Hi again:  So, I tried both with restored default bios settings and
default factory setting.  The kworker process is still going at over
85%.  I can turn it off w/ echo "disable" >
/sys/firmware/acpi/interrupts/gpe6F in both cases.

One odd thing I noticed.  With the default settings, I have two devices
I can boot from, one is ubuntu and the other is UEFI.  If I try to boot
from UEFI, I get an error message saying it can't start (can't find boot
order?) and that it is changing the settings.  When I look in the BIOS
after this, the setting change I see is that ubuntu is now first in boot
order.  It boots fine after that.

I also tried running the system with Secure Boot, after erasing
virtualbox.  This also has no effect on the kworker process.  And, when
I reinstalled VirtualBox, it gave me the option to create a MOK key and
put it in place, which I did.  System now starts with Secure Boot and
VirtualBox on it (yay, progress!).  kworker process continues to fire up
at 85%+.

Given that the out of control kworker process seems to be called by
kthreadd, the 2nd process after system init (process 1), I'm guessing
that it isn't something in the software on my system that is causing the
issue.  Maybe it's the specific hardware I have.  Do you have a lshw?

Peter

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https://bugs.launchpad.net/bugs/1799235

Title:
  kworker process starts at 85% of cpu and stays there

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