I solved the issue. I previously installed the base-devel package.
$this->bbcode_second_pass_code('', '
[alarm@alarmpi rtl8723bu]$ sudo pacman -S base-devel
')
To solve it I upgraded linux and linux headers with the following commands:
$this->bbcode_second_pass_code('', '
pacman -Syy
pacman -S linux
reboot
pacman -S linux-headers
')
Now I see the usb dongle successfully:
$this->bbcode_second_pass_code('', '
[alarm@alarmpi ~]$ ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether b8:27:eb:8e:c9:ef brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether 74:da:38:c7:83:f4 brd ff:ff:ff:ff:ff:ff
4: wlan1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
link/ether 76:da:38:c7:83:f4 brd ff:ff:ff:ff:ff:ff
')
Two wlan adapters are found after the reboot.
https://edimax.freshdesk.com/support/so ... spberry-pi