* Ingo Molnar <mingo@xxxxxxx> wrote: > > [ 27.097095] ENABLING IO-APIC IRQs > > [ 27.097287] ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1 > > [ 27.107291] ..MP-BIOS bug: 8254 timer not connected to IO-APIC > > [ 27.107343] ...trying to set up timer (IRQ0) through the 8259A ... failed. > > [ 27.107346] ...trying to set up timer as Virtual Wire IRQ... failed. > > [ 27.117353] ...trying to set up timer as ExtINT IRQ... works. > > > > The last 4 lines above are not logged without that argument. So my > > theory ATM is that this forced the kernel to initialize something in > > the boards registers that it does not initialize without that > > command, and that its going fubar as shown in the msg quoted above > > is a totally random thing, perhaps dependent on the phase of one of > > jupiters moons as to what state it powers up in. And I got lucky, > > so far in that my single powerdown reset didn't trigger it again... > > And you _know_ what that knocking sound is by now. :) > > that's weird. Could you try the hack below and _remove_ the > acpi_use_timer_override flag? The change should artificially cause the > above 4 lines to appear again, in all cases. > > This would test the following aspects of your theory: is this unknown > side-effect of the the acpi_use_timer_override flag related to the > timer setup sequence in io_apic_32.c? If not, then the difference most > likely lies in the different ACPI setup sequence. i tried that patch on a box here, and it produces similar 4 lines: [ 0.172141] ENABLING IO-APIC IRQs [ 0.175498] init IO_APIC IRQs [ 0.176059] IO-APIC (apicid-pin) 2-16, 2-17, 2-18, 2-19, 2-20, 2-21, 2-22, 2-23 not connected. [ 0.187942] ..TIMER: vector=0x31 apic1=0 pin1=0 apic2=-1 pin2=-1 [ 0.233859] ..MP-BIOS bug: 8254 timer not connected to IO-APIC [ 0.236014] ...trying to set up timer (IRQ0) through the 8259A ... failed. [ 0.236014] ...trying to set up timer as Virtual Wire IRQ... failed. [ 0.236014] ...trying to set up timer as ExtINT IRQ... works. [ 0.277879] Using local APIC timer interrupts. but ... in all likelyhood it's some ACPI side-effects of the acpi_use_timer_override flag, not really this IO-APIC/timer-setup detail that matters. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
