[Testing - Trixie] Error building missing btintel_pcie module for BT on Intel BE201

[TheNino]

I've installed Testing on a Dell XPS 13 9359 with Lunar Lake 258V and a BE201 Wi-Fi/BT network device.

The WiFi works correctly with the iwlwifi module and the firmware which is already available in the deb package.
Instead, the Bluetooth device is not working due to missing driver and firmware. The firmware is available in the firmware git repo, but the module is missing (I've checked both config file in /boot directory and linux-config-6.12 package).
The module solves the issue, as can be seen when testing an Ubuntu 24.10 live stick.

After installing the required package dependencies, I've tried an in-tree build of the module with the following procedure:

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sudo apt install linux-source-6.12
mkdir ~/kernel
cd ~/kernel
tar xf /usr/src/linux-source-6.12.tar.xz
cp /boot/config-6.12.6-amd64 .config
cp /usr/src/linux-headers-6.12.6-amd64/Module.symvers .
make clean

I've set CONFIG_BT_INTEL_PCIE=M (verified with grep on the saved .config file) using

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make menuconfig

Then, I've compiled the module with
make module_prepare
make M=drivers/bluetooth

The building ends without any error or warning, but trying to load the modules with

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sudo insmode drivers/bluetooth/btintel_pcie.ko

Which step I've missed or is wrong?
I get the following error:

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insmod: ERROR: could not insert module drivers/bluetooth/btintel_pcie.ko: Invalid module format

Checking dmesg I get the following error:

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module btintel_pcie: .gnu.linkonce.this_module section size must match the kernel's built struct module size at run time 

Checking with modinfo the module, I see

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vermagic: 6.12.6 SMP preempt mod_unload modv versions

while checking a module in the kernel package (e.g., btintel) I see

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vermagic: 6.12.6-amd64 SMP preempt mod_unload modv versions

The same happens if I disable the signature with

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./script/config --disable MODULE_SIG

[Aki]

Hello

[..]
I've set CONFIG_BT_INTEL_PCIE=M (verified with grep on the saved .config file) using

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make menuconfig

Then, I've compiled the module with
make module_prepare
make M=drivers/bluetooth
[/code]

If I remember correctly, if you change a CONFIG_* parameter (as CONFIG_BT_INTEL_PCIE) you need to rebuild the entire kernel and its modules. So, probably you need to build a new custom kernel package.

The building ends without any error or warning, but trying to load the modules with

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sudo insmod drivers/bluetooth/btintel_pcie.ko

Which step I've missed or is wrong?
I get the following error:

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insmod: ERROR: could not insert module drivers/bluetooth/btintel_pcie.ko: Invalid module format

Checking dmesg I get the following error:

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module btintel_pcie: .gnu.linkonce.this_module section size must match the kernel's built struct module size at run time 

The CONFIG_MODULE_COMPRESS_XZ kernel options has been activated by default in Debian for linux kernel version 6.12.

After that, the binary format of kernel module has been changing from ".ko" to ".ko.xz" (they are now also compressed in xz format) and also extensions of file name of kernel modules changed.

Hope this helps.