ath9k: AR9462 btcoex doesn't appear to work

[Sherwin Soltani <sherwin@wybc.com>]

Hello,

I have an Acer Aspire V5-571 which contains the AR9462 chipset (PCI ID 
168c:0034), supported by the ath9k driver. This chipset claims to 
support Bluetooth coexistence. However, after booting up, my kernel does 
not register any Bluetooth devices.

I am using kernel version 3.6.0-999-generic (apw@gomeisa) (gcc version 
4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5)). I also tried 3.4 and 3.2 kernels 
without success. Additionally, I can try to do

rmmod ath9k && modprobe ath9k btcoex_enable=1

In the message log, I can see this:

[ 1204.643120] ath9k: ath9k: Driver unloaded
[ 1214.203099] ath: phy1: Disabling ASPM since BTCOEX is enabled
[ 1214.203105] ath: EEPROM regdomain: 0x6a
[ 1214.203106] ath: EEPROM indicates we should expect a direct regpair map
[ 1214.203108] ath: Country alpha2 being used: 00
[ 1214.203109] ath: Regpair used: 0x6a

However 'hcitool dev' shows no devices after this operation.

Looking back through the ath9k-devel list, I can see that there was some 
discussion on this chipset, but it seems that Bluetooth functionality 
wasn't tested with it. Is this a known problem? Is there any information 
I can supply to help fix it?

Aside from the Bluetooth problems, there are also problems with 
frequently dropping signals (even when I am very close to the access 
point), but right now that's a secondary concern to Bluetooth for me.

Thanks,

Sherwin Soltani