Mouse and Keyboard (over KVM switch) stopped working after Upgrade to Ubuntu 20.04 LTS

I use Ubuntu over a Manhattan KVM switch (8-port HDMI) that worked perfectly with Ubuntu 18.04. I performed an update from 18.04 to 20.04 and my mouse and keyboard (connected over the KVM switch) stopped working.

I tried to reproduce the issue with another system and got the same: not-working keyboard and mouse.

lsusb shows the KVM-switch as Logitech Unifying Receiver.

Do I need to load a specific kernel module?

Currently logitech-djreceiver is loaded according the dmesg output. I did attach another mouse and keyboard. These make use of hid-generic and work. Did anyone face a similar situation? Are there any ideas for solving the issue?

Solution 1:

If removing the kernel module fixes the issue, why not just blacklist the entire module from loading at boot?

$ sudo su
# echo "blacklist hid_logitech_dj" >> /etc/modprobe.d/blacklist.conf
# update-initramfs -u

Then reboot, and it shouldn't load the module any further while booting.