Tiredsome In my case I still get 64hz refresh rate with Basic driver (I do not use my laptop for gaming so I do not care much about the fps). I can still use Office, watch videos... normally. The thing is, while the 64hz refresh rate is still good, the Basic driver feels sluggish in comparison to the UHD driver, some stutters can be seen while playing videos but still usable to me.
I think you can go to the Display settings and see if you can increase the refresh rate there?