No luck. I have been trying to debug it but couldn’t figure out anything. It certainly happens more often when connected to the AC (i am using the original 65w adapter), but I feel that sometimes it also happens when on battery.
I have yet to try to boot into a live usb image and see if the problem persists.
On a side note, I just found this post on the lenovo forum related to a bugged touchpad firmware released on june/july this year. The post doesn’t say anything about lagging touchpad, but mentions another problem that I had sometime ago and don’t know if it’s related. I am trying to check what version of the firmware I have installed, because I definitely had that problem but it hasn’t happened in a while.
They also just released a new firmware (fixing the above issue) but say it has only been tested on windows and may take a while until it arrives to linux.
This doesn’t apply to David (op), for what it seems the issue affects synaptic touchpads but AFAIK the T14 Gen 3 comes with elan touchpad.