Comment 24 for bug 1283589

While the power supply device (ADP1) seems to always understand when the cord is plugged in and removed, the battery (BAT1) does not seem to know when it is discharging or not.

Samsung Series 9 np900x4b with Fedora 17

$ uname -a
Linux Lethe 3.4.4-3.fc17.x86_64 #1 SMP Tue Jun 26 20:54:56 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

(Results of acpi -i -b -a)
*** AC PLUGGED IN ***
Battery 0: Full, 100%
Battery 0: design capacity 8400 mAh, last full capacity 8500 mAh = 100%
Adapter 0: on-line

*** AC REMOVED ***
Battery 0: Charging, 100%, until charged
Battery 0: design capacity 8400 mAh, last full capacity 8500 mAh = 100%
Adapter 0: off-line

*** System Suspended and woken back up ***

*** AC STILL REMOVED ***
Battery 0: Discharging, 100%, 06:33:49 remaining
Battery 0: design capacity 8400 mAh, last full capacity 8500 mAh = 100%
Adapter 0: off-line

*** AC PLUGGED IN ***
Battery 0: Unknown, 98%
Battery 0: design capacity 8400 mAh, last full capacity 8500 mAh = 100%
Adapter 0: on-line

*** SUSPEND AND WAKE ***

*** AC PLUGGED IN ***
Battery 0: Unknown, 98%
Battery 0: design capacity 8400 mAh, last full capacity 8500 mAh = 100%
Adapter 0: on-line

*** AC REMOVED ***
Battery 0: Charging, 98%, charging at zero rate - will never fully charge.
Battery 0: design capacity 8400 mAh, last full capacity 8500 mAh = 100%
Adapter 0: off-line

The same information is reflected when looking directly at the sysfs enteries.
/sys/class/power_supply/ADP1/online shows the correct status all the time. (1 for online, 0 offline)

/sys/class/power_supply/BAT1/status will show the correct status after a fresh suspend, reflecting the above results.