Hi All,
I'm wondering if anyone out there can offer any hints for finding a
missing interrupt.
I've got box here where the front-panel power button has never worked -
it doesn't shut the system down. I thought I'd look into it - how hard
can it be to make an off switch work, I thought. (People familiar with
ACPI will be laughing out loud at this point.)
Anyway, it turns out the power button doesn't work because the ACPI
interrupt never appears, at least according to vmstat -i. Building the
ACPI module with debug shows that it seems to be doing all the right
things - it figures out where the registers are in i/o space, enables
ACPI, installs a handler and unmasks the power button as an interrupt
source. And pressing the button *does* toggle the corresponding status
bit, so the hardware really ought to be generating an interrupt at this
point.
So, either I still have some ACPI (or BIOS or hardware) misconfiguration
which means the interrupt isn't being generated as advertised, or I have
some sort of interrupt handling misconfiguration which means the
interrupt's not getting through to the handler. Can anyone make any
suggestions as to how I might diagnose which it is?
I did take a look through the FreeBSD ACPI mailing list (I'm assuming
the Dragonfly code's still pretty similar) but found only lots of
problems with interrupt storms, not interrupt droughts.
Thanks in advance!
--
David Murray
