This might be a silly question for a Windows noob, but
@LindsayD how did you know to do all of that?
I suppose like most people, I've had to learn to fix things over the years as a result of having hot or noisy laptops. Hours spent on the internet, YouTube videos and trial and error. I'm nowhere near as knowledgeable as many of the contributors here though!
With respect to the Aero I'm using to type this, I have a few more observations to add:
Sometimes it throttles even at apparent idle (XTU's Current Limit Throttle goes yellow) and I can only presume that is due to my chosen power settings. This is irrespective of whether on battery or charger.
The fans rarely spin up but when they do the sound isn't loud but it is high pitched, slightly buzzy, and a bit metallic. The lowest fan setting is the most annoying. Research has shown that this appears to be normal for this particular machine.
For Adobe Lightroom users, I find the fans spin up pretty much every time I go to a new image and fiddle with something or when scrolling through images in the Develop module. It's irrespective of whether using the GPU is selected in Preferences or not (the RTX2070 is selected by default). However if I force LR to use the UHD 630 instead, the fans hardly come on. Likewise if I then deselect the UHD 630 in LR Preferences. In other words so long as I have the UHD 630 showing as the one I've assigned to LR, whether it's off or on (LR is much slower with the UHD 630 'on') then the fans are less active.
Each time I switch the computer on, or plug in or remove the charger, the system defaults to a Performance power plan and I have to manually re-set it to balanced.
As was the case with my X1E, performance is noticeably slower in 4K, particularly when rendering images in Lightroom, using the adjustment brush etc. I tend to switch to 1080p for editing and retouching for that reason, it significantly speeds things up. This is just a 4k phenomenon - it's nice to be able to switch between the two resolutions when the situation dictates it.