** Tags added: hwe-networking-wifi

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https://bugs.launchpad.net/bugs/1906987

Title:
  Wireless card with Intel AX200 chipset downloading very slow on Ubuntu
  20.10

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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) on other devices.

  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

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