On Thu, 2008-05-15 at 18:35 -0700, Eric W. Biederman wrote:
quoted text
> Vivek Goyal <vgoyal@redhat.com> writes:
> 
> > ioapic_suspend() is not putting APICs in Legacy mode and that's why
> > we are seeing the issue. It only saves the IOAPIC routing table entries
> > and these entries are restored during ioapic_resume().
> >
> > But I think somebody has to put APICs in legacy mode for normal 
> > hibernation also. Not sure who does it. May be BIOS, so that during
> > resume, second kernel can get the timer interrupts.
> 
> I doubt anything cares in the suspend to ram case. There should just
> be a small BIOS trampoline to get back to linux when the processor
> restarts.  And you don't need interrupts for any of that. 

As far as I know, in suspend to ram, interrupt is used as waking up
event, such as, keyboard interrupt.

Best Regards,
Huang Ying
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