Comment 0 for bug 1906987

Hi,
I've recently bought a wi-fi card based on Intel AX200 chipset and it is extremly slow if compared with same network performances on the same ssid (and at the same distance from router).

These are the details of my network
sudo lshw -C network; lsb_release -a; uname -a
  *-network
       description: Wireless interface
       product: Wi-Fi 6 AX200
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:04:00.0
       logical name: wlp4s0
       version: 1a
       serial: 8c:c6:81:19:40:65
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.8.0-31-generic firmware=55.d9698065.0 cc-a0-55.ucode ip=192.168.100.8 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:16 memory:febfc000-febfffff
  *-network
       description: Ethernet interface
       product: AR8121/AR8113/AR8114 Gigabit or Fast Ethernet
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: enp2s0
       version: b0
       serial: 00:24:8c:37:c6:3c
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=ATL1E driverversion=5.8.0-31-generic firmware=L1e latency=0 link=no multicast=yes port=twisted pair
       resources: irq:17 memory:fe9c0000-fe9fffff ioport:dc00(size=128)
  *-network:0
       description: Ethernet interface
       physical id: 1
       logical name: virbr0
       serial: 52:54:00:50:fd:ef
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=bridge driverversion=2.3 firmware=N/A ip=192.168.122.1 link=no multicast=yes
  *-network:1 DISABLED
       description: Ethernet interface
       physical id: 2
       logical name: virbr0-nic
       serial: 52:54:00:50:fd:ef
       size: 10Mbit/s
       capabilities: ethernet physical
       configuration: autonegotiation=off broadcast=yes driver=tun driverversion=1.6 duplex=full link=no multicast=yes port=twisted pair speed=10Mbit/s
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.10
Release: 20.10
Codename: groovy
Linux mirko-P5QL-PRO 5.8.0-31-generic #33-Ubuntu SMP Mon Nov 23 18:44:54 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

I've tried many of the solutions found on the internet:
- setting the option 11n_disable=1 (slightly improved but still slow)
- setting the option 11n_disable=8
- edit /etc/nsswitch.conf commenting the line "hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4" and adding the line "hosts: files dns"
- disabling IPv6 support

But results are still the same and connection keeps being slow (no more than 15 MB/s vs. 300+ MB/s on my smartphones using the same network).

I hope you can help.

Thanks.
Mirko