Messages in this thread | | | Date | Thu, 09 Dec 2010 14:40:15 -0800 | From | "H. Peter Anvin" <> | Subject | 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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