Intel Dual Band Wireless-AC 8260 doesn't go to monitor mode

[mrmojo]

i need to use Wireshark to look at traffic in monitor mode but my wireless adapter doesn't seem to work in monitor mode. I use Ubuntu 20.04 and the kernel version is 5.11 and the wireless drive is iwlwifi. When i manually turn the monitor mode by

sudo iwconfig wlp2s0 mode monitor

 it automatically goes back to managed mode after few seconds

i have also set the module with amsdu_size=3 value as suggested by this page but it still doesn't work

[JosueO_Intel]

Hello mrmojo,

Thank you for posting on the Intel communities. In order to have a better understanding of the issue, please share with us the following information: 

1. Was it working before? If so, when did the issue start happening?
2. Is this a desktop or a laptop?
3. Have tried using drivers by the OEM?
4. Does the issue also occur on Windows*? 
5. Is this the original adapter of the system?

Regards, 

Josue O.  

Intel Customer Support Technician

[mrmojo]

No it wasn't working before

It's a ThinkPad L380 laptop

No i haven't tried other drivers except iwlwifi which according to Linux Wireless Wiki is the driver for Intel Dual Band Wireless-AC 8265

I don't have windows so i have no idea

Yes it is the original adapter of the system

[JosueO_Intel]

Hello mrmojo,

Thank you for the information provided, it is important for you to know that the monitor mode support depends on the Linux driver. The command line '# iw list' will return what is and is not supported for his wireless card.

And check the following in the output:

Software interface modes (can always be added):

*AP/VLAN

*monitor

Also, our recommendation is to check directly with the Wi-Fi Linux community about setting up monitor mode. 

Regards, 

Josue O.  

Intel Customer Support Technician

[mrmojo]

the output of iw list does contain

Software interface modes (can always be added):

*AP/VLAN

*monitor

[JosueO_Intel]

Hello mrmojo,

Thank you for the information provided, have you checked with the Wi-Fi Linux community for assistance setting up the monitor mode? Please let me know if their recommendations help you with the issue. 

Regards, 

Josue O.  

Intel Customer Support Technician

[JosueO_Intel]

Hello mrmojo,

Were you able to check the previous post?  

Let us know if you still need assistance.  

Regards, 

Josue O.  

Intel Customer Support Technician

[JosueO_Intel]

Hello mrmojo,

We have not heard back from you, so we will close this thread. If you need any additional information, please submit a new question as this thread will no longer be monitored. 

Regards, 

Josue O.  

Intel Customer Support Technician