Bug#681232: linux-image-3.2.0-3-amd64: Atheros WiFi Adapter couldn't find networks "gain calibration timeout"
I have this issue as well, my wireless NIC is:
01:07.0 Ethernet controller : Atheros Communications Inc. AR5212/AR5213 Wireless Network Adapter [168c:0013] (rev 01)
Subsystem: D-Link System Inc AirPlus DWL-G520 Wireless PCI Adapter (rev. B) [1186:3a13]
Flags: bus master, medium devsel, latency 168, IRQ 17
Memory at fdef0000 (32-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: ath5k