Slow download speed with Intel AC-9462

Hi there!
I have a very strange behaviour here with my Dell Latitude 7410 which is equipped with a non-removable Intel AC 9462 Wifi Adapter.

The mentioned device is supposed to be well supported in Linux. The following problem occurs when I connect my Laptop with the Wifi-Router of my provider (vodafone EasyBox 804):

The download speed falls down to only 1/10 of the regular speed (only 1,6 Mbit instead of 16 Mbit) while the upload speed and the Ping is working as expected. You can feel the slowness of the surfing experience.

This only happens when I am in Linux. I am using Manjaro Gnome but the same Problem occurs when I try Ubuntu 20.04. When I boot into Windows 10 I get the full download-speed connected via wifi (14-15,5 Mbit) to the same wifi router.

The behaviour of the Intel AC 9462 Wifi Adapter is even stranger. I own a devolo LAN over powerline adapter that is connected to the LAN-Port of my router and is transmitting the Internet-signal to the second floor. When I am connected to the devolo-device via wifi I get the correct speed.

Three older thinkpads an a newer Asus Zenbook (UX3430ua) and five android devices do not have this download-speed-problem with the mentioned EasyBox. The Zenbook is running Ubuntu 20.04 and my X230 is running exactly the same distro (Manjaro GNOME).

The Dell Latitude is a new device that I am planning to use as my new daily driver. When this problem should occure with other routers and accesspoints it would be a nogo for me.

I tried the latest Kernel 5.9.11-3 and also the latest LTS Kernel 5.4.80-2. It does not change anything.
In Ubuntu I was able to solve this issue temporarily by entering the following commands:
sudo modprobe iwlwifi -r and then
sudo modprobe
This commands do not work in Manjaro though.

Is there a solution for this problem in Manjaro GNOME?

Thanks in advance.

Welcome at the Manjaro forum, @Salih114

Please provide output of

sudo dmesg | grep -i iwl

In your case I would check first if maybe kernel 4.19 works better. Or you switch to testing branch and test kernel 5.10.

There is also an Ubuntu thread where it was recommended to download the firmware directly from Intel - see here - maybe this helps in your case:

You have to unzip it and place it in /lib/firmware. Then it is recommended there to run

 sudo modprobe -r iwlwifi
 sudo modprobe iwlwifi

at each boot, or you write a script or systemd service to automate that.

Also it’s worth to have a look into paragraph “iwlwifi” of Arch wiki:

https://wiki.archlinux.org/index.php/Network_configuration/Wireless#Troubleshooting_drivers_and_firmware

Also take a peek at this:

Thanks for your super fast reply! Here is my output of sudo dmesg | grep -i iwl:

[20272.833903] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[20273.002828] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[20273.513635] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[20273.679816] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[23297.444931] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[23297.613747] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[23298.033007] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[23298.199981] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[24258.490391] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[24258.659973] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[24259.310262] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[24259.476419] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[29807.920889] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[29808.088099] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[29808.540185] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[29808.706305] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[55625.634774] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[55625.801519] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[55626.663276] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[55626.831055] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[75886.472324] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[75886.640939] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[75887.067415] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[75887.233882] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[77027.178926] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[77027.347227] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[77027.878530] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[77028.045028] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[82218.493731] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[82218.661786] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[82219.077752] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[82219.244413] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[90214.662654] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[90214.830698] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[90215.268613] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[90215.434844] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[93627.395398] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[93627.563201] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[93628.080323] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[93628.246569] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[95201.708480] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[95201.877043] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[95202.415940] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[95202.582627] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[98263.172240] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[98263.341186] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[98263.856011] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[98264.022367] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[100456.764351] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[100456.933655] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[100457.487342] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[100457.653891] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[100472.610318] iwlwifi 0000:00:14.3: No beacon heard and the time event is over already...
[100490.529834] iwlwifi 0000:00:14.3: Unhandled alg: 0x71b
[110063.130031] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[110063.298491] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[110063.674344] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[110063.840522] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[112401.873041] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[112402.041679] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[112402.541979] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[112402.708344] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring

I already tried to apply the Ubuntu-solution here in Manjaro GNOME without success. I already downloaded a driver from intel and placed it in the mentioned folder. The command sudo modprobe -r iwlwifi aready results in “modprobe: FATAL: Module iwlwifi is in use.”
Am I missing something here?

I will try out the downgrade to Kernel 4.19 and post my experience. Could that lead to further disadvantages, considering that I have a quite new hardware? I was considering even Linux manjaro 5.4.80-2-MANJARO, that I am using at the moment, to be a reasonable compromise between stability and freshness.

Thanks for your quick reply,

I also will try these options in [ /etc/modprobe.d/iwlwifi.conf] before I downgrade my Kernel to 4.19.
This mentioned file did not exist, so I had to create it. Let’s see what I get there.
I will post my results as soon as possible.

Hi cscs,
the settings in /etc/modprobe.d/iwlwifi.conf you were pointing at did not work.

Thank you anyway.

Hello Wollie,
now I’ve tried kernels 5.10 and 4.19. In the case of 5.10 the problem persists. The kernel 4.19 does not boot properly with my quite new hardware (GUI does not start and there are errors during loading TPM modules).
I noticed something else: my Wifi-adapter is in fact an Intel Wifi 6 AX201 and so it is recognized and configured in Windows. On Manjaro my wifi-adapter is detected as Intel AC 9462 according to “lshw -c network”.
“dmesg | grep iwlwifi” lists my wifi-adapter correctly as Intel Wifi 6 Ax201.
Could that by the source of my wifi-issue?

Thanks in advance.

Hello there!
There seemed to be no way to solve the speed issues that I had when my laptop (dell latitude 7410) was connected to the “vodafone EasyBox 804” router.
Trying out connectivity speed in different wifi networks at my work and at the homes of people that I visited in the past months (not too many because of the covid 19 restrictions) proved that the issue only occurs with this router. I finally replaced it by an used fritz!box that I got for free and now I have absolute no issues.
Thank you all anyway.