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 _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-acpi To unsubscribe, send any mail to "[email protected]"
