ACPI / EC: Use ec_no_wakeup on Thinkpad X1 Carbon 6th (8195a655) · Commits · e / devices / android_kernel_fairphone_FP4

On this system EC interrupt triggers constantly kicking devices out of low power states and thus blocking power management. The system also has a PCIe root port hosting Alpine Ridge Thunderbolt controller and it never gets a chance to go to D3cold because of this. Since the power button works the same regardless if EC interrupt is enabled or not during s2idle, add a quirk for this machine that sets ec_no_wakeup=true preventing spurious wakeups. Signed-off-by:

Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by:

Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/acpi/ec.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -2037,6 +2037,17 @@ static inline void acpi_ec_query_exit(void)
		}
		}

		static const struct dmi_system_id acpi_ec_no_wakeup[] = {
		{
		.ident = "Thinkpad X1 Carbon 6th",
		.matches = {
		DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
		DMI_MATCH(DMI_PRODUCT_NAME, "20KGS3JF01"),
		},
		},
		{ },
		};

		int __init acpi_ec_init(void)
		{
		int result;
		@@ -2047,6 +2058,15 @@ int __init acpi_ec_init(void)
		if (result)
		return result;

		/*
		* Disable EC wakeup on following systems to prevent periodic
		* wakeup from EC GPE.
		*/
		if (dmi_check_system(acpi_ec_no_wakeup)) {
		ec_no_wakeup = true;
		pr_debug("Disabling EC wakeup on suspend-to-idle\n");
		}

		/* Drivers must be started after acpi_ec_query_init() */
		dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver);
		/*