I have the same problem as satanic666
I have Sony KD-75XF9005, I have turned on enhanced format and I have hdmi_enable_4kp60=1 with a cable that I know supports 4k60Hz (works on a Philips 4k tv I have just fine). I am using HDMI Input 3 as well which on the sony tv has support for enhanced format (HDMI 2 and 3)
How do I view 4K and HDR content (via HDMI) on Sony's 4k Android TV? | Sony UK
I cannot get it to work, Just 30Hz or lower...
Group CEA has 21 modes:
mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive
mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive
mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive
mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive
mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced
mode 6: 720x480 @ 60Hz 4:3, clock:27MHz x2 interlaced
mode 7: 720x480 @ 60Hz 16:9, clock:27MHz x2 interlaced
(prefer) mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive
mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive
mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive
mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive
mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced
mode 21: 720x576 @ 50Hz 4:3, clock:27MHz x2 interlaced
mode 22: 720x576 @ 50Hz 16:9, clock:27MHz x2 interlaced
mode 31: 1920x1080 @ 50Hz 16:9, clock:148MHz progressive
mode 32: 1920x1080 @ 24Hz 16:9, clock:74MHz progressive
mode 34: 1920x1080 @ 30Hz 16:9, clock:74MHz progressive
mode 93: 3840x2160 @ 24Hz 16:9, clock:297MHz progressive
mode 94: 3840x2160 @ 25Hz 16:9, clock:297MHz progressive
mode 95: 3840x2160 @ 30Hz 16:9, clock:297MHz progressive
mode 98: 4096x2160 @ 24Hz unknown AR, clock:297MHz progressive