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#1 2021-12-21 19:38:25

LyCC
Member
Registered: 2012-09-05
Posts: 166

0bda:c811 Realtek USB wifi unable to connect to any network

Hi everyone,

I have a
0bda:c811 Realtek Semiconductor Corp. 802.11ac NIC
usb wifi stick, on KDE it sees all the network, signal strength, etc, but I cannot connect to any network, it's stuck at "Configuring network interface"

the installed driver is the rtl8821cu-morrownr-dkms-git from AUR. Is this a driver issue or something else?
Thank you.

Dec 21 21:26:40 ArchPC NetworkManager[712]: <info>  [1640114800.4027] rfkill3: found Wi-Fi radio killswitch (at /sys/devices/pci0000:00/0000:00:01.3/0000:02:00.0/usb1/1-7/1-7:1.0/ieee80211/phy2/rfkill3) (driver rtl8821cu)
Dec 21 21:26:40 ArchPC systemd[1]: Started Load/Save RF Kill Switch Status.
Dec 21 21:26:40 ArchPC kernel: audit: type=1130 audit(1640114800.399:174): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 21 21:26:40 ArchPC kernel: rtl8821cu 1-7:1.0 wlp2s0f0u7: renamed from wlan0
Dec 21 21:26:40 ArchPC NetworkManager[712]: <info>  [1640114800.4497] device (wlan0): interface index 6 renamed iface from 'wlan0' to 'wlp2s0f0u7'
Dec 21 21:26:40 ArchPC NetworkManager[712]: <info>  [1640114800.4550] device (wlp2s0f0u7): state change: unmanaged -> unavailable (reason 'managed', sys-iface-state: 'external')
Dec 21 21:26:40 ArchPC mtp-probe[6266]: checking bus 1, device 6: "/sys/devices/pci0000:00/0000:00:01.3/0000:02:00.0/usb1/1-7"
Dec 21 21:26:40 ArchPC mtp-probe[6266]: bus: 1, device: 6 was not an MTP device
Dec 21 21:26:40 ArchPC systemd-udevd[6261]: Using default interface naming scheme 'v249'.
Dec 21 21:26:45 ArchPC systemd[1]: systemd-rfkill.service: Deactivated successfully.
Dec 21 21:26:45 ArchPC audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 21 21:26:45 ArchPC kernel: audit: type=1131 audit(1640114805.406:175): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-rfkill comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 21 21:26:52 ArchPC kernel: start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
Dec 21 21:26:53 ArchPC NetworkManager[712]: <info>  [1640114813.3315] device (wlp2s0f0u7): set-hw-addr: set MAC address to DE:D3:45:60:64:86 (scanning)
Dec 21 21:26:53 ArchPC wpa_supplicant[1025]: nl80211: kernel reports: Authentication algorithm number required
Dec 21 21:26:53 ArchPC NetworkManager[712]: <info>  [1640114813.4002] device (wlp2s0f0u7): supplicant interface state: internal-starting -> disconnected

Last edited by LyCC (2021-12-22 11:44:01)

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#2 2021-12-21 20:56:03

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

https://bbs.archlinux.org/viewtopic.php … 7#p2005477

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#3 2021-12-22 03:25:34

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

Thank you, unfortunately it's not working (disabled networkmanager, rebooted)

WPA association/authentication failed for interface 'wlp2s0f0u7'

since the wifi password entered is correctly, can I assume that this is a driver (or maybe a hardware) issue or may be something else?
Edit: hw issue with the usb wifi ruled out, just tried it in another os that shall not be named and it's working perfectly fine.

