http://bugzilla.kernel.org/show_bug.cgi?id=9153
Summary: PnPACPI ignores IOAPIC Interrupt Source Overrides
Product: ACPI
Version: 2.5
KernelVersion: up through 2.6.23
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Interrupts
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: acpi-bugzilla@lists.sourceforge.net
This problem has always been present in the PNPACPI code.
It has shown up on i386, since PNPACPI was deployed there first.
But now that PNPACPI is included in x86_64 by default also,
and so the issue will spread there too.
The workaround is to boot with "pnpacpi=off"
This issue was diagnosed by IBM here:
https://bugzilla.novell.com/show_bug.cgi?id=214809
The RTC fails in IOAPIC mode due to mis-programmed IRQ8 polarity.
There is an Interrupt Source Override for IRQ8 -- Edge LOW.
The legacy mapping implicitly asks for,
and the DSDT explicitly asks for, Edge HIGH.
Linux first programs IRQ8 according to the Interrupt Source
Override -- but PNPACPI later runs and re-programs it
according to the DSDT.
So, PNPACPI needs to learn about Interupt Source Overrides
in IOAPIC mode, and must honor them.
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