I just tested to remove the ath5k atheros driver (provided by linux-backports-modules) in System/Admin/Hardware and this solves the problem in this bug, i.e. "roaming ot (none)..." don't occur anymore. However, without ath5k the default ath_pci module (madwifi) is used, which for me gives intermittent kernel panic freezes as described in the bug quoted above.
I just tested to remove the ath5k atheros driver (provided by linux-backports -modules) in System/ Admin/Hardware and this solves the problem in this bug, i.e. "roaming ot (none)..." don't occur anymore. However, without ath5k the default ath_pci module (madwifi) is used, which for me gives intermittent kernel panic freezes as described in the bug quoted above.