Fwd: No ac_adapter events, upower doesn't update ac adapter state - workaround

Ankur Sinha sanjay.ankur at gmail.com
Tue Apr 3 10:12:28 UTC 2012

On Tue, 2012-04-03 at 16:45 +0700, Alexander Mezin wrote:
> When I plug/unplug ac adapter, upower doesn't report that it's state
> changed, kde's power manager doesn't switch profiles. If I start with
> ac adapter plugged in and then unplug it, battery indicator shows that
> battery is discharging, but ac adapter is plugged in. Battery state is
> reported correctly. This problem exists in every linux distribution I
> tried for every kernel version from 2.6 to 3.4. Also it seems that
> this bug affects many people (open bugs in kde, upower bugtrackers).
> I found a workaround and I think I must share it. I rebuilt kernel
> with ACPI_PROCFS_POWER=y ("Deprecated power /proc/acpi directories")
> and noticed that if I do "cat /proc/acpi/ac_adapter/AC/state" then
> state of the adapter becomes correct in kde, upower's output, etc.
> I added a file to /etc/acpi/events/ with following contents:
> event=battery
> action=cat /proc/acpi/ac_adapter/AC/state > /dev/null
> After restarting acpid everything works. The only problem is that
> ACPI_PROCFS_POWER is deprecated. I hope this bug will be fixed before
> the option will be removed. And I think this workaround must be
> described somewhere in documentation/FAQ/wiki.

Dear Alexander, 

Thank you for sharing this with us. Could you also add this fix as a
comment on the bugs you're referring to, so that the maintainers may be
made aware of it? A bug on redhat.bugzilla.com against the "kernel"
component would also be good.

Ankur: "FranciscoD"


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