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Hi,

I've spent most of the last 24 hours tracking a bug that made envstat(8)
show bogus values for the status of my battery.

(Very) long story short, the reason for that behaviour is that the
sensors from acpi_bat(4) and acpi_acad(4) (and maybe acpi_tz(4), too)
are queried before interrupts are enabled.

I haven't finished tracking exactly why they need interrupts, but I
guess the ACPI embedded controller kind of reports back to the driver
at this point, and when that reporting fails, I end up with bogus
values.

Initially I only config_interrupts()'d the envsys attachment for
acpi_bat(4) and it wasn't enough, so I did the same for acpi_acad(4)
and acpi_tz(4), and now it just works.

I'm wondering if other people are in a similar situation, and whether
or not we should accept that kind of requirement from an ACPI
implementation, and of course, if we should comply.

While deferring the attachment to envsys(9) is very easy to do and not
really meaningless, it obviously break apm@acpi, and I don't see an easy
way of working around that.  Not that I care a lot about that hack,
though.  Besides, I lost a lot of time because of it.

Thoughts?

--=20
Quentin Garnier - cube@cubidou.net - cube@NetBSD.org
"You could have made it, spitting out benchmarks
Owe it to yourself not to fail"
Amplifico, Spitting Out Benchmarks, Hometakes Vol. 2, 2005.

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