Dec 22 04:30:02 ArchPC systemd[1]: Starting Networking for netctl profile MicroTick...
Dec 22 04:30:02 ArchPC network[3126]: Starting network profile 'MicroTick'...
Dec 22 04:30:02 ArchPC network[3135]: nl80211: kernel reports: Authentication algorithm number required
Dec 22 04:30:02 ArchPC kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0f0u7: link becomes ready
Dec 22 04:30:02 ArchPC systemd[1]: Started Networking for netctl profile MicroTick.
Dec 22 04:30:02 ArchPC audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@MicroTick comm="system>
Dec 22 04:30:02 ArchPC kernel: audit: type=1130 audit(1640140202.949:105): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=n>
Dec 22 04:30:04 ArchPC avahi-daemon[712]: Joining mDNS multicast group on interface wlp2s0f0u7.IPv6 with address fe80::1ebf:ceff:>
Dec 22 04:30:04 ArchPC avahi-daemon[712]: New relevant interface wlp2s0f0u7.IPv6 for mDNS.
Dec 22 04:30:04 ArchPC avahi-daemon[712]: Registering new address record for fe80::1ebf:ceff:fee3:aa50 on wlp2s0f0u7.*.
Dec 22 04:30:15 ArchPC kernel: start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
Dec 22 04:30:30 ArchPC network[3126]: WPA association/authentication failed for interface 'wlp2s0f0u7'
Dec 22 04:30:31 ArchPC avahi-daemon[712]: Interface wlp2s0f0u7.IPv6 no longer relevant for mDNS.
Dec 22 04:30:31 ArchPC avahi-daemon[712]: Leaving mDNS multicast group on interface wlp2s0f0u7.IPv6 with address fe80::1ebf:ceff:>
Dec 22 04:30:31 ArchPC avahi-daemon[712]: Withdrawing address record for fe80::1ebf:ceff:fee3:aa50 on wlp2s0f0u7.
Dec 22 04:30:31 ArchPC network[3126]: Failed to bring the network up for profile 'MicroTick'
Dec 22 04:30:31 ArchPC audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@MicroTick comm="systemd>
Dec 22 04:30:31 ArchPC systemd[1]: netctl@MicroTick.service: Main process exited, code=exited, status=1/FAILURE
Dec 22 04:30:31 ArchPC systemd[1]: netctl@MicroTick.service: Failed with result 'exit-code'.

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#4 2021-12-22 08:30:15

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

Is the OtherOSthatShallNotBeNamed™ a parallel windows installation?
=> 3rd link below.

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#5 2021-12-22 12:47:24

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

Unfortunately it's never that simple... it was a different machine where I have tried the adapter.

Last edited by LyCC (2021-12-22 12:50:22)

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#6 2021-12-24 08:06:02

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

I had a bit of time to play around, a new kernel update after, but still doesn't work. Tried the projector with the simple 12345678 password (the profile was set up with wifi-menu, scan, etc is working), the same issue there ... overall, I guess it is not a NetworkManager fault, but something else...

Dec 24 09:59:50 ArchPC network[80841]: Starting network profile 'PROJECTOR'...
Dec 24 09:59:50 ArchPC network[80850]: nl80211: kernel reports: Authentication algorithm number required
Dec 24 09:59:50 ArchPC kernel: IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0f0u8: link becomes ready
Dec 24 09:59:51 ArchPC systemd[1]: Started Networking for netctl profile PROJECTOR.
Dec 24 09:59:51 ArchPC audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@PROJECTOR comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 24 09:59:51 ArchPC kernel: audit: type=1130 audit(1640332791.047:268): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@PROJECTOR comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 24 09:59:52 ArchPC avahi-daemon[712]: Joining mDNS multicast group on interface wlp2s0f0u8.IPv6 with address fe80::1ebf:ceff:fee3:aa50.
Dec 24 09:59:52 ArchPC avahi-daemon[712]: New relevant interface wlp2s0f0u8.IPv6 for mDNS.
Dec 24 09:59:52 ArchPC avahi-daemon[712]: Registering new address record for fe80::1ebf:ceff:fee3:aa50 on wlp2s0f0u8.*.
Dec 24 10:00:03 ArchPC kernel: start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
Dec 24 10:00:19 ArchPC network[80841]: WPA association/authentication failed for interface 'wlp2s0f0u8'
Dec 24 10:00:20 ArchPC avahi-daemon[712]: Interface wlp2s0f0u8.IPv6 no longer relevant for mDNS.
Dec 24 10:00:20 ArchPC avahi-daemon[712]: Leaving mDNS multicast group on interface wlp2s0f0u8.IPv6 with address fe80::1ebf:ceff:fee3:aa50.
Dec 24 10:00:20 ArchPC avahi-daemon[712]: Withdrawing address record for fe80::1ebf:ceff:fee3:aa50 on wlp2s0f0u8.
Dec 24 10:00:20 ArchPC network[80841]: Failed to bring the network up for profile 'PROJECTOR'
Dec 24 10:00:20 ArchPC systemd[1]: netctl@PROJECTOR.service: Main process exited, code=exited, status=1/FAILURE
Dec 24 10:00:20 ArchPC systemd[1]: netctl@PROJECTOR.service: Failed with result 'exit-code'.
Dec 24 10:00:20 ArchPC audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@PROJECTOR comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'

Btw, I also get this error when starting the network scan.

