Вот, посмотрел вывод dmesg после подключения в обоих случаях, отличается только двумя строчками, может пригодится?:
в установленной системе с P6 (где подключение работает):
[ 2821.356040] usb 5-2: new high speed USB device number 6 using ehci_hcd
[ 2821.490288] usb 5-2: New USB device found, idVendor=0bda, idProduct=8171
[ 2821.490294] usb 5-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 2821.490298] usb 5-2: Product: 11n USB Adapter
[ 2821.490301] usb 5-2: Manufacturer: Manufacturer Realtek
[ 2821.490304] usb 5-2: SerialNumber: 00e04c000001
[ 2821.491985] r8712u: DriverVersion: v7_0.20100831
[ 2821.492056] r8712u: register rtl8712_netdev_ops to netdev_ops
[ 2821.492062] r8712u: USB_SPEED_HIGH with 4 endpoints
[ 2821.492658] r8712u: Boot from EFUSE: Autoload OK
[ 2821.895852] r8712u: CustomerID = 0x0000
[ 2821.895860] r8712u: MAC Address from efuse = 00:14:d1:6b:bf:6a
[ 2822.091010] r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
[ 2822.748496] r8712u: 1 RCR=0x153f00e
[ 2822.749238] r8712u: 2 RCR=0x553f00e
в симпли 7 RC2 (не хочет подключаться):
[ 152.328025] usb 5-1: new high-speed USB device number 5 using ehci-pci
[ 152.462291] usb 5-1: New USB device found, idVendor=0bda, idProduct=8171
[ 152.462299] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 152.462303] usb 5-1: Product: 11n USB Adapter
[ 152.462306] usb 5-1: Manufacturer: Manufacturer Realtek
[ 152.462309] usb 5-1: SerialNumber: 00e04c000001
[ 152.466322] r8712u: Staging version
[ 152.466368] r8712u: register rtl8712_netdev_ops to netdev_ops
[ 152.466374] r8712u: USB_SPEED_HIGH with 4 endpoints
[ 152.466935] r8712u: Boot from EFUSE: Autoload OK
[ 152.842471] r8712u: CustomerID = 0x0000
[ 152.842479] r8712u: MAC Address from efuse = 00:14:d1:6b:bf:6a
[ 152.842482] r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
[ 152.948467] systemd-udevd[3403]: renamed network interface wlan0 to enp0s16f4u1
[ 153.760501] r8712u: 1 RCR=0x153f00e
[ 153.761250] r8712u: 2 RCR=0x553f00e
[ 153.868343] IPv6: ADDRCONF(NETDEV_UP): enp0s16f4u1: link is not ready
[ 154.180273] IPv6: ADDRCONF(NETDEV_UP): enp0s16f4u1: link is not ready