After not using your laptop all summer, the battery drains completely every night when shutting the lid. This used to work fine.
How to Investigate
Run a sleep study. From an elevated command prompt:
C:\WINDOWS\system32>powercfg /SLEEPSTUDY Sleep Study report saved to file path C:\WINDOWS\system32\sleepstudy-report.html.
Open the generated HTML file. Mine had a graph looking like this:
Scroll down and try and find the section that has the worst drain:
Click on that row of the table. Find the red box and drill down until you find a culprit
The problem, in my case
The Realtek card reader has a driver that doesn’t play nice with Windows 10. You’d think that, being a Surface Book, I wouldn’t have problems like this, or they’d expedite a fixed driver, or pull the bad one.
I rolled back to an older version of the driver, provided by Microsoft.
At least the sleep study tool is pretty good!