Scanning for networks... nl80211: kernel reports: Authentication algorithm number required

The profile generated by wifi-menu is:

Description='Automatically generated profile by wifi-menu'
Interface=wlp2s0f0u8
Connection=wireless
Security=wpa
ESSID=PROJECTOR-181E
IP=dhcp
Key=\"c024d8e6c2f056a6d3d204d598d522ea8be2066e4a7ad9d25abd1902ea39d59a

Overall, is this most likely a driver issue? If so, I will try to report it upstream (I am using the rtl8821cu-morrownr-dkms-git package).
Thank you.

Last edited by LyCC (2021-12-24 08:07:07)

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#7 2021-12-24 10:08:35

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

Do you get more error details in the netctl status?
If not, what if you try to associate manually? https://wiki.archlinux.org/title/Wpa_supplicant
You could also try to use iwd isntead, https://wiki.archlinux.org/title/Iwd

In any event, please post the scan results - this might be some weirdness in th AP configuration.

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#8 2021-12-24 11:30:18

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

No additional events in the log (netctl status displays only the same error)

wpa doesn't work

Selected interface 'wlp2s0f0u8'

Interactive mode

> scan
OK
> scan_'PING' command timed out.
Connection to wpa_supplicant lost - trying to reconnect
Connection to wpa_supplicant re-established
> scan_results
bssid / frequency / signal level / flags / ssid
<3>CTRL-EVENT-SCAN-RESULTS 
<3>CTRL-EVENT-NETWORK-NOT-FOUND 
> scan_results
bssid / frequency / signal level / flags / ssid
00:bf:af:ab:f0:6b       2437    -49     [WPA2-PSK-CCMP][ESS]    PROJECTOR-181E
c4:47:3f:34:07:b4       2462    -82     [WPA-PSK-CCMP+TKIP][WPA2-PSK-CCMP+TKIP][ESS]    MicroTick
> add_network
0
> set_network 0 ssid "PROJECTOR-181E"
OK
> set_network 0 psk "12345678"
OK
> enable_network 0
OK
> 'PING' command timed out.
Connection to wpa_supplicant lost - trying to reconnect
Connection to wpa_supplicant re-established
<3>CTRL-EVENT-SCAN-RESULTS 
<3>Trying to associate with 00:bf:af:ab:f0:6b (SSID='PROJECTOR-181E' freq=2437 MHz)
<3>CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=2437 ht_enabled=1 ch_offset=0 ch_width=20 MHz cf1=2437 cf2=0
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
<3>CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
<3>CTRL-EVENT-SCAN-STARTED 
<3>CTRL-EVENT-SCAN-RESULTS 
<3>Trying to associate with 00:bf:af:ab:f0:6b (SSID='PROJECTOR-181E' freq=2437 MHz)
... and the last block repeating without any success ...

before the "Ping timeout" message the terminal hangs for about 2-3 seconds.
and the deamon output

nl80211: kernel reports: Authentication algorithm number required
wlp2s0f0u8: CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=2437 ht_enabled=1 ch_offset=0 ch_width=20 MHz cf1=2437 cf2=0
wlp2s0f0u8: CTRL-EVENT-ASSOC-REJECT status_code=1
wlp2s0f0u8: CTRL-EVENT-ASSOC-REJECT status_code=1
wlp2s0f0u8: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
wlp2s0f0u8: Trying to associate with 00:bf:af:ab:f0:6b (SSID='PROJECTOR-181E' freq=2437 MHz)
nl80211: kernel reports: Authentication algorithm number required
wlp2s0f0u8: CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=2437 ht_enabled=1 ch_offset=0 ch_width=20 MHz cf1=2437 cf2=0
wlp2s0f0u8: CTRL-EVENT-ASSOC-REJECT status_code=1
wlp2s0f0u8: CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="PROJECTOR-181E" auth_failures=1 duration=10 reason=CONN_FAILED
wlp2s0f0u8: CTRL-EVENT-ASSOC-REJECT status_code=1
wlp2s0f0u8: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
wlp2s0f0u8: CTRL-EVENT-SSID-REENABLED id=0 ssid="PROJECTOR-181E"
... and the same block repeating ...

I will try lwd later on, thanks for now.

Edit: sadly iwd doesn't not work, the "get-networks" start writing empty spaces to the terminal at maximum cpu speed (rebooted several times, disabled netctl, etc...).

Last edited by LyCC (2021-12-24 12:10:31)

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#9 2021-12-24 14:25:31

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

If you monitor "ip a", can you bring the NIC up at all?

ip link set wlp2s0f0u8 up

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#10 2021-12-24 17:00:43

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

yes

ip link set wlp2s0f0u8 up
ip a

5: wlp2s0f0u8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 1c:bf:ce:e3:aa:50 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::1ebf:ceff:fee3:aa50/64 scope link 
       valid_lft forever preferred_lft forever

Last edited by LyCC (2021-12-24 17:01:29)

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#11 2021-12-24 18:57:25

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

'key.
So you get rejected w/o a return code.
How many are "any network"? Is it possible that you configured a MAC filter on the AP?

