A client is having some trouble with a new Lenovo ultrabook, docked on a new, genuine Lenovo docking station which came with it. When docked with printer/ I/O peripherals attached, all works beautifully for an indefinite period of time (tested over a 12+ hour stretch without incident). However, when a Samsung TV/ monitor is attached via HDMI as an extra screen, the Lenovo's cooling fan seems to kick into high gear within a minute, whirring loudly for a time every 5 minutes or so. If this monitor is removed, all goes back to normal quickly. If another LG monitor is connected via D-SUB, similar symptoms occur, but after about 30 minutes and the whirring happens less frequently than every 5 minutes. The same reduction in fan speed and subsequent noise can be seen after monitor B is removed.
When the fan speed increases, the PC's performance reduces, possibly indicating some tie-in to CPU overheating or the like.
The same symptoms, to a lesser extent, can also be seen when the ultrabook has been removed from the dock, but still with either monitor attached.
The client is not a heavy user by any stretch, and a CrashPlan cloud backup operating almost constantly in the background. They pretty well only use Office 365, primarily Word & Outlook. There are no other programs to speak of which should put any real strain on the working of the PC, causing it to heat up and call the fan into overdrive.
Looking forward to hearing you collective thoughts so that we can get to the bottom of this!