http://bugzilla.kernel.org/show_bug.cgi?id=1752





------- Additional Comments From [EMAIL PROTECTED]  2006-01-29 00:15 -------
PIC-mode bits look normal too.
Same exercise: print_PIC()
from acpi_irq() when it finds work to do.

The 1st one is presumably a real interrupt:

printing PIC contents
... PIC  IMR: 2678
... PIC  IRR: 0000
... PIC  ISR: 0000
... PIC ELCR: 0a80

The 6 in IMR 2678 means bit 9 1, so IRQ9 is masked = DISABLED --
which makes sense since we're printing this from its handler...
ELCR a80 has bit 9 is set meaning IRQ9 is LEVEL sensitive,
just like IRQ 7 and 11 -- as expected.

Later when invoked via irqpoll...
printing PIC contents
... PIC  IMR: 2479
... PIC  IRR: 0000
... PIC  ISR: 0000
... PIC ELCR: 0a80

The 4 in IMR means that bit 9 is now CLEAR,
which means that IRQ9 is indeed UNMASKED and ready for action --

So in both the PIC and IOAPIC cases, the interrupt controller
sits ready for the SCI, but the input pin is not being driven
again after its first invocation.


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