Bonjour xubu, voici les retours :
~$ lspci -nnk | grep 0280 -A3
00:14.3 Network controller [0280]: Intel Corporation Wireless-AC 9560 [Jefferson Peak] [8086:a370] (rev 10)
Subsystem: Intel Corporation Device [8086:02a4]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
~$ lsmod | grep cfg80211
cfg80211 634880 3 iwlmvm,iwlwifi,mac80211
~$ rfkill list all
0: hci0: Bluetooth
Soft blocked: yes
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
~$ iwconfig
enp2s0 no wireless extensions.
wlo1 IEEE 802.11 ESSID:"TP-Link_0687"
Mode:Managed Frequency:2.417 GHz Access Point: 1C:3B:F3:F1:06:87
Bit Rate=135 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=47/70 Signal level=-63 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:654 Missed beacon:0
lo no wireless extensions.
~$ nmcli dev wifi
IN-USE SSID MODE CHAN RATE SIGNAL BARS SECURITY
* TP-Link_0687 Infra 2 270 Mbit/s 57 ▂▄▆_ WPA2
A noter qu'au boot d'Ubuntu, dans les premières minutes d'utilisation le débit est parfois acceptable (40Mbps), puis retombe rapidement (actuellement 0.11Mbps en descendant....)