I installed "linux-backports-modules-cw-3.3-precise-generic". No "ath5k phy0: gain calibration timeout".
~$ dmesg | grep ath [ 9.817315] ath5k 0000:14:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19 [ 9.817328] ath5k 0000:14:00.0: setting latency timer to 64 [ 9.817411] ath5k 0000:14:00.0: registered as 'phy0' [ 10.397277] ath: EEPROM regdomain: 0x65 [ 10.397281] ath: EEPROM indicates we should expect a direct regpair map [ 10.397287] ath: Country alpha2 being used: 00 [ 10.397289] ath: Regpair used: 0x65 [ 10.476684] ath5k phy0: Atheros AR2425 chip found (MAC: 0xe2, PHY: 0x70)
~$ uname -a Linux buzz-dee-laptop 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
I installed "linux- backports- modules- cw-3.3- precise- generic" . No "ath5k phy0: gain calibration timeout".
~$ dmesg | grep ath
[ 9.817315] ath5k 0000:14:00.0: PCI INT A -> GSI 19 (level, low) -> IRQ 19
[ 9.817328] ath5k 0000:14:00.0: setting latency timer to 64
[ 9.817411] ath5k 0000:14:00.0: registered as 'phy0'
[ 10.397277] ath: EEPROM regdomain: 0x65
[ 10.397281] ath: EEPROM indicates we should expect a direct regpair map
[ 10.397287] ath: Country alpha2 being used: 00
[ 10.397289] ath: Regpair used: 0x65
[ 10.476684] ath5k phy0: Atheros AR2425 chip found (MAC: 0xe2, PHY: 0x70)
~$ uname -a
Linux buzz-dee-laptop 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux