Tiny Core Linux

Tiny Core Base => Raspberry Pi => Topic started by: ovacikar on December 22, 2024, 10:16:13 AM

Title: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: ovacikar on December 22, 2024, 10:16:13 AM
Are these settings in picore 15 normal? Trying to find out why rtl8192cu is giving me so many problems and noticed this:

Code: [Select]
tc@:~$ iw reg get
tc@:~$ global
country US: DFS-FCC
(2400 - 2483 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)

phy#0
country 99: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 40), (N/A, 20), (N/A), PASSIVE-SCAN
(5140 - 5360 @ 80), (N/A, 30), (N/A)
(5460 - 5860 @ 80), (N/A, 30), (N/A)


iwlist channel
lo        no frequency information.

eth0      no frequency information.

wlan0     13 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
          Channel 12 : 2.467 GHz
          Channel 13 : 2.472 GHz


In comparison, legacy 8192cu ( without the rtl prefix. rtl8192cu and 8192cu are different) driver in picore 12.x shows proper channel and regdb, and works perfectly everywhere:

Code: [Select]
tc@:~$ iw reg get
global
country US: DFS-FCC
(2400 - 2483 @ 40), (N/A, 30), (N/A)
(5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5350 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5470 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5730 - 5850 @ 80), (N/A, 30), (N/A)
(57240 - 71000 @ 2160), (N/A, 40), (N/A)

tc@pi:~$ iwlist channel
wlan0     11 channels in total; available frequencies :
          Channel 01 : 2.412 GHz
          Channel 02 : 2.417 GHz
          Channel 03 : 2.422 GHz
          Channel 04 : 2.427 GHz
          Channel 05 : 2.432 GHz
          Channel 06 : 2.437 GHz
          Channel 07 : 2.442 GHz
          Channel 08 : 2.447 GHz
          Channel 09 : 2.452 GHz
          Channel 10 : 2.457 GHz
          Channel 11 : 2.462 GHz
Title: Re: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: Paul_123 on December 22, 2024, 12:13:47 PM
Drivers are required to be regulatory compliant.  Are you setting country code in your wpa_supplicant?

Channels 12 and 13 are in the US are typically not regulatory compliant. (Very special circumstances allow it, but I've never seen them enabled in the US reg dom)
Title: Re: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: ovacikar on December 22, 2024, 12:52:41 PM
No , I am using wifi.sh script, but these settings are loaded before running the script.The wpa_supplicant.conf only contains the WPA password, after running the script.

I was wondering if the poor performance of rtl8192cu is caused by the restricted TX power for all channels mentioned for this additional phy0 entry. My rhome outer does not advertise channels 12/13 anyways.


The AP selects channel 2 in auto mode. Using the same channel 2 , local download 2x faster with the legacy 8192cu


Title: Re: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: Paul_123 on December 22, 2024, 01:08:52 PM
The wifi script is very generic it doesn’t support country code, which is becoming more and more restrictive.  Best to manually configure it, so you know exactly what’s going on.
Title: Re: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: ovacikar on December 22, 2024, 02:53:10 PM
Public Wifi hotspots do not use WPA  / wpa_supplicant at all, so I will try this next time near a public wifi:

Code: [Select]
sudo iw reg set US 
Title: Re: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: Paul_123 on December 22, 2024, 03:34:57 PM
wpa_supplicant may override that,  while the program is called wpa_supplicant, you can configure open networks just fine.
Title: Re: Wifi 2.4 GHz channels and regdb in picore 15.x
Post by: ovacikar on February 14, 2025, 02:15:41 PM
I have found the country can be set by the cfg80211 module parameter

Code: [Select]
cat /etc/modprobe.d/cfg80211.conf
options cfg80211 ieee80211_regdom=US