downgrade works fine, it’s just an extra step, and it’s good for “newbies” to know how to install package files directly with pacman.
I do see some files like linux-lts-5.10.79-1-x86_64.pkg.tar.zst and linux-lts-5.15.5.arch1-1-x86_65.pkg.tar.zst
So with the downgrade command I should downgrade to 276 in my case?
Should I use pacman -U instead?
Either will work. Given downgrade makes is explicit which package you’re installing, use that. Also keep in mind that you’ll need the matching linux-headers package too - if that’s not automatically installed make sure you downgrade that one too.
This might be a silly question to ask, but does it matter what order I downgrade linux and the linux-headers?
Headers first, otherwise DKMS will (might) fail to build modules for the downgraded kernel.
(Or, do them both at the same time if you can)
ok I downgraded both linux and linux-headers but the the ethernet is still giving me the same error. I also can’t connect my phone to my computer to have internet access on my pc anymore. it just tells me that “cable unplugged”
Did you reboot? You have to reboot to use the changed kernel.
Yes I did reboot. My mobile hotspot is working again after I reboot one more time, but I have no luck with the ethernet plugged into my motherboard
OK, that means it’s not the kernel and something else changed. You can update back to the current package state with pacman -Syu .
Does the Ethernet cable and port work with another system?
I assume this doesn’t affect Ethernet…
Have you made any other more interesting changes to your system that you haven’t mentioned yet?
Could it be zoom, snapd? etc
Thank you for saying this, it wasn’t working. I was just being dumb and I guess I had never seen what it looked like for my MoCA adapter to start acting up on linux and just figured that it was something that I did wrong when I was updating stuff.
Thank you for all the help and sorry for wasting your time @ricklinux
and @jonathon
I hope the both of you have a good rest of your day 
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Sometimes we overlook the simple things or overthink them. No worries. We all do it sometimes! 
I upgraded from linux-lts 5.10.82-1 to 5.10.83-1 and ran into the same issue as above where Ethernet didn’t work so I downgraded back to 82-1.
Some issues with new kernel that’s causing it.
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Very likely a different issue:
I didn’t touch the headers since the update was only for the LTS.
Do you have LTS installed? May be boot into that and see if it works?
You might have missed this part:
The issue seems to have been the Ethernet adapter, not the kernel update.