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I was getting good Wifi speeds before 1 month, but recently I noticed my wifi speed doesn't go above 54mbps in ubuntu 22.04, whereas it works perfectly in Windows 11 , I use TP link Wifi 6 router AX70 and as well as TP link wifi AC 1200.

My wifi hardware: iwconfig output (few info masked)

      wlp0s20f3  IEEE 802.11  ESSID:"XXXX3"

  Mode:Managed  Frequency:5.745 GHz  Access Point: XX:XX:XX:XX:XX:XX   
  **Bit Rate=54 Mb/s**   Tx-Power=20 dBm   
  Retry short limit:7   RTS thr:off   Fragment thr:off
  Encryption key:off
  Power Management:off
  Link Quality=45/70  Signal level=-65 dBm  
  Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
  Tx excessive retries:0  Invalid misc:358   Missed beacon:0

lspci -knn | grep Net -A3 output:

0000:00:14.3 Network controller [0280]: Intel Corporation Alder Lake-P PCH CNVi WiFi [8086:51f0] (rev 01)

Subsystem: Intel Corporation Device [8086:0094]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi

I tried the solution provided here 22.04 unstable wifi Intel Corporation Alder Lake-P PCH CNVi WiFi [8086:51f0] (rev 01) kernel 5.19 , But didn't work. I have the exact same wifi hardware, and tried with kernel 5.15.0-60,5.19.0-38 & even 6.1.0-1008, but no luck!.

Below solution doesn't work for disable n network in /etc/modprobe.d/iwlwifi.conf

options iwlwifi 11n_disable=1 swcrypto=1

Please let me know how I can I resolve this, or any other driver that I can install?.

root
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1 Answers1

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The driver parameter that you added has exactly the effect you are seeing: slow speeds. I suggest that you remove this line entirely from iwlwifi.conf:

options iwlwifi 11n_disable=1 swcrypto=1

Next, unload and reload the driver:

sudo modprobe -r iwlwifi && sudo modprobe iwlwifi

There are also some steps you can take with your router to help stability. First, use fixed channels, like 11 and 149, rather than auto-channel select. Second, Use WPA2/WPA3 only, not any mixed mode and certainly not TKIP. Third, rename the 2.4 gHz and 5 gHz segments of your router; something like myrouter2.4 and myrouter5. Direct your computer to use the 5 gHz segment only.

After making these changes, reboot the router.

chili555
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  • Thanks for the fix, but I don't understand, I enabled this becoz of wifi slowness, but now I disable it and now its working!!, strange. – root Mar 20 '23 at 15:31
  • You got bad advice. That might help stability but not slowness. – chili555 Mar 20 '23 at 15:37