Yes, I've had problems with HDMI too. I get a blue screen and VIDEO_TDR_FAILURE error. I suspect the 15.7.1 drivers are not HDCP compliant.
I ended up switching back to the previous drivers that worked in win8.1.
I used this tool from microsoft KB3073930 to block the driver updates
I uninstalled both amd and intel drivers (with vga attached) in Device Manager
Installed Previous Intel Driver
Extracted Previous AMD Driver
Right Click 'Scan for Changes' which brought up the 'Microsoft General Display Driver' (or similar title)
Right Click 'Update Driver' and chose the extracted AMD folder
HDMI Now Working.
1 - Open Device Manager. Right click in the Start Menu Button (The windows logo in the bottom left of the screen, YES you can right click it in Windows 10), and select Device manager.
2 - Find the Graphics Drivers
3 - Right click in the Graphic Driver (If your laptop has an integrated card you have to right click that one) and select Update driver
4 - Select the bottom option, for Search drivers in your PC
5 - Select the bottom option again, for Search from a list
6 - Select a different version from the one you already have. If you have an integrated card, you need to select the older versions.
7 - Click Next, wait for it to update the drivers, the sceen will flicker for a while.
8 - Restart your PC, if it doesnt help, please post a picture of how the Device Manager window looks in your PC so we can see what you have in the laptop.
For some reason this happened in my laptop, where Windows installed the drivers from the discrete card into the integrated card (main card). Then I had no options to set screen resolutions or connect other screens via HDMI or VGA. After changing the driver from the integrated card to a lower version (which windows provided via Windows Update) everything works fine, connecting screens and all.