Patchwork [2/2] ACPI: EC: Revert "ACPI / EC: Enable event freeze mode..." to fix a regression

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Submitter Lv Zheng
Date July 12, 2017, 3:09 a.m.
Message ID <>
Download mbox | patch
Permalink /patch/9835823/
State Awaiting Upstream
Delegated to: Rafael Wysocki
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Lv Zheng - July 12, 2017, 3:09 a.m.
On Lenovo ThinkPad X1 Carbon - the 5th Generation, enabling an earlier EC
event freezing timing causes acpitz-virtual-0 to report a stucked 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 (see comment 168 on link #1).

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")
Link: [#1]
Tested-by: Damjan Georgievski <>
Signed-off-by: Lv Zheng <>
Cc: Stable <> # 4.9+
 drivers/acpi/ec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c
index 05e4eb5..ddb01e9 100644
--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -147,7 +147,7 @@  static unsigned int ec_storm_threshold  __read_mostly = 8;
 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");