implement however they choose to do so, which quite often creates incompatibilities and inconsistencies.

ARC TV and a Non ARC Sound Receiver - AVS Forum
An ARC-enabled AVR will have a menu option to allow selection of standard HDMI audio or the ARC audio for the HDMI input dedicated to ARC. If your AVR is not ARC-enabled, you can get the same audio by connecting an optical (or coax, if available) digital audio output from the TV to the AVR, as Otto mentioned.

ARC with HDMI over Ethernet - AVS Forum
I'd like to run my 4k Samsung 8000 series TVs audio to the Denon AVR-1913 with ARC, but when I follow all steps no audio comes through surround sound. Receiver audio Works for other devices like ps5 or Apple TV 4K through receiver just not anything ARC. And if I unplug the HDMI receiver from TV audio works through TV.

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