ARC is not the panacea everyone thought it would be (or what the typical salesperson would lead you to believe). It was a good idea executed poorly to the point that even if your gear supports it, it may not work (it almost never works between components of different brands). Don't sweat that you can't use it - it only saves you one cheap toslink cable anyway.
Your TV will dumb down any digital multichannel audio from external sources to 2.0 before the signal is output to your AVR. You should keep all your devices connected directly to the AVR. If you really don't want to run a Toslink between the TV and AVR for your cable audio, then your only option is to get a STB from your provider. This would have an HDMI output, then you can run that direct to the AVR too and you're done.
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