Messages in this thread | | | Date | Mon, 11 Oct 2004 13:42:11 +0200 | From | Andi Kleen <> | Subject | Re: [ACPI] Re: [BKPATCH] LAPIC fix for 2.6 |
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On Sun, Oct 10, 2004 at 05:47:05PM -0700, Linus Torvalds wrote: > > > On Sun, 10 Oct 2004, Maciej W. Rozycki wrote: > > > > Hmm, any particular reason to keep the local APIC disabled by default? > > Yes. It changes interrupt handling, so any SMM stuff tends to break on > BIOSes that don't know about APICs. Things like the magic keys etc. It > apparently also breaks some ACPI stuff (likely AML code that "knows" that > interrupts are done with the legacy controller). > > Mostly a laptop issue, I suspect - simply because desktops don't do > anything strange these days.
It's more than a laptop issue. Especially older desktops still don't work with APIC by default, and even a lot of modern ones have problems.
It works around ACPI bugs. Some common issues I ran into on x86-64: nvidia nforce2/3 is still often broken because of the bogus timer override so many BIOS have) Some VIA K8 boards get mysterious IDE DMA errors after some time when the APIC is on.
[Patch for the Nvidia thing is pending - just always ignore it - but not submitted yet for i386 yet. x86-64 has it fixed in -mm*]
-Andi
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