I have just checked mine and now both are limited to 50%. I suspect that change came in with 20H2 or other update.
David
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First off, the specs are: 13.5"/i7/32GB/512GB/1650 Max-Q
Not sure if this will be the case for all users, but I am currently troubleshooting a issue with the Surface Book 3 going into a thermal throttle state from just restarting or trying to update even basic things.
The first few days were fine - though attempting to run Minecraft didn't actually engage the dGPU for some reason. Eventually got the dGPU to work by installing NVIDIA's GeForce Experience, or whatever it's called.
Then I noticed that the fan would spin up even when the SB3 should have been in sleep mode; I fixed this by just having it hibernate instead. Since then, I haven't heard any fan noise at all, even when the thermals were hitting well into the upper 90s C and even a few cores hitting 100 C.
Now, I can't seem to cool the thing off. I was trying to install Adobe Acrobat Pro and the latest Intel drivers (apparently one was released on 5/20?) the screen shut off and a little thermometer popped up (which I assumed, and later confirmed, meant that it had overheated and shut down to prevent damage).
Like I mentioned just above, now I can't seem to get the darn thing to run cool enough to even install it's routine updates. I have a box fan pointed on it to try and help, but even that doesn't seem to be effective.
When last I checked (which admittedly was a few hours ago now since I'm trying a factory reset to see if one of the updates caused this) the CPU was capped out at 400 MHz, but it hasn't overheated since. It sure does take a heck of a long time to do a reset when your CPU is capped to 400 MHz.
I'm hoping that this factory reset will fix the issue (hey, ya never know 'til ya try, amirite?), but otherwise I assume that I will likely have to warranty this particular SB3.
Not really sure where I was going with all of this, I guess I was wondering if this is something that could be caused by updates and drivers or if there is a more serious hardware issue.
I spent far too long trying to see if I could force the fans to spin regardless before just giving up on that.
I'll add a link here that has a picture (would've done a screen cap, but it's in the middle of resetting) and some video showing what I'm talking about.
Thoughts or suggestions?
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I have just checked mine and now both are limited to 50%. I suspect that change came in with 20H2 or other update.
David
Go into the power settings/ additional power settings/ choose what closing lid does/ and set it to either hibernate or shut down.
I use shut down because I rarely leave open work. Solved the hot problem.
Returning to this thread to report that - as of 2/28/2021 - my overheating issues seem to have abated. I am using the latest drivers for the Surface Book 3 13" and have reset my UEFI settings to charge batteries to their fullest.
I'm glad I did not go through the process of swapping out units. I'm pretty convinced the issue was around driving an external monitor through Surface Dock 2.
Perhaps related - My ethernet port or the Surface Dock 2 would not always come back online when the laptop returned from sleep. This problem seems to be solved also.
Are you still using the external monitor and surface dock?
Yes - single large wide screen curved monitor on USB-C