Frequent connect / disconnects from systemd-udevd

[hnapel]

Upgraded to ubuntu 20.04, noted that the systemd-udevd was using close to 100% cpu,
then checked with udevadm monitor and noted high frequency of add/ bind / remove /unbind events for the
G513 keyboard like this:

KERNEL[105975.409961] add /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48F5/hidraw/hidraw7 (hidraw)
KERNEL[105975.409985] bind /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48F5 (hid)
KERNEL[105975.410010] bind /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1 (usb)
UDEV [105975.410404] add /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4/input/input74330/event11 (input)
UDEV [105975.411549] bind /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4 (hid)
UDEV [105975.412858] bind /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1 (usb)
UDEV [105975.414204] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4/hidraw/hidraw7 (hidraw)
UDEV [105975.414450] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4/input/input74330/event11 (input)
UDEV [105975.414480] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/usbmisc/hiddev2 (usbmisc)
UDEV [105975.414526] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4/input/input74329/event10 (input)
UDEV [105975.415432] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4/input/input74329 (input)
UDEV [105975.415827] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4/input/input74330 (input)
UDEV [105975.416728] unbind /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4 (hid)
UDEV [105975.417390] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48E4 (hid)
UDEV [105975.418144] unbind /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1 (usb)
KERNEL[105975.497801] remove /devices/pci0000:00/0000:00:1c.4/0000:05:00.0/usb5/5-1/5-1.4/5-1.4.1/5-1.4.1:1.1/0003:046D:C33C.48F5/input/input74397/event10 (input)

This goes on and on with a high rate. After running sudo make uninstall it went away, so I'm quite convinced this program is the issue. Please note I re-installed on the ubuntu 20.0.4 to pull in any updated libs, but the problem remains.

[MatMoul]

How do you have installed g810-led?
On my system I use this file "/etc/udev/rules.d/g810-led.rules"
And I don't use systemd.
What services do you use for g810-led?

[helix26j]

I was experiencing this same issue on my g910 and not having the RUN section at the end of the line in /lib/udev/rules.d/60-g810-led.rules appears to stop it and This was occurring both on system boot but also when using a usb switch. After removing the RUN the keyboard works immediately without having to wait for the disconnect/reconnects to stop.

My profile still applies on system boot (through systemd?). Perhaps its some timing or conflict when the USB device is initializing?

[helix26j]

Cannot seem to edit my previous comment. I am using Linux Mint that is based on Ubuntu 20.04.

[bkw777]

I had the same problem. I was using #267 not the stock version, but it did that same thing. I had to remove the RUN directive from the udev rule.

The command in the RUN section is exiting with an error level of 2.
The same exact command when run from a normal user's terminal session, works fine and exits with 0 not 2.