I have carried out some more comprehensive tests using the kernel in #4 over
the weekend and found it does improve my situation far more than my initial
quick test showed. Most of the rather bizarre behaviour has gone include the
changes with power from battery to external and the importance of suspending.
Once kworker spinning has started it can now be _predictably_ stopped when
using your kernel by:
Any USB 2 device being plugged into any USB port or a USB 3 device plugged
into the USB 2 port
The internal Bluetooth being turned on so that it shows up as USB device
The internal Web cam being used (by cheese during my test).
Note running the web cam does not change what is shown by lsusb -t, everything
else which stops spinning shows as a new device being connected in dmesg and
appears in lsusb.
Although the kernel in #4 does not completely solve the problem it is obviously
addresses the correct area and in my case makes the machine usable without
having anything plugged into a usb port, keeping bluetooth on is sufficient.
@AceLan What is the status of the patch and other work on the issue? Is
there anything else I can do to progress the work?
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https://bugs.launchpad.net/bugs/1488426
Title:
High CPU usage of kworker/ksoftirqd
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Bug description:
kworker consuming 71.5% cpu resource
ksoftirqd consuming 28.9% cpu resource
It leads to power consumption issue and sometimes leads to BT does not
work.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1488426/+subscriptions
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