According to the changelog the firmware update was released on October 11, and both Surface devices get specific system and Intel driver updates to improve camera stability. Here’s the list with drivers that have been updated for Surface Pro 4 and Surface Book.

Surface Pro 4 firmware released on October 11, 2017 

Surface Embedded Controller Firmware – Firmware: 103.1791.258.0 Improves device reliability. Intel AVStream Camera 2500 – Sound, video and GC: 30.15063.10999.4731 Improves camera stability. Microsoft Camera Front – System device: 30.15063.10999.4731 Improves camera stability. Microsoft Camera IR Front – System device: 30.15063.10999.4731 Improves camera stability. Intel Control Logic – System device: 30.15063.10999.4731 Improves camera stability. Intel CSI2 Host Controller – System device: 30.15063.10999.4731 Improves camera stability. Intel Imaging Signal Processor 2500 – System device: 30.15063.10999.4731 Improves camera stability. Microsoft Camera Rear – System device: 30.15063.10999.4731 Improves camera stability. Surface Camera Windows Hello – System device: 1.0.85.1 Improves camera stability. Surface Integration – System device: 1.0.170.0 Improves device reliability.

Surface Book firmware released on October 11, 2017

Intel AVStream Camera 2500 – Sound, video and GC: 30.15063.10999.4731 Improves camera stability. Microsoft Camera Front – System device: 30.15063.10999.4731 Improves camera stability. Microsoft Camera IR Front – System device: 30.15063.10999.4731 Improves camera stability. Intel Control Logic – System device: 30.15063.10999.4731 Improves camera stability. Intel CSI2 Host Controller – System device: 30.15063.10999.4731 Improves camera stability. Intel Imaging Signal Processor 2500 – System device: 30.15063.10999.4731 Improves camera stability. Microsoft Camera Rear – System device: 30.15063.10999.4731 Improves camera stability. Surface Camera Windows Hello – System device: 1.0.85.1 Improves camera stability.

The new October 2017 firmware update for Surface Pro 4 and Surface Book should download and install automatically. However, if you have not received the update on your Surface, then go to Settings > Update & security > Windows Update and try to force the download manually.

Surface Pro 4 | See at Microsoft Surface Book | See at Microsoft

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