I’d check the AMD software to make sure that it is still preferring high performance and maximum power consumption. New drivers often seem to reset that.
Also, the intel drivers are old, and so getting current from intel itself may help.
- Driver Date/Size: 2018-02-27 5:00:00 PM, 1930416 bytes
Sometimes switchable graphics need the integrated updates as that’s what tells it when to turn on or off.