kern/173408: ACPI Regression: battery does not update often

David Demelier demelier.david at
Mon Nov 5 22:40:01 UTC 2012

>Number:         173408
>Category:       kern
>Synopsis:       ACPI Regression: battery does not update often
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Nov 05 22:40:00 UTC 2012
>Originator:     David Demelier
>Release:        9.1-RC2
FreeBSD 9.1-RC2 FreeBSD 9.1-RC2 #2: Wed Oct 10 18:36:52 CEST 2012     root at  amd64

The battery info shown in hw.acpi.battery sysctl nodes or info provided by acpiconf(8) does not update as often as FreeBSD 8.1.

If I run on battery, I must wait a while until the remaining capacity or remaining time change, I know that could be very great if real.. but that is very annoying now as I don't know when the percentage will decrease..

For instance, I started using my laptop, the charge was 89%, after 30 minutes of use (with processes that use a lot of cpu) 30 minutes passed the state is still to 89%.

This does not happend on 8.1 and not 9.0 both -RELEASE

Don't know, what I know is that HP laptop BIOSes usually send to the OS the current battery state each second (or something similar).

We noticed this with a NetBSD developer because the kernel was emitting a message about the battery something like each second.


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