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https://bugs.launchpad.net/bugs/1711951
Title:
CPU fan goes full throttle triggered by waking up from suspend on
Lenovo X1 Carbon (4th Gen., 2016)
Status in linux package in Ubuntu:
Incomplete
Bug description:
This is a copy of a very similar bug report which is currently marked
as triaged and where my comment is ignored maybe because of that.
Please see my additional remarks at the end of this report.
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Thinkpad X1 Carbon 5th generation ultrabook with i7 Kabylake CPU running
Ubuntu 17.04 has its fan go full steam if the laptop is woken up from
sleep/suspend. Without any sleep/suspend the laptop's fan is basically "off" or
silent, even for hours.
The bug has been fixed upstream, see
6625914 ACPI / EC: Drop EC noirq hooks to fix a regression
9c40f95 Revert "ACPI / EC: Enable event freeze mode..." to fix a regression
and/or https://bugzilla.kernel.org/show_bug.cgi?id=196129
(with duplicate https://bugzilla.kernel.org/show_bug.cgi?id=191181)
and I hope this fix will make its way into a near-future kernel update
to ubuntu :)
Many thanks!
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Source: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1709616
Additional remarks:
- Like mentioned in https://bugzilla.kernel.org/show_bug.cgi?id=191181, the
bug happens in other Lenovo models as well. It's not limited to the X1 Carbon
5th Gen.
- The bug was fixed in kernel 4.13 but not in 4.10. This means that users who
run the HWE kernel on Ubuntu 16.04 LTS will have this problem too!
I can reproduce it on my local system which has "linux-image-generic-
hwe-16.04" installed (4.10.0.32.34).
Reading through the comments, it's not exactly clear to me which of
the commits has fixed this problem, but I guess that the following two
changes have made the difference:
https://patchwork.kernel.org/patch/9835823/
https://patchwork.kernel.org/patch/9835825/
I am reporting this as a new issue because the fixes from 4.13 need to
be backported to 4.10 for users of the Ubuntu 16.04 HWE kernel.
Many thanks!
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