[Bug 210457] Fan sporadically maxed on wake-up due to unavailable sensor temperature

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=210457

cfr (reescf@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |reescf@gmail.com

--- Comment #1 from cfr (reescf@gmail.com) ---
Lenovo ThinkPad X720 is also affected by this, but it is not sporadic, as far
as I can tell. Not once since installing my current kernel have I seen normal
behaviour following sleep.

The problem persists if the machine is rebooted. Only powering off and
restarting restores the expected behaviour.

The bug seems to be a regression. See
https://bugzilla.kernel.org/show_bug.cgi?id=196129. My machine was not affected
by the original bug, but the problem looks to be the same.

Following sleep:

cat /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon7/temp*
0
1000
0
0
0
0
0
cat: /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon7/temp1_input: No such
device or address
cat: /sys/devices/platform/thinkpad_hwmon/hwmon/hwmon7/temp2_input: No such
device or address
0
0
0
0
0
0
0

and

cat /proc/acpi/ibm/thermal 
temperatures:   -128 -128 0 0 0 0 0 0 0 0 1 0 0 0 0 0

Prior to sleep, only the second sensor is missing and acpitz-acpi-0 gives a
sane reading. Following, the first goes AWOL and acpitz-acpi-0 is stuck at 48.

Removing and reloading thinkpad_acpi makes no difference and, for me,
re-sleeping and rewaking makes no difference either.

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