After installation, I was faced with the fact that the connection quality became very poor. Many sites do not want to load, the programs that I download via pacman download very slowly, although other devices work very well. Who knows how to fix this problem? Maybe I can change something in the configuration files. I will be grateful for any help.
Kernel version: 5.16.15-arch1-1
First of all, we need some hardware info:
inxi -Fxxc0z --no-host | eos-sendlog
Sure, https://clbin.com/6OJiZ
I don’t have a solution, but have the same wifi module in an old Dell laptop,
It was working okay in the past but have issues like you have.
It should work since the driver is in the kernel since 3.17
I ditched Arch (on that specific laptop) and installed Fedora to see if this would make a change and it does.
It seems like a bug in the latest kernel version.
https://bugzilla.kernel.org/show_bug.cgi?id=215703
For now you may want to downgrade the kernel to 15.16.14.
Same problem here.
Qualcomm Atheros AR9485 Wireless Network Adapter driver: ath9k
journalctl log full of:
Mar 25 14:43:45 rock NetworkManager[420]: <info> [1648233825.0758] dhcp4 (wlan0): state changed new lease, address=192.168.1.64
Mar 25 14:43:48 rock NetworkManager[420]: <info> [1648233828.1154] dhcp6 (wlan0): state changed new lease, address=2600:1700:5f40:f3d0::544
Mar 25 14:44:05 rock NetworkManager[420]: <info> [1648233845.7751] dhcp4 (wlan0): canceled DHCP transaction
Mar 25 14:44:05 rock NetworkManager[420]: <info> [1648233845.7752] dhcp4 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Mar 25 14:44:05 rock NetworkManager[420]: <info> [1648233845.7752] dhcp4 (wlan0): state changed no lease
Mar 25 14:44:05 rock NetworkManager[420]: <info> [1648233845.7757] dhcp6 (wlan0): canceled DHCP transaction
Mar 25 14:44:05 rock NetworkManager[420]: <info> [1648233845.7757] dhcp6 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Mar 25 14:44:05 rock NetworkManager[420]: <info> [1648233845.7757] dhcp6 (wlan0): state changed no lease
Mar 25 14:57:01 rock NetworkManager[420]: <info> [1648234621.1443] dhcp4 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Mar 25 14:57:01 rock NetworkManager[420]: <info> [1648234621.1570] dhcp4 (wlan0): state changed new lease, address=192.168.1.64
Mar 25 14:57:03 rock NetworkManager[420]: <info> [1648234623.4519] dhcp6 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Mar 25 14:57:15 rock NetworkManager[420]: <info> [1648234635.1325] dhcp6 (wlan0): state changed new lease, address=2600:1700:5f40:f3d0::544
Mar 25 15:26:37 rock NetworkManager[420]: <info> [1648236397.5000] dhcp4 (wlan0): canceled DHCP transaction
Mar 25 15:26:37 rock NetworkManager[420]: <info> [1648236397.5001] dhcp4 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Mar 25 15:26:37 rock NetworkManager[420]: <info> [1648236397.5001] dhcp4 (wlan0): state changed no lease
Mar 25 15:26:37 rock NetworkManager[420]: <info> [1648236397.5006] dhcp6 (wlan0): canceled DHCP transaction
Mar 25 15:26:37 rock NetworkManager[420]: <info> [1648236397.5006] dhcp6 (wlan0): activation: beginning transaction (timeout in 45 seconds)
Mar 25 15:26:37 rock NetworkManager[420]: <info> [1648236397.5006] dhcp6 (wlan0): state changed no lease
Even the current LTS will not solve this WiFi problem. I downgraded to a known good LTS 5.4.187-1-lts and everything works. ( Thank you @jonathon ). There are several reports of problems with the latest few kernel releases. I’ll just stay on this release for a while. No other WiFi devices are having problems, router is OK, Internet feed to home is OK.
You didn’t try to downgrade the kernel to 15.16.14?
No. I had been trying all sorts of “Internet advised fixes” all day and no luck. I was tired of fooling around so I went directly to 5.4 which I knew was long before the problem started. “I did not pass Go and did not collect $200.” 
Are you running it with
"options ath9k nohwcrypt=1"
I could give you a few bucks if you need some… 
No.
Just tried the “options ath9k nohwcrypt=1”. It didn’t help.
I just wondered. It has to be using the atk9k module.
https://wireless.wiki.kernel.org/en/users/drivers/ath9k
Check out the features on this page at the bottom. Example bluetooth coexist etc.
Looks like a fix may be on the way.
https://bugzilla.kernel.org/show_bug.cgi?id=215703
Looks like a fix may be on the way, so I’ll just be patient a little longer.