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Subject[PATCH 4.12 133/196] Revert "ACPI / EC: Enable event freeze mode..." to fix a regression
4.12-stable review patch.  If anyone has any objections, please let me know.


From: Lv Zheng <>

commit 9c40f956ce9b331493347d1b3cb7e384f7dc0581 upstream.

On Lenovo ThinkPad X1 Carbon - the 5th Generation, enabling an earlier
EC event freezing timing causes acpitz-virtual-0 to report a stuck
48C temparature. And with EC firmware revisioned as 1.14, without
reverting back to old EC event freezing timing, the fan still blows
up after a system resume.

This reverts the culprit change so that the regression can be fixed
without upgrading the EC firmware.

Fixes: d30283057ecd (ACPI / EC: Enable event freeze mode to improve event handling)
Tested-by: Damjan Georgievski <>
Signed-off-by: Lv Zheng <>
Signed-off-by: Rafael J. Wysocki <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/acpi/ec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -147,7 +147,7 @@ static unsigned int ec_storm_threshold
module_param(ec_storm_threshold, uint, 0644);
MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm");

-static bool ec_freeze_events __read_mostly = true;
+static bool ec_freeze_events __read_mostly = false;
module_param(ec_freeze_events, bool, 0644);
MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume");

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