What does CTRL+WIN+SHIFT+B do in Windows?

I'm using Windows 10 and today I accidentally hit the key combination: Ctrl+Shift+Win+B.

As a result, the screens went black for about a second and I heard a beep.

This is reproduceable; every time I hit the aforementioned key combination, the same behavior occurs.

Searching on the web I could find nothing about this except a reddit thread in which a user said he observed a similar behavior in Windows 8 by pressing Ctrl+Win+B (no Shift).

So, what is this key combination used for?

Solution 1:

The Ctrl+Shift+Win+B key sequence will restart your graphics driver.

Solution 2:

Official from Microsoft: "Windows logo key + Ctrl + Shift + B = Wake PC from blank or black screen"

From a discussion with an AMD Radeon driver engineer, it does NOT restart the graphics driver. It does appear to discard the desktop surface buffer and re-create the allocation from DWM (on a healthy system the desktop goes black for a second).

Solution 3:

Have only found this one, please take a look:

Ctrl+Win+B -> Switch to the program that displayed a message in the notification area.