A week ago we posted on a firmware update for the Surface Pro (Model 1796) and Surface Pro with LTE Advanced (Model 1807) devices running Windows 10 Fall Creators Update and above that was meant to address pen and touch performance.
It turns out the update addressed a serious issue which has been troubling Surface users for some time now.
When writing on the screen of the tablet with your hand resting on the screen, as in the image above, many users were finding that their digital ink was offset from where the pen tip was. This issue was not present when your hand was not resting on the screen.
The issue can be seen demonstrated below:
VIDEO Writing in the Surface support forums a Microsoft representative said the issue was now resolved, saying:
As of 8/8, the fix to address this issue has completed testing and is now live, please go update your Surface Pro via Windows Update to get the latest download. You can obtain this fix by checking
Settings >
Update & Security >
Windows Update According to the Surface Pro Update History website, this latest set of firmware updates impacts all 2017 Surface Pros (models 1796 and 1807) running Windows 10 version 1703 or newer. The fixes address the holy trinity of security, reliability, and performance, and include:
• Marvell AVASTAR Bluetooth Radio Adapter – Bluetooth 15.68.9125.57 improves system security.
• Marvell AVASTAR Wireless-AC Network Controller – Network adapter 15.68.9125.57 improves system security.
• Surface Integration Service Device – System devices 4.18.136.0 improves system stability.
• Surface Touch Servicing ML – System devices 1.16.139.0 improves pen and touch performance.
• Surface Touch – Firmware 429.0.1.10 improves pen and touch performance.
• Surface UEFI – Firmware 234.2291.769.0 improves driver installation servicing.
source 
