I'm also hitting this issue on Acer Aspire One d150 - Karmic NBR with
latest updates

Nov  4 22:43:32 fish-laptop kernel: [   75.578555] ath5k phy0: noise floor 
calibration timeout (2412MHz)
Nov  4 22:43:32 fish-laptop kernel: [   75.680194] ath5k phy0: noise floor 
calibration failed (2417MHz)
Nov  4 22:43:32 fish-laptop kernel: [   76.082569] ath5k phy0: noise floor 
calibration timeout (2422MHz)
Nov  4 22:43:34 fish-laptop wpa_supplicant[1124]: CTRL-EVENT-SCAN-RESULTS 
Nov  4 22:44:12 fish-laptop kernel: [  115.529736] ath5k phy0: noise floor 
calibration failed (2412MHz)
Nov  4 22:44:12 fish-laptop kernel: [  115.630263] ath5k phy0: noise floor 
calibration failed (2417MHz)
Nov  4 22:44:12 fish-laptop kernel: [  115.990275] ath5k phy0: noise floor 
calibration failed (2422MHz)
Nov  4 22:44:13 fish-laptop wpa_supplicant[1124]: CTRL-EVENT-SCAN-RESULTS 
Nov  4 22:45:12 fish-laptop kernel: [  175.406822] ath5k phy0: noise floor 
calibration failed (2412MHz)
Nov  4 22:45:12 fish-laptop kernel: [  175.504132] ath5k phy0: noise floor 
calibration failed (2417MHz)
Nov  4 22:45:12 fish-laptop kernel: [  175.702510] ath5k phy0: noise floor 
calibration failed (2422MHz)
Nov  4 22:45:13 fish-laptop wpa_supplicant[1124]: CTRL-EVENT-SCAN-RESULTS 
Nov  4 22:46:32 fish-laptop kernel: [  255.591596] ath5k phy0: noise floor 
calibration failed (2412MHz)
Nov  4 22:46:32 fish-laptop kernel: [  255.687784] ath5k phy0: noise floor 
calibration failed (2417MHz)
Nov  4 22:46:32 fish-laptop kernel: [  256.052286] ath5k phy0: noise floor 
calibration failed (2422MHz)
Nov  4 22:46:34 fish-laptop wpa_supplicant[1124]: CTRL-EVENT-SCAN-RESULTS 
Nov  4 22:48:12 fish-laptop kernel: [  355.391029] ath5k phy0: noise floor 
calibration failed (2412MHz)
Nov  4 22:48:12 fish-laptop kernel: [  355.490069] ath5k phy0: noise floor 
calibration failed (2417MHz)
Nov  4 22:48:12 fish-laptop kernel: [  355.762439] ath5k phy0: noise floor 
calibration failed (2422MHz)
Nov  4 22:48:13 fish-laptop wpa_supplicant[1124]: CTRL-EVENT-SCAN-RESULTS

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ath5k phy0: noise floor calibration *failed* (not *timeout*)
https://bugs.launchpad.net/bugs/435808
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