The driver rollback is grayed out (unavailable) for devices in the Device Manager. From what I find doing a search, the user must be an "Administrator" or it will be unavailable. My account is an Administrator account.
What do I have to change to fix this?
I guess, there must another driver installed previously to roll-back to. If you have upgraded to TH2, default drivers are basic, no previous version, unless you choose to via: Update driver - Browse - Let me pick ... .
Yeah, I just logged in to report that. Since upgrading to the 1511 version no driver rollbacks are available.
I manually updated my Realtek sound driver using the driver from the Realtek site. It now shows as a driver rollback is available.
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