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: [email protected]
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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