Date: Sun, 08 Jul 2012 12:11:32 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: "freebsd-acpi@freebsd.org" <freebsd-acpi@FreeBSD.org> Subject: disabled CST_CNT write Message-ID: <4FF94EC4.1060109@FreeBSD.org>
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acpi_cpu.c has a block of code to write CST_CNT to SMI_CMD, but the block is under #ifdef notyet. It seems that the code was added that many years ago and never enabled. Now, judging from the reports I've seen on this mailing list, it appears that _CST changes do happen and the driver seem to handle them sufficiently well. I think that a lot of modern platforms do not even provide CST_CNT and assume that an OS is able to handle C-state change notifications. So, I guess that it should be safe to enable the code in question now. Could anyone with a FreeBSD laptop and non-zero CST_CNT in FADT please test this? Thank you. -- Andriy Gapon
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