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Microsoft aware of severe throttling issue affecting Surface Pro 6 and Surface Book 2 that leaves devices locked at just 400 MHz

Microsoft's Surface Pro 6 and Surface Book 2 devices are suffering from severe CPU throttling. (Source: Microsoft)
Microsoft's Surface Pro 6 and Surface Book 2 devices are suffering from severe CPU throttling. (Source: Microsoft)
Microsoft’s Surface Pro 6 and Surface Book 2 models are suffering from severe throttling problems. The company is said to be aware of the issue and is preparing a firmware update to address the problem.
Sanjiv Sathiah,
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CPU throttling issues aren’t new but it doesn’t make them any less annoying when trouble strikes. As noted in a Reddit thread, Microsoft Surface Pro 6 and Surface Book 2 users are extremely frustrated with their devices experiencing the problem. It is similar to an issue plaguing Surface Pro devices, including this new generation, that Notebookcheck identified back in October; however, if anything, it seems to be getting worse. According to user reports, the Kaby Lake-R-based Intel CPUs in both devices are throttling down to as low as 400 MHz and locking at this frequency.

Users have tracked the problem down to a Windows alert used by components peripheral to the CPU called BD PROCHOT that results in the CPU throttling down to protect it and any other internal components from overheating and suffering damage as a result. Some have been able to workaround the issue by removing their devices from docks or connected AC adapters. Others haven’t, however, had any luck even when rebooting their Surface.

In a message sent to TechRepublic about the matter, Microsoft said “We are aware of some customers reporting a scenario with their Surface Books were CPU speeds are slowed [and] are quickly working to address via a firmware update.” At this stage, however, there is no firm time frame on when the patch will arrive leaving users with devices that are performing well below specification. While some throttling can be expected in thermally constrained devices such as these, the speeds being logged are well below anything that could be described as normal.

(Source: Reddit)
(Source: Reddit)
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Sanjiv Sathiah
Sanjiv Sathiah - Senior Tech Writer - 1258 articles published on Notebookcheck since 2017
I have been writing about consumer technology over the past ten years, previously with the former MacNN and Electronista, and now Notebookcheck since 2017. My first computer was an Apple ][c and this sparked a passion for Apple, but also technology in general. In the past decade, I’ve become increasingly platform agnostic and love to get my hands on and explore as much technology as I can get my hand on. Whether it is Windows, Mac, iOS, Android, Linux, Nintendo, Xbox, or PlayStation, each has plenty to offer and has given me great joy exploring them all. I was drawn to writing about tech because I love learning about the latest devices and also sharing whatever insights my experience can bring to the site and its readership.
contact me via: @t3mporarybl1p
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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2019 08 > Microsoft aware of severe throttling issue affecting Surface Pro 6 and Surface Book 2 that leaves devices locked at just 400 MHz
Sanjiv Sathiah, 2019-08-16 (Update: 2019-08-17)