1. ath5k phy0: gain calibration timeout
NetworkManager shows wireless as disconnected and doesn't search/find for wlans. To fix this, you just have to completely shutdown the laptop and then power on (reboot doesn't seem to do the trick)
2. Laptop battery critically low. Computer will hibernate very soon unless it is plugged in.
When the power cord is disconnected, a popup appears with this message, no matter how full the battery is. That's why some fucked up batteries, BIOSes when you disconnect the power cord, they mistakenly show - 0:04 remaining (92%) - in the popup from the power manager. So it actually thinks it only has 4 minutes left, and wants to hibernate, although you still have 92% of battery left. So to avoid this crap, go to gconf-editor > apps > gnome-power-manager > general and uncheck "use_time_for_policy". So, next time you disconnect the power cord, it will use percentage to calculate if it's time to suspend or hibernate.