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#12 2021-12-24 19:46:09

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

seth wrote:

'key.
So you get rejected w/o a return code.
How many are "any network"? Is it possible that you configured a MAC filter on the AP?

I don't think I was ever that drunk smile I have two networks + the projector creates it's own + I have an old spare wifi router, which I haven't tried yet, but I just had an idea, I will set that up as an open network and test it.

Other idea: I have set my main network to open, it does not work. I am still getting " WPA association/authentication failed for interface 'wlp2s0f0u8'" but "Security=none" in the config file (I have erased and recreated the file with wifi-menu, does it
take the config file from somewhere other then /etc/netctl ?).

cat ./wlp2s0f0u8-MicroTick
Description='Automatically generated profile by wifi-menu'
Interface=wlp2s0f0u8
Connection=wireless
Security=none
ESSID=MicroTick
IP=dhcp
Dec 24 21:59:28 ArchPC systemd[1]: Starting Networking for netctl profile wlp2s0f0u8-MicroTick...
Dec 24 21:59:28 ArchPC network[2735]: Starting network profile 'wlp2s0f0u8-MicroTick'...
Dec 24 21:59:28 ArchPC network[2743]: nl80211: kernel reports: Authentication algorithm number required
Dec 24 21:59:28 ArchPC systemd[1]: Started Networking for netctl profile wlp2s0f0u8-MicroTick.
Dec 24 21:59:28 ArchPC audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@wlp2s0f0u8\x2dMicroTick comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 24 21:59:28 ArchPC kernel: audit: type=1130 audit(1640375968.681:114): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=netctl@wlp2s0f0u8\x2dMicroTick comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Dec 24 21:59:30 ArchPC avahi-daemon[708]: Joining mDNS multicast group on interface wlp2s0f0u8.IPv6 with address fe80::1ebf:ceff:fee3:aa50.
Dec 24 21:59:30 ArchPC avahi-daemon[708]: New relevant interface wlp2s0f0u8.IPv6 for mDNS.
Dec 24 21:59:30 ArchPC avahi-daemon[708]: Registering new address record for fe80::1ebf:ceff:fee3:aa50 on wlp2s0f0u8.*.
Dec 24 21:59:40 ArchPC kernel: start_addr=(0x8000), end_addr=(0x10000), buffer_size=(0x8000), smp_number_max=(4096)
Dec 24 21:59:56 ArchPC network[2735]: WPA association/authentication failed for interface 'wlp2s0f0u8'
Dec 24 21:59:57 ArchPC avahi-daemon[708]: Interface wlp2s0f0u8.IPv6 no longer relevant for mDNS.
Dec 24 21:59:57 ArchPC avahi-daemon[708]: Leaving mDNS multicast group on interface wlp2s0f0u8.IPv6 with address fe80::1ebf:ceff:fee3:aa50.
Dec 24 21:59:57 ArchPC avahi-daemon[708]: Withdrawing address record for fe80::1ebf:ceff:fee3:aa50 on wlp2s0f0u8.
Dec 24 21:59:57 ArchPC network[2735]: Failed to bring the network up for profile 'wlp2s0f0u8-MicroTick'
Dec 24 21:59:57 ArchPC systemd[1]: netctl@wlp2s0f0u8\x2dMicroTick.service: Main process exited, code=exited, status=1/FAILURE
Dec 24 21:59:57 ArchPC systemd[1]: netctl@wlp2s0f0u8\x2dMicroTick.service: Failed with result 'exit-code'.

Anyway, at this point I believe have taken up enough of your time Seth, thank you very much for your help.

