Originally Posted by nurps
For me its not even switching to 1080p when I select it in the service menu. It says reconnect but then again its set to 720p. Xperia Z and Z2 only outputing 720p. Are they even capable of 1080p MHL?
Is it possible the MHL cable is just crap?
The Z Ultra has MHL 1.0 or most likely 2.0 since 2.0 requires 900mA and therefore an external power source is needed (which my cable has) while 1.0 only requires 500mA, which is provided through a regular USB/HDMI. Both 1.0 and 2.0 support uncompressed 1080p and Dolby 7.1. MHL 3.0 was released just a month before the Ultra hit the market, so it doesn't have 3.0, which supports 4K and some other stuff.
The Z2 and beyond have MHL 3.0, and yes, it could be your cable. Be sure that it's 3.0 for the Z2 and 1.0/2.0 for the Z.