Comment 119 for bug 971809

The debug information aren't present in the logs. Check if these options are present in the kernel config:

CONFIG_ATH_DEBUG=y
CONFIG_ATH9K_DEBUGFS=y

Also, in your distribution, /var/log/syslog appears to contain both kernel and NM messages. That would be useful to have.

ath9k messages would look like this: http://pastebin.com/gzcdX8mV