Trying what Tim said:

Previous behavior:

On 2.6.24-19 kernel, with linux-backports-modules-2.6.24-19 installed:
sudo modprobe -r iwl3945 --> The module is correctly unloaded
sudo modprobe iwl3945 --> The module is correctly loaded

On 2.6.24-20 kernel, with linux-backports-modules-2.6.24-20 installed:
sudo modprobe -r iwl3945 --> kernel panic (I have an Intel 3945 wifi chipset)

--- I uninstalled linux-backports-modules-2.6.24-20 and rebooted ---

New behavior:

On 2.6.24-19 kernel, with linux-backports-modules-2.6.24-19 installed :
sudo modprobe -r iwl3945 --> The module is correctly unloaded
sudo modprobe iwl3945 --> The module is correctly loaded

On 2.6.24-20 kernel, with linux-backports-modules-2.6.24-20 NOT installed :
sudo modprobe -r iwl3945 --> The module is correctly unloaded
sudo modprobe iwl3945 --> The module is correctly loaded

So this bug is definitely related to the Intel WiFi driver that is in
the linux-backports-modules-2.6.24-20

** Changed in: linux-backports-modules-2.6.24 (Ubuntu)
       Status: New => Confirmed

** Summary changed:

- linux-image-2.6.24-20-generic causes kernel panic upon suspend
+ linux-backports-modules-2.6.24-20-generic causes kernel panic when unloading 
Intel Wireless driver

** Description changed:

- Binary package hint: linux-image-2.6.24-20-generic
+ Having an Intel 3945ABG WiFi chipset :
  
- Ubuntu 8.0.4.1
+ Actual behavior:
  
- attempting to suspend to RAM causes kernel panic
- see attached output of lshw
+ On 2.6.24-19 kernel, with linux-backports-modules-2.6.24-19 installed:
+ sudo modprobe -r iwl3945 --> The module is correctly unloaded
+ sudo modprobe iwl3945 --> The module is correctly loaded
+ 
+ On 2.6.24-20 kernel, with linux-backports-modules-2.6.24-20 installed:
+ sudo modprobe -r iwl3945 --> kernel panic (I have an Intel 3945 wifi chipset)
+ 
+ --- I uninstalled linux-backports-modules-2.6.24-20 and rebooted ---
+ 
+ New behavior:
+ 
+ On 2.6.24-19 kernel, with linux-backports-modules-2.6.24-19 installed :
+ sudo modprobe -r iwl3945 --> The module is correctly unloaded
+ sudo modprobe iwl3945 --> The module is correctly loaded
+ 
+ On 2.6.24-20 kernel, with linux-backports-modules-2.6.24-20 NOT installed :
+ sudo modprobe -r iwl3945 --> The module is correctly unloaded
+ sudo modprobe iwl3945 --> The module is correctly loaded
+ 
+ 
+ Same thing with iwl4965 for people who have an Intel 4965AGN WiFi chipset.
+ 
+ This bug occurs every time the driver is unloaded, including suspending
+ to RAM, but not while shutting down completely the system.

-- 
linux-backports-modules-2.6.24-20-generic causes kernel panic when unloading 
Intel Wireless driver
https://bugs.launchpad.net/bugs/251252
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