Had the same problem on Dell Latitude E6400 laptop using Gentoo Linux with udev versions newer than udev-233. Disabling Bluetooth in BIOS solved the issue, however, I need bluetooth. Researching the web resulted in this page:
https://askubuntu.com/questions/1028883/ubuntu-18-04-systemd-udevd-uses- high-cpu-conflict-with-wifi 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). Best regards Florian -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1759836 Title: systemd-udevd consumes 100% of CPU To manage notifications about this bug go to: https://bugs.launchpad.net/kernel/+bug/1759836/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
