There is the unknown rate information error.
And it is VERY slow to negotiate a higher tx bitrate.
It always starts at 245.0 MBit/s then eventually gets to 1200.9 MBit/s.
$ lspci
00:14.3 Network controller: Intel Corporation Ice Lake-LP PCH CNVi WiFi
(rev 30)
$ iwlist wlp0s20f3 bitrate
wlp0s20f3 unknown bit-rate information.
Current Bit Rate:245 Mb/s
$ ifconfig
wlp0s20f3: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.68.73 netmask 255.255.252.0 broadcast 192.168.71.255
inet6 fe80::242d:b7ca:92cc:79d0 prefixlen 64 scopeid 0x20<link>
ether 84:1b:77:02:d9:6a txqueuelen 1000 (Ethernet)
RX packets 298984 bytes 281963663 (281.9 MB)
RX errors 0 dropped 58 overruns 0 frame 0
TX packets 55874 bytes 6700470 (6.7 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
$ uname -a
Linux james-aspirea51555 5.13.0-22-generic #22-Ubuntu SMP Fri Nov 5
13:21:36 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
$ iw dev wlp0s20f3 link
Connected to xxx (on wlp0s20f3)
SSID: xxx
freq: 5240
RX: 32287683 bytes (32648 packets)
TX: 586902 bytes (4676 packets)
signal: -39 dBm
rx bitrate: 1200.9 MBit/s 80MHz HE-MCS 11 HE-NSS 2 HE-GI 0 HE-DCM 0
tx bitrate: 245.0 MBit/s 80MHz HE-MCS 3 HE-NSS 2 HE-GI 2 HE-DCM 0
bss flags: short-slot-time
dtim period: 1
beacon int: 100
