I have the same issue. I'm using Dell Latitude 7280 connecting to Dell universal dock D6000, with two Dell monitors. The OS is Ubuntu 16.04.3 with kernel 4.10.0-35. The CPU goes very high and stays around 30% when idle. When resuming from sleep it keeps 100+% and don't go down even when idle.
I have the same issue. I'm using Dell Latitude 7280 connecting to Dell universal dock D6000, with two Dell monitors. The OS is Ubuntu 16.04.3 with kernel 4.10.0-35. The CPU goes very high and stays around 30% when idle. When resuming from sleep it keeps 100+% and don't go down even when idle.