Re: [PATCH 1/3] X86: Revamp reboot behaviour to match Windows more closely

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On 12/09/2010 02:38 PM, Matthew Garrett wrote:
On Thu, Dec 09, 2010 at 02:32:52PM -0800, H. Peter Anvin wrote:
On 12/09/2010 02:32 PM, Matthew Garrett wrote:
On Thu, Dec 09, 2010 at 02:25:05PM -0800, H. Peter Anvin wrote:
When this was discussed before we agreed to use ACPI reboot by default
with an ACPI cutoff date; this doesn't have any such cutoff.

Windows doesn't either. Older machines simply won't have the appropriate
flag set in their FADT.


Windows doesn't get validated on old hardware.

XP does this, and older hardware predates the version of the ACPI spec
that introduced this flag.


ACPI is very buggy on early implementations, presumably because WHQL had not yet been extended to include it. That is exactly why we combine these kinds of things with a date check.

	-hpa

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