Had the 4.5.4 for a while now. Interesting that using the Amazon slim-hdmi adapter to send YouTube videos to the TV, the fire hdx 8.9 can be charged at the same time & that the charging charges the fire hdx quicker than the discharge! Prior to the 4.5.4, connecting the charger to the adapter, only slowed down the discharge rate.
The Galaxy Tab Pro 8.4 still discharges rapidly when connecting to the charger. In my case, the Galaxy won't even send a signal to the TV/AVR without being connected to the charger.
The only "problem" is that the sound is on/off & the "on" is VERY loud compared to what is normally used/set.
Don't know if using the "UFC" or mira-cast will work the same way on the fire hdx when it is connected to a charger.
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