I fix the problem with this approach:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1759836/comments/70
from "Florian Dittmer (fd81)"
"
Following the instructions mentioned by one user in the comments helped me to
solve the cpu load issue with udev-239 and kernel 4.18.17, while Bluetooth
still works.
Run the following command:
/lib/systemd/systemd-udevd -D
This should print garbage in endless loop containing
".../97-hid2hci.rules:"
If so, edit /lib/udev/rules.d/97-hid2hci.rules
and add
ACTION=="add",
in front of line mentioned by above command.
In my case, I had to change the following lines in 97-hid2hci.rules
from:
ATTR{bInterfaceClass}=="03", ATTR{bInterfaceSubClass}=="01",
ATTR{bInterfaceProtocol}=="02", \
ATTRS{bDeviceClass}=="00", ATTRS{idVendor}=="413c",
ATTRS{bmAttributes}=="e0", \
RUN+="hid2hci --method=dell --devpath=%p", ENV{HID2HCI_SWITCH}="1"
to:
ACTION=="add", ATTR{bInterfaceClass}=="03", ATTR{bInterfaceSubClass}=="01",
ATTR{bInterfaceProtocol}=="02", \
ATTRS{bDeviceClass}=="00", ATTRS{idVendor}=="413c",
ATTRS{bmAttributes}=="e0", \
RUN+="hid2hci --method=dell --devpath=%p", ENV{HID2HCI_SWITCH}="1"
And this fixed the issue (after reboot).
"
from
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https://bugs.launchpad.net/bugs/1759836
Title:
systemd-udevd consumes 100% of CPU
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