DevKit-Power doesn't detect the system is running on battery power if you boot your laptop without AC power

Richard Hughes hughsient at
Tue Nov 17 14:16:33 PST 2009

2009/11/17 Emilio López <buhitoescolar at>:
> emilio at laptop:~$ ls /sys/class/power_supply

There's the problem.

> emilio at laptop:~$ cat /proc/acpi/battery/BAT1/state
> present:                 yes
> capacity state:          ok
> charging state:          discharging
> present rate:            2056 mA
> remaining capacity:      1956 mAh
> present voltage:         10699 mV
> The battery magically appears, and all the actions get triggered (like
> lowering screen brightness).
> emilio at laptop:~$ ls /sys/class/power_supply

That's insane. Your battery driver is broken.

> It seems that cheching that /proc/acpi/battery/BAT1/state makes
> devkit-power aware of the battery. Any thoughts?

Are you using a custom kernel battery driver? Is the source available?


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