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Commit b2966b10 authored by Lv Zheng's avatar Lv Zheng Committed by Greg Kroah-Hartman
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ACPI / EC: Drop EC noirq hooks to fix a regression

commit 662591461c4b9a1e3b9b159dbf37648a585ebaae upstream.

According to bug reports, although the busy polling mode can make
noirq stages execute faster, it causes abnormal fan blowing up after
system resume (see the first link below for a video demonstration)
on Lenovo ThinkPad X1 Carbon - the 5th Generation.  The problem can
be fixed by upgrading the EC firmware on that machine.

However, many reporters confirm that the problem can be fixed by
stopping busy polling during suspend/resume and for some of them
upgrading the EC firmware is not an option.

For this reason, drop the noirq stage hooks from the EC driver
to fix the regression.

Fixes: c3a696b6e8f8 (ACPI / EC: Use busy polling mode when GPE is not enabled)
Link: https://youtu.be/9NQ9x-Jm99Q
Link: https://bugzilla.kernel.org/show_bug.cgi?id=196129


Reported-by: default avatarAndreas Lindhe <andreas@lindhe.io>
Tested-by: default avatarGjorgji Jankovski <j.gjorgji@gmail.com>
Tested-by: default avatarDamjan Georgievski <gdamjan@gmail.com>
Tested-by: default avatarFernando Chaves <nanochaves@gmail.com>
Tested-by: default avatarTomislav Ivek <tomislav.ivek@gmail.com>
Tested-by: default avatarDenis P. <theoriginal.skullburner@gmail.com>
Signed-off-by: default avatarLv Zheng <lv.zheng@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent ec469b5e
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