[Bug 162859] [acpi] ACPI battery/acline monitoring partialy working (switching)

[Ian Smith]

On Sat, 3 Jan 2015 11:45:05 +0000, bugzilla-noreply at freebsd.org wrote:

Please excuse this off-'zilla merely speculative response.  No time, but 
I've spent (wasted?) some time chasing a couple of these outside the PR.

 > https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=162859
 > 
 > --- Comment #14 from juris <juris.kaminskis at gmail.com> ---
 > Problem on /head/ branch is introduced with revision 216942.

If true (in all cases) this is great news for those with a variety of HP 
laptops that have been experiencing partial - or in some cases complete 
after boot - failures in CMBAT monitoring since 9.0.  And a Macbook Pro.

So, reverting rev 216942 fixes it for you?  On what FreeBSD version?

If so, with scant comprehension of the code, questions that occur:

a) did that revision fix some existing problem, the reverting of which 
might reestablish problem/s in other machines?  jkim?

b) what is it in various HP ACPI implementations that don't seem to be a 
reported problem on other hardware, particularly concerning EC handling?

c) if this was wrong (for HPs), what would be right?  (the hard one :)

cheers, Ian