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Date: Thu, 9 Dec 2010 22:51:42 +0000 From: Matthew Garrett <mjg59@...f.ucam.org> To: "H. Peter Anvin" <hpa@...or.com> Cc: x86@...nel.org, linux-acpi@...r.kernel.org, lenb@...nel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 1/3] X86: Revamp reboot behaviour to match Windows more closely On Thu, Dec 09, 2010 at 02:40:15PM -0800, H. Peter Anvin wrote: > On 12/09/2010 02:38 PM, Matthew Garrett wrote: >>> 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. I'm afraid I don't understand your argument. The date cutoff would be on the order of 2001 (anything after this will have been tested with XP). The spec that defines this behaviour only came into existence in August 2000, and any older hardware will be missing the flag that indicates that this feature is supported. It doesn't seem realistic to believe that there's any real body of hardware that sets the flag but otherwise has a broken implementation. -- Matthew Garrett | mjg59@...f.ucam.org -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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