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SubjectRe: acpi_idle: Very idle Core i7 machine never enters C3
What do you see if you apply just the patch below?

Also, in addition to "powertop -d" to show what the kernel requests,
please run turbostat to show what the hardware actually did:

# turbostat -d -v sleep 5

-Len Brown, Intel Open Source Technology Center
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 7c0441f..f528625 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -763,7 +763,7 @@ static const struct file_operations acpi_processor_power_fops = {
static int acpi_idle_bm_check(void)
u32 bm_status = 0;
+return bm_status;
acpi_read_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, &bm_status);
if (bm_status)
acpi_write_bit_register(ACPI_BITREG_BUS_MASTER_STATUS, 1);

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