//Solution:

I installed this driver (https://github.com/morrownr/8821au-20210708).

The driver however, did not work until I ran a script called remove-driver.sh from the driver that I used to use (https://github.com/morrownr/8821cu-20210916). Then the wifi adapter started working again :)

Thanks a lot for the help - I am still not really sure what the problem actually was, but I’m very thankful for having my internet connection back :)

//Original post below:

Hey :)

I’ve been using a wifi adapter for my computer for about a year. A few days ago, it suddenly stopped working. It no longer shows up when I run ‘nmcli device’ in the terminal. When running ‘lsusb’ it still shows up as ‘Realtek Semiconductor Corp. 802.11ac NIC’.

To my knowledge I hadn’t updated anything before it stopped working. After it had stopped working, I used usb-tethering from my phone to do a system update, hoping it would fix the problem. I think one of the updates was a linux firmware update. Anyways, it didn’t fix anything.

The adapter didn’t work out of the box. It arrived with a driver called ‘RTL88x2BU’ and a document stating that it was compatible with the following chip drivers for linux: RTL8811AU RTL8811CU RTL8812BU RTL8814AU

I couldn’t get the driver it arrived with to work, so instead I downloaded this driver and have been using it until it stopped working. https://github.com/morrownr/8821cu-20210916

this driver only states that it supports some linux kernel version. I’m using ‘6.8.0-40-generic’, which it does not claim to suppport. I download this driver, which should support my kernel, but it didn̈́’t work either. https://github.com/morrownr/8821au-20210708

I’ve tried running lsmod on my system, and it seems to be, that no wifi driver even starts. The only thing I can remember doing just prior to my internet not working, was running ‘systemctl disable jellyfin.service’. I doubt that has anything to do with this, but I’m not sure what else it could be. My only other theory is, maybe the usb wifi adapter hardware just gave up.

Any help is appreciated ^^

  • Successful_Try543
    2·
    4 months ago

    If it’s an usb device, you can remove it and plug it in again and look at the ‘new’ lines at the end of the dmesg output.

    • RAM@discuss.tchncs.deOP
      41·
      4 months ago

      Thanks :))

      I get, all in green text

      [  653.571686] usb 2-1.5: USB disconnect, device number 4
[  655.312262] usb 2-1.5: new high-speed USB device number 5 using ehci-pci
[  655.391050] usb 2-1.5: New USB device found, idVendor=0bda, idProduct=1a2b, bcdDevice= 2.00
[  655.391061] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  655.391064] usb 2-1.5: Product: DISK
[  655.391067] usb 2-1.5: Manufacturer: Realtek
[  655.392897] usb-storage 2-1.5:1.0: USB Mass Storage device detected
[  655.393284] scsi host0: usb-storage 2-1.5:1.0
[  656.219917] usb 2-1.5: USB disconnect, device number 5
[  656.392263] usb 2-1.5: new high-speed USB device number 6 using ehci-pci
[  656.471130] usb 2-1.5: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  656.471139] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  656.471143] usb 2-1.5: Product: 802.11ac NIC
[  656.471146] usb 2-1.5: Manufacturer: Realtek
[  656.471149] usb 2-1.5: SerialNumber: 123456
[  778.302397] kauditd_printk_skb: 72 callbacks suppressed
[  778.302402] audit: type=1400 audit(1724013264.553:83): apparmor="DENIED" operation="capable" class="cap" profile="/usr/lib/snapd/snap-confine" pid=2429 comm="snap-confine" capability=12  capname="net_admin"
[  778.397393] audit: type=1400 audit(1724013264.648:84): apparmor="DENIED" operation="open" class="file" profile="snap-update-ns.firefox" name="/usr/local/share/" pid=2460 comm="5" requested_mask="r" denied_mask="r" fsuid=0 ouid=0
[  780.466450] audit: type=1107 audit(1724013266.717:85): pid=768 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/org/freedesktop/timedate1" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.126" pid=2429 label="snap.firefox.firefox" peer_pid=2581 peer_label="unconfined"
                exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
[  780.468502] audit: type=1107 audit(1724013266.719:86): pid=768 uid=102 auid=4294967295 ses=4294967295 subj=unconfined msg='apparmor="DENIED" operation="dbus_method_call"  bus="system" path="/org/freedesktop/timedate1" interface="org.freedesktop.DBus.Properties" member="GetAll" mask="send" name=":1.126" pid=2429 label="snap.firefox.firefox" peer_pid=2581 peer_label="unconfined"
                exe="/usr/bin/dbus-daemon" sauid=102 hostname=? addr=? terminal=?'
[  809.734261] usb 2-1.6: new high-speed USB device number 7 using ehci-pci
[  809.818389] usb 2-1.6: New USB device found, idVendor=0fce, idProduct=020c, bcdDevice= 4.14
[  809.818400] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  809.818404] usb 2-1.6: Product: XQ-AU52
[  809.818407] usb 2-1.6: Manufacturer: Sony
[  809.818409] usb 2-1.6: SerialNumber: QV7112J13A
[  815.706827] usb 2-1.6: USB disconnect, device number 7
[  815.878262] usb 2-1.6: new high-speed USB device number 8 using ehci-pci
[  815.959096] usb 2-1.6: New USB device found, idVendor=0fce, idProduct=720c, bcdDevice= 4.14
[  815.959106] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  815.959110] usb 2-1.6: Product: XQ-AU52
[  815.959113] usb 2-1.6: Manufacturer: Sony
[  815.959115] usb 2-1.6: SerialNumber: QV7112J13A
[  815.983152] usbcore: registered new interface driver cdc_ether
[  815.988878] rndis_host 2-1.6:1.0 usb0: register 'rndis_host' at usb-0000:00:1d.0-1.6, RNDIS device, 32:5a:e8:f2:1d:46
[  815.988916] usbcore: registered new interface driver rndis_host
[  815.999781] rndis_host 2-1.6:1.0 enx325ae8f21d46: renamed from usb0
[  845.914645] usb 2-1.5: USB disconnect, device number 6
[  847.366261] usb 2-1.5: new high-speed USB device number 9 using ehci-pci
[  847.445009] usb 2-1.5: New USB device found, idVendor=0bda, idProduct=1a2b, bcdDevice= 2.00
[  847.445019] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  847.445023] usb 2-1.5: Product: DISK
[  847.445026] usb 2-1.5: Manufacturer: Realtek
[  847.446985] usb-storage 2-1.5:1.0: USB Mass Storage device detected
[  847.447905] scsi host0: usb-storage 2-1.5:1.0
[  848.218628] usb 2-1.5: USB disconnect, device number 9
[  848.392263] usb 2-1.5: new high-speed USB device number 10 using ehci-pci
[  848.471090] usb 2-1.5: New USB device found, idVendor=0bda, idProduct=c811, bcdDevice= 2.00
[  848.471100] usb 2-1.5: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  848.471104] usb 2-1.5: Product: 802.11ac NIC
[  848.471107] usb 2-1.5: Manufacturer: Realtek
[  848.471110] usb 2-1.5: SerialNumber: 123456
      • Successful_Try543
        1·
        4 months ago

        So, dmesg doesn’t show any errors. Thus the device seems not to be physically damaged. But I also don’t see that any driver is loaded.