AX200: Channel list change while connected in Wifi direct

[BartThoelen]

Dear,

I have an application where we interconnect two AX200 devices via Wi-Fi direct (P2P). The application is running on a custom board, using a custom build Linux and the iwlwifi backport driver. wpa_supplicant is used as p2p-stack. Connections are setup on the 5GHz band.

Sometimes, while connected, I see a channel list update event sent from the AX200 module, which tells none of the 5 GHz channel can used anymore (they are no longer listed as usable channels).

What could be the reason the AX200 tells the channels cannot be used anymore?

Thanks,

BartT

[Mike_Intel]

Hello BartThoelen,

Thank you for posting in Intel community Forum.

For me to further check this, please help provide the following details:

1. Are you designing a system with embedded AX200?
2. Can you tell me more about the design or set up that you are doing?
3. How can we simulate the error? Can you provide steps?

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello BartThoelen,

I hope this message finds you well. 

Were you able to check the previous post?

Please let us know if you still need assistance.

Best regards,

Michael L.

Intel Customer Support Technician

[BartThoelen]

Hi Michael,

Let me answer your questions:

1. Are you designing a system with embedded AX200?
   Yes.
2. Can you tell me more about the design or set up that you are doing?
   The system uses Wi-Fi direct to interconnect two of such systems. One is the group owner, the other connect to that group. But at boot time, the second also creates a group, to be discovered by the first so it can sent in invite to the second. This is working fine and connection setup work like a charm. But while connect, I sees sometimes the the AX200 sends a channel list change event, where that list only contains channels on the 2100 band and no channel on the 5GHz band. While wpa_supplicant is handling this very well - the connection continuous to work on the 2100 band - I would like to know what could be cause the AX200 sends this channel list change.
3. How can we simulate the error? Can you provide steps?
   I have no idea how to simulate this as I don't have the root cause ;). Furthermore, this is no an error. I just want to know why the channel list event event is sent and why the 5GHz channels are no longer listed. 
   
   

[Mike_Intel]

Hello BartThoelen,

Thank you for the information provided.  

I will do further research on this matter and post the response on this thread once it is available.

Please let us know if you still need assistance.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello BartThoelen,

I hope this message finds you well.

To troubleshoot the issue that you mentioned, please follow the steps below:

Step 1: Verify Kernel Compatibility: Check if the kernel version that you are using supports the device. Refer to the table of wireless adapters and corresponding kernel versions at: https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi. The latest firmware versions can be found at: https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/. If the kernel version matches the wireless adapter, pleaseproceed to Step 2.

Step 2: Confirm Wireless Adapter Connection:  Please enter the command # lspci in the terminal. Ensure the Intel network controller is recognized. If not, the system may not identify the Intel network adapter, and you should verify proper integration, possibly seeking assistance from the system manufacturer. If the wireless adapter is correctly identified, move to Step 3.

Step 3: Determine if it's an iwlwifi Issue: Please enter # modinfo iwlwifi in the terminal. If there's no output, the module isn't installed, indicating a distribution installation issue. Then, type # lsmod | grep iwlwifi. If the result is empty, the driver hasn't been loaded, likely due to a distribution issue. To confirm, type # dmesg | grep iwlwifi. If the result is empty, the driver wasn't initialized, pointing to a distribution issue. If populated, proceed to Step 4.

Step 4: Verify Firmware Installation: Enter # dmesg | grep “no suitable firmware found!”. If the result is not empty, the system lacks suitable firmware (as indicated in dmesg). Recommend visiting https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi for supported firmware or https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git/ for the latest versions.

Step 5: Further Diagnostics: If previous steps didn't resolve the issue, type # dmesg | grep ASSERT. If the output is empty, follow the wiki at https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi/debugging to extract dmesg and trace-cmd. If the output contains values, collect the firmware dump from the wiki as well.

Additionally, since you are developing a system with an embedded AX200, please provide the make and model of the motherboard that you are using.

You may also check our Linux* Support for Intel® Wireless Adapters article. 

Please tell us if the above steps were able to help you.

If you have questions, please let us know. Thank you.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello BartThoelen,

I hope you are doing great.

I am just checking if you were able to review my last post.

Please let us know if you still need assistance.

Best regards,

Michael L.

Intel Customer Support Technician

[Mike_Intel]

Hello BartThoelen,

I hope you are having a good day.

I am sending another follow up to check if you tried the recommendations that we provided. 

Since we have not heard back from you, I need to close this inquiry. 

If you need further assistance, please post a new question as this thread will no longer be monitored. 

Thank you and have a great day. 

Best regards,

Michael L.

Intel Customer Support Technician

[BartThoelen]

Hi Michael,

Yes, I did all of the proposed, and for all I can say result is OK. These is no problem with the board, as such it is in non working state.

The original question was:

"

I have an application where we interconnect two AX200 devices via Wi-Fi direct (P2P). The application is running on a custom board, using a custom build Linux and the iwlwifi backport driver. wpa_supplicant is used as p2p-stack. Connections are setup on the 5GHz band.

Sometimes, while connected, I see a channel list update event sent from the AX200 module, which tells none of the 5 GHz channel can used anymore (they are no longer listed as usable channels).

What could be the reason the AX200 tells the channels cannot be used anymore?

"

This means, it's a working system, for 99% of the time. Once in a while, the AX200 module report a channel list change. My question is: What is reason the AX200 can send a channel list change?

Regards,

Bart.