Patch "Revert "ACPI / EC: Enable event freeze mode..." to fix a regression" has been added to the 4.9-stable tree

Patch "Revert "ACPI / EC: Enable event freeze mode..." to fix a regression" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    Revert "ACPI / EC: Enable event freeze mode..." to fix a regression

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     revert-acpi-ec-enable-event-freeze-mode...-to-fix-a-regression.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9c40f956ce9b331493347d1b3cb7e384f7dc0581 Mon Sep 17 00:00:00 2001
From: Lv Zheng <lv.zheng@intel.com>
Date: Wed, 12 Jul 2017 11:09:17 +0800
Subject: Revert "ACPI / EC: Enable event freeze mode..." to fix a regression

From: Lv Zheng <lv.zheng@intel.com>

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)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=191181#c168
Tested-by: Damjan Georgievski <gdamjan@gmail.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 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");
 


Patches currently in stable-queue which might be from lv.zheng@intel.com are

queue-4.9/revert-acpi-ec-enable-event-freeze-mode...-to-fix-a-regression.patch
queue-4.9/acpi-ec-drop-ec-noirq-hooks-to-fix-a-regression.patch