Tested the x86_64 image with my Intel NUC D54250WYK and an Original Sony PS3 Controller (Sixaxis Model CECHZC1E).
Installed the image with Etcher on a new/fresh USB 3.0 64GB USB Stick (Sandisk).
Result:
No Sound/Music in EmulationStation Main Menu and the default (out-of-the-box) Controller Mapping is messed up.
By testing/try and error i found out that:
L1 = Up
L2 = Down
Square = Start
Down = Select (SNES B Button)
Went to "Controller Settings", "Configure A Controller" and did the mapping (but within mapping, "L3" was immediately skipped, so i was not able to map L3-Button correctly by pressing the left Thumb-Stick of my PS3-Controller, but all other buttons i was able to map correctly)
Then started SNES Game Classic Kong, but no sound/music and no control possible, no button works (even Hotkey + Start to exit also does not work)
With another PC i started a browser and went to "Recalbox Manager", "Support" and did launch the recalbox-support.sh:
Download URL: https://file.ac/iPisUJahqEE/
Did a reboot through Recalbox Manager, then went to "Sound Settings", "Output Device" and i could choose between:
[0:3] HDA-INTEL - HDA INTEL HDMI + HDMI
[0:7] HDA-INTEL - HDA INTEL HDMI + HDMI
[0:8] HDA-INTEL - HDA INTEL HDMI + HDMI
[0:9] HDA-INTEL - HDA INTEL HDMI + HDMI
[1:0] HDA-INTEL - HDA INTEL PCH + ALC283
I selected the first one and then music in Emulation Station Menu worked.
Then started SNES Classic Kong again. Sound now works, but still no controls possible (had to reboot again through recalbox manager).
After reboot i started Kodi and in Kodi control and sound works
Then tested other Systems (Gameboy, NES) and no control possible
So control in Kodi works but not in Emulators.