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Microsoft finally fixes the NVIDIA dGPU and BD PROCHOT-related CPU throttling issues that have been affecting some Surface Book 2 devices for months

Some Surface Book 2 laptops have been plagued with disconnecting dGPU and CPU throttling issues for months. (Image source: Engadget)
Some Surface Book 2 laptops have been plagued with disconnecting dGPU and CPU throttling issues for months. (Image source: Engadget)
The Surface Book 2 and Surface Book 2 15 may be innovative devices, but they have suffered from two critical problems in recent months. Microsoft now claims to have fixed the NVIDIA dGPU disconnects and BD PROCHOT-related throttling issues that have affected some machines since at least the summer. The fixes should prompt the re-release of Windows 10 version 1903 for the Surface Book 2 series too.

The Surface Book 2 impressed us during our time with it almost two years ago, especially considering that Microsoft had managed to fit a quad-core Core i7 processor within such a small form factor. We were fans of the Surface Book 2 15 too, despite receiving a defective unit.

However, more recently the series has been plagued with crippling issues, as Microsoft acknowledged earlier this year. Specifically, Windows 10 version 1903 has been causing many Surface Book 2 devices to experience NVIDIA dGPU disconnects, forcing those affected to remain on older versions of Windows. Moreover, a separate BD PROCHOT issue has resulted in the CPUs of some devices erroneously downclocking to 400 MHz, on which we reported in July.

Thankfully, it now seems that Microsoft has resolved both issues. The company has released two firmware updates that address these issues separately, which you can download manually from here if they do not appear on Windows Update. Each download is over 0.5 GB, for reference. You can see whether your laptop is already running these fixes by heading to Device Manager and checking which versions of Surface System Aggregator and Surface UEFI it is running. If Device Manager reports 182.1004.139.0 for the former and 389.2837.768.0 for the latter, then your Surface Book 2 should be all set.

Incidentally, Microsoft has also released a Surface Base 2 firmware update that it claims "improves battery stability". The update carries the driver version number 1.75.139.0.

The Surface Book 2 and Surface Book 2 15 should have now started receiving Windows 10 version 1903 again too. Let us know in the comments if your Surface Book 2 has been upgraded to version 1903 and your experiences of these new firmware updates. (buy Surface Book 2 13, Core i5 now at Amazon)

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> Notebook / Laptop Reviews and News > News > News Archive > Newsarchive 2019 10 > Microsoft finally fixes the NVIDIA dGPU and BD PROCHOT-related CPU throttling issues that have been affecting some Surface Book 2 devices for months
Alex Alderson, 2019-10-16 (Update: 2019-10-16)
Alex Alderson
Alex Alderson - News Editor - @aldersonaj
Prior to writing and translating for Notebookcheck, I worked for various companies including Apple and Neowin. I have a BA in International History and Politics from the University of Leeds, which I have since converted to a Law Degree. Happy to chat on Twitter or Notebookchat.