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이것저것 공부하다가 맞닥뜨리는 문제점, 해결방식 등 정리
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dell inspiron 15 5505 에서 5Ghz 에 대해 wifi 가 첫 부팅시 잘 연결되지 않는 현상 #78

Open eubnara opened 1 year ago

eubnara commented 1 year ago

https://superuser.com/questions/809282/wifi-5ghz-ap-mode-what-does-no-ir-means-and-can-i-bypass-it https://wireless.wiki.kernel.org/en/developers/Regulatory/CRDA#changing_regulatory_domains https://wireless.wiki.kernel.org/en/developers/Regulatory/CRDA#Using_iw_to_change_regulatory_domains

regulatory domain 미국으로 세팅되어 있어서?

❯ iw reg get
global
country US: DFS-FCC
    (902 - 904 @ 2), (N/A, 30), (N/A)
    (904 - 920 @ 16), (N/A, 30), (N/A)
    (920 - 928 @ 8), (N/A, 30), (N/A)
    (2400 - 2472 @ 40), (N/A, 30), (N/A)
    (5150 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
    (5250 - 5350 @ 80), (N/A, 24), (0 ms), DFS, AUTO-BW
    (5470 - 5730 @ 160), (N/A, 24), (0 ms), DFS
    (5730 - 5850 @ 80), (N/A, 30), (N/A), AUTO-BW
    (5850 - 5895 @ 40), (N/A, 27), (N/A), NO-OUTDOOR, AUTO-BW, PASSIVE-SCAN
    (5925 - 7125 @ 320), (N/A, 12), (N/A), NO-OUTDOOR, PASSIVE-SCAN
    (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), PASSIVE-SCAN
    (5460 - 5860 @ 80), (N/A, 30), (N/A), PASSIVE-SCAN
eubnara commented 1 year ago 
❯ iw reg set
Usage:  iw [options] reg set <ISO/IEC 3166-1 alpha2>

Notify the kernel about the current regulatory domain.

Options:
    --debug     enable netlink debugging

https://en.wikipedia.org/wiki/ISO_3166-1_alpha-2

❯ sudo iw reg set KR
❯ iw reg get
global
country 98: DFS-UNSET
    (2400 - 2472 @ 40), (N/A, 23), (N/A)
    (5150 - 5230 @ 80), (N/A, 23), (N/A), AUTO-BW
    (5230 - 5250 @ 20), (N/A, 17), (N/A), AUTO-BW
    (5250 - 5350 @ 100), (N/A, 20), (0 ms), DFS, AUTO-BW
    (5470 - 5725 @ 160), (N/A, 20), (0 ms), DFS
    (5725 - 5730 @ 5), (N/A, 23), (0 ms), DFS
    (5730 - 5850 @ 80), (N/A, 23), (N/A)
    (5925 - 7125 @ 160), (N/A, 12), (N/A), NO-OUTDOOR, PASSIVE-SCAN
    (57240 - 66000 @ 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), PASSIVE-SCAN
    (5460 - 5860 @ 80), (N/A, 30), (N/A), PASSIVE-SCAN
eubnara commented 1 year ago

재부팅하면 원상복구가 되어버린다. permanent 세팅 어떻게 할까.

eubnara commented 1 year ago

https://wireless.wiki.kernel.org/en/users/documentation/wpa_supplicant#setting_the_regulatory_domain https://unix.stackexchange.com/questions/453329/where-is-my-etc-wpa-supplicant-conf-on-systemd

  1. /etc/wpa_supplicant/wpa_supplicant.conf 파일 만들기 country=KR 내용 추가
  2. /lib/systemd/system/wpa_supplicant.service 내용을 /etc/systemd/system/wpa_supplicant.service 에 복사한 후 wap_supplicant 인자로 config 경로 추가하기 -c /etc/wpa_supplicant/wpa_supplicant.conf
[Unit]
Description=WPA supplicant
Before=network.target
After=dbus.service
Wants=network.target
IgnoreOnIsolate=true

[Service]
Type=dbus
BusName=fi.w1.wpa_supplicant1
ExecStart=/sbin/wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -u -s -O /run/wpa_supplicant
ExecReload=/bin/kill -HUP $MAINPID

[Install]
WantedBy=multi-user.target
Alias=dbus-fi.w1.wpa_supplicant1.service

위와 같이 하고 재부팅을 해봤지만, 동작하지 않았다. 로그에 다음 라인이 보인다. KR 로 세팅이 되지 않았다.

 9월 21 08:57:37 eub-inspiron5505 wpa_supplicant[942]: wlp2s0: CTRL-EVENT-REGDOM-CHANGE init=COUNTRY_IE type=COUNTRY alpha2=US
● wpa_supplicant.service - WPA supplicant
     Loaded: loaded (/etc/systemd/system/wpa_supplicant.service; enabled; vendor preset: enabled)
     Active: active (running) since Fri 2022-10-28 09:17:28 KST; 32s ago
   Main PID: 760 (wpa_supplicant)
      Tasks: 1 (limit: 18294)
     Memory: 6.5M
        CPU: 38ms
     CGroup: /system.slice/wpa_supplicant.service
             └─760 /sbin/wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf -u -s -O /run/wpa_supplicant
eubnara commented 1 year ago

crda 패키지를 사용하면 됐었겠는데, 22.04 부터는 설치할 수가 없다.

https://bugs.launchpad.net/netplan/+bug/1951586

From jammy onwards, the regulatory database is now baked into the kernel, and the crda package is gone

eubnara commented 1 year ago

https://medium.com/@renaudcerrato/how-to-build-your-own-wireless-router-from-scratch-part-3-d54eecce157f

❯ sudo dmesg | grep EEPROM
[    5.913268] ath: EEPROM regdomain: 0x6c
[    5.913270] ath: EEPROM indicates we should expect a direct regpair map
[   21.105000] ath: EEPROM regdomain: 0x8348
[   21.105001] ath: EEPROM indicates we should expect a country code
[   21.105002] ath: doing EEPROM country->regdmn map search
eubnara commented 1 year ago 
❯ sudo cat /etc/sudoers.d/eub
eub    ALL= NOPASSWD: /usr/sbin/iw
❯ cat ~/bin/change-regdom.sh 
#!/bin/bash
sleep 3
sudo iw reg set KR > /tmp/change-regdom.out 2>&1

타이밍 이슈로 인해 3초 정도 딜레이를 주었다. 이미 실행되고 wifi 가 enabled 되면 의미가 없어진다.

image

eubnara commented 1 year ago

나중에 crda 를 다시 쓸 수 있게 되거나 다른 대안이 나오면 그 방법을 써야할 것 같다. 그 전까지는 wifi enabled 후 iw reg set KR 을 직접 해주는 수밖에 없는 듯하다.

eubnara commented 1 year ago

netplan 에서 설정할 수 있도록 패치가 되었지만, networkd 를 쓸 경우에만 사용이 가능하다. https://bugs.launchpad.net/netplan/+bug/1951586

gui 의 경우 NetworkManager 를 사용하는데

❯ cat /etc/netplan/01-network-manager-all.yaml 
# Let NetworkManager manage all devices on this system
network:
  version: 2
  renderer: NetworkManager

NetworkManager 에 대해선 어떻게 설정을 해야할지 진행 중인 것으로 보인다. https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/960