[BUG] wifi: iwlwifi driver does not detect the card in Linux 6.16

[BUG] wifi: iwlwifi driver does not detect the card in Linux 6.16

[Ryan Chung]

Hi. I have been trying to build the mainline on my laptop and have
been facing a weird issue. I have been able to use WIFI on my
linux-6.11.0-25-generic on my Ubuntu 24.04. However, on my newest
build (linux-6.16.0-rc1), I can't use my WIFI. Secure boot is off.

I have realized that kernels built with 'make defconfig' would simply
not boot up after adding to grub. Therefore, I copied the .config from
the generic and changed the following two configs:

CONFIG_SYSTEM_ TRUSTED KEYS=””
CONFIG_SYSTEM_REVOCATION_KEYS=""

They initially required .pem files, but the original .config will not
compile as it created errors and were therefore modified.

I also checked the bottom configs and they seemed to be set correctly.
CONFIG_IWLWIFI=m
CONFIG_IWLMVM=m

Below are some additional information:
- Network controller [0280]: Intel Corporation Device [8086:a840] (rev 10)
- I was able to find my card (A840/00E4) in drv.c
- When running 'lspci -nnk | grep -iA3 network', iwlwifi is NOT listed
as a kernel driver.
- Running 'sudo modprobe iwlwifi' does work

Please let me know if there are ways to fix the issue. If given the
guidance, I would be glad to work on it and write the necessary
patches. Thank you.

Best regards,
Ryan Chung

Re: [BUG] wifi: iwlwifi driver does not detect the card in Linux 6.16

[Johannes Berg]

On Mon, 2025-06-16 at 16:26 +0900, Ryan Chung wrote:
> I also checked the bottom configs and they seemed to be set correctly.
> CONFIG_IWLWIFI=m
> CONFIG_IWLMVM=m
> 
> Below are some additional information:
> - Network controller [0280]: Intel Corporation Device [8086:a840] (rev 10)
> - I was able to find my card (A840/00E4) in drv.c

There's a bug with the recognition of these devices, please set
CONFIG_IWLMLD as a workaround for now.

We'll also have a patch to fix this, but looks like it's not on the way
yet.

johannes