Comment 12 for bug 289356

I have a similar but a slightly different problem. I have a Macbook 2,1. Wifi works fine after a reboot (and no "unable to set channel" in dmesg so this problem is fixed) but it does not connect to an access point after suspend to RAM. Unloading and reloading ath9k cures the problem (so a simple workround can be put into the suspend scripts) but, as the original poster writes, after the second reload NetworkManager hangs and one cannot even do ifconfig without a lockup.

The problem is present with linux-image-2.6.27-11-generic and linux-image-2.6.27-12-generic

lspci -v shows

02:00.0 Network controller: Atheros Communications Inc. AR5008 Wireless Network Adapter (rev 01)
        Subsystem: Apple Computer Inc. Device 0087
        Flags: bus master, fast devsel, latency 0, IRQ 17
        Memory at 50100000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: [40] Power Management version 2
        Capabilities: [50] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
        Capabilities: [60] Express Legacy Endpoint, MSI 00
        Capabilities: [90] MSI-X: Enable- Mask- TabSize=1
        Capabilities: [100] Advanced Error Reporting <?>
        Capabilities: [140] Virtual Channel <?>
        Kernel driver in use: ath9k
        Kernel modules: ath9k

uname -a

Linux macbook 2.6.27-12-generic #1 SMP Thu Feb 5 09:26:35 UTC 2009 i686 GNU/Linux