Comment 15 for bug 1987829

I've also noticed high CPU usage on an LG Gram 17Z90Q, with a Core i7-1260P CPU, when plugging in the USB-C charger.

I checked on the CPU usage using `top`. If I unplug the charger, the kworker processes causing the CPU usage disappear within about 2 seconds, and about 10 seconds later the system will have cooled enough for the fan to start spinning down. If I plug the charger back in, the kworker processes reappear almost instantly, and about 15 seconds later the fan starts to spin up again. For me, the kworker processes and fan noise remain even when the battery is at 100% charge, so long as it remains plugged in.

A few of the kworker process commands taking up the most CPU (when plugged in):
kworker/u32:15+USBC000:00-con0
kworker/0:1+kacpi_notify
kworker/u32:2-events_power_efficient
kworker/0:0-events
kworker/1:2+kec_query
kworker/0:3-events
kworker/15:2-events

The system runs fine on battery, remaining cool and quiet.