Last edited by LyCC (2021-12-24 20:13:16)

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#13 2021-12-24 21:38:30

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

There's no wpa_supplicant call in the journal, so this might be a clumsy status token.
You can test https://wiki.archlinux.org/title/Networ … cess_point

Other than that you could try whether "wpa_supplicant -dd" produces more relevant information and a completely different cause might be https://wiki.archlinux.org/title/Power_ … utosuspend

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#14 2021-12-25 02:03:11

LyCC
Member
Registered: 2012-09-05
Posts: 166

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

Hah! I managed to connect to open network with the iw command (wonder why netctl isn't working)

ip link show wlp2s0f0u8
5: wlp2s0f0u8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
    link/ether 1c:bf:ce:e3:aa:50 brd ff:ff:ff:ff:ff:ff
[root@ArchPC etc]# iw dev wlp2s0f0u8 scan
scan aborted!
[root@ArchPC etc]# iw dev wlp2s0f0u8 scan
scan aborted!
[root@ArchPC etc]# iw dev wlp2s0f0u8 connect MicroTick
[root@ArchPC etc]# iw dev wlp2s0f0u8 link
Connected to c4:47:3f:34:07:b4 (on wlp2s0f0u8)
        SSID: MicroTick
        freq: 2462
        signal: -75 dBm
        tx bitrate: 150.0 MBit/s
[root@ArchPC etc]# dhclient wlp2s0f0u8
[root@ArchPC etc]# ip a
5: wlp2s0f0u8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 1c:bf:ce:e3:aa:50 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.69/24 brd 192.168.1.255 scope global wlp2s0f0u8
       valid_lft forever preferred_lft forever

Strangely the scan does not work, although the led blinks on the device, but instantly gives an aborted.

So back to password. The router it come set up as Auth mode: "WPA/WPA2 PresharedKey", Encryption Mode: "TKIP/AES". However I don't think this might be a problem since some cheap 0.60 with shipping chinese wifi adapters are working out of the box.

Here is the -dd log with password: https://pastebin.com/Km6FCcfn
The wpa_cli steps ware the same as posted above (scan, connect)

Interactive mode

Could not connect to wpa_supplicant: (nil) - re-trying
Selected interface 'wlp2s0f0u8'
Connection established.
<3>CTRL-EVENT-TERMINATING 
Connection to wpa_supplicant lost - trying to reconnect
Connection to wpa_supplicant re-established
> scan
OK
<3>CTRL-EVENT-SCAN-STARTED 
> scan_results
bssid / frequency / signal level / flags / ssid
> scan_results
bssid / frequency / signal level / flags / ssid
<3>CTRL-EVENT-SCAN-RESULTS 
<3>CTRL-EVENT-NETWORK-NOT-FOUND 
> add_network
0
> set_network 0 ssid "MicroTick"
OK
> set_network 0 psk "**removed**"
OK
> enable_network 0
OK
<3>CTRL-EVENT-SCAN-STARTED 
<3>CTRL-EVENT-SCAN-RESULTS 
<3>Trying to associate with c4:47:3f:34:07:b4 (SSID='MicroTick' freq=2462 MHz)
<3>CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=2462 ht_enabled=1 ch_offset=-1 ch_width=40 MHz cf1=2452 cf2=0
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
<3>CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
<3>CTRL-EVENT-SCAN-STARTED 
<3>CTRL-EVENT-SCAN-RESULTS 
<3>Trying to associate with c4:47:3f:34:07:b4 (SSID='MicroTick' freq=2462 MHz)
<3>CTRL-EVENT-STARTED-CHANNEL-SWITCH freq=2462 ht_enabled=1 ch_offset=-1 ch_width=40 MHz cf1=2452 cf2=0
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
<3>CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD
<3>CTRL-EVENT-SCAN-STARTED 
<3>CTRL-EVENT-SCAN-RESULTS 
<3>Trying to associate with c4:47:3f:34:07:b4 (SSID='MicroTick' freq=2462 MHz)
<3>CTRL-EVENT-ASSOC-REJECT status_code=1
> 'PING' command timed out.
Connection to wpa_supplicant lost - trying to reconnect
Connection to wpa_supplicant re-established
<3>CTRL-EVENT-SCAN-RESULTS 
<3>Trying to associate with c4:47:3f:34:07:b4 (SSID='MicroTick' freq=2462 MHz)

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#15 2021-12-25 08:39:03

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

signal: -75 dBm

Can you get closer to the AP and try again?

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#16 2025-01-18 14:21:49

Satscape
Member
Registered: 2025-01-18
Posts: 1

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

Had this issue today, fixed it with:
sudo rm /etc/modprobe.d/8821cu.conf    (remove conflicting file)
yay 8821cu   (install option 1)
sudo modprobe 8821cu    (load driver)

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#17 2025-01-18 14:55:14

seth
Member
Registered: 2012-09-03
Posts: 60,807

Re: 0bda:c811 Realtek USB wifi unable to connect to any network

This thread is > 3 years old…
There's no 8821cu package, https://aur.archlinux.org/packages?K=8821cu
rtw88_8821cu is meanwhile(?) in the kernel but you probably installed https://aur.archlinux.org/packages/rtl8821cu-dkms-git ?

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