I've got a Asus TX300 running Ubuntu 13.04. This is a laptop tablet hybrid which has secondary battery in the dock. This battery is not detected by Ubuntu as far as I can see.
Ran this while docked:
user@TX300:/sys/devices/platform$ dmesg |grep batt [ 1.691787] ACPI: Battery Slot [BAT0] (battery present)
Also looked in
/sys/class/power_supply/ and other tips I've found, but there's no trace of the extra battery.
Any help appreciated.
I ran the battery all the way down until the unit suspended. When I closed the lid after it hibernated the led indicator changed from blinking to static, indicating it was charging. When I woke up this morning it had indeed been charged by the secondary battery but it still doesn't seem to be found by the OS.