My card is:
Device: 0b:00.0
Class:  Network controller
Vendor: Atheros Communications Inc.
Device: AR5418 802.11abgn Wireless PCI Express Adapter
SVendor:        Apple Computer Inc.
SDevice:        Device 0087
Rev:    01

OS: Intrepid/AMD64, 2.6.27-5.

When the router (Linksys WRT160N) operates in 'Mixed' mode (e.g. the
N-mode is enabled) the ath9k causes the system to freeze completely
after several seconds (sometimes after several minutes) of traffic
activity. I tried in both the wide-channel (40MHz) mode and standard
channel mode.

I cannot see any logging or crash reports. Keyboard leds are not working
so this is a hard lockup.

When the router operates in G-only mode the driver seems to work properly, 
although I get in the syslog the following events:
"ACPI: EC: GPE storm detected, disabling EC GPE"
"ACPI: EC: missing confirmations, switch off interrupt mode."

-- 
ath9k makes ubuntu Intrepid Ibex 8.10 alpha 6 crash
https://bugs.launchpad.net/bugs/272156
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