Messages in this thread | | | Date | Sat, 16 May 2009 01:49:30 -0400 (EDT) | From | Len Brown <> | Subject | RE: [PATCH] ACPI: resume: re-enable SCI-enable workaround |
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> >The BIOS bug workaround mistakenly got disabled > >when we followed the ACPI specification more closely > >by ignoring OS updates to that bit. > > Not exactly. ACPICA has always preserved the SCI_EN bit. Linux apparently has a "linux-only" patch to ACPICA that disables this. > > The recent version of ACPICA change the #define enough such that the patch no longer works.
"We" here means Linux, and thus the description is accurate.
The fact is that in 2.6.29 Linux had ACPI_PM1_CONTROL_PRESERVED_BITS 0x0200 and when "we" updated it to 0x201 via the ACPICA update, the workaround in the Linux resume code became a NOP.
-Len
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