Good news and not so good news... I was in my local Best Buy this morning. Saw they had 1 of the new AFTV HDR's. Grabbed it!
During lunch. I set it up.
I have a Denon X2200W that I plug all my devices into - an NVidia Shield TV and Roku Ultra and now the AFTV HDR. The Denon feeds a Samsung UN65JS8500 4K UHD TV that supports HDR.
I had a Fire TV 4K in the same chain and moved that to my basement TV.
I plugged the new AFTV HDR into the same HDMI input as the orginal AFTV
Ok, started it up, let it update, signed in and off the the races. First, under Settings -> Display and Sound there are some new setttings. I left the resolution to 4K Auto (I am hoping/assuming this implies auto frame rate switching). Under Depth there is 8 bit, 10 bit and 12 bit. 8 was the default so I changed it to 10 bit. Under Color Space it lets to select RGB (default) or YCbCr. I selected YCbCr.
First test - started Netflix and started to watch a movie that had the HDR badge. The AFTV HDR went into HDR mode (as did the TV) and it played the movie. Looked ok. Stopped playing and exited Netflix.... HDR still ON!!! Home screen is all blown out. So, went back into Netflix and tried playing a non HDR 4K movie. HDR stayed on... Exited Netflix - HDR still on - home screen blown out. Reset AFTV HDR - all back to normal.
Experiment #2 This time went into Amazon Video. Played Grand Tour. HDR mode goes on and Grand Tour looks great. Stop playing video and exit to home screen. HDR still on.... home screen and images are all blown out, over saturated... Went back into Amazon Video and tried a non-HDR movie. HDR still enabled - move is not looking good ;-) Reset AFTV HDR - back to normal.
Last experiment - Go into Amazon Video - play Grand Tour. HDR kicks in, looks good. Exit video and HDR still enabled. This time, I changed the input on the Denon AVR from the AFTV HDR to any other input (in this case the Roku). Then, went back and selected the input the AFTV HDR is plugged into. Interesting, HDR is now off and everything is back to normal.
As a side, the NVidia Shield is a good example of switching back and forth correctly. The Netflix app only switches into HDR mode when the source is HDR and exits as soon as you exit the movie. Kodi/SPMC (on the NVidia Shield) also handle gracefully going in and out of HDR mode when appropriate.
So, long story short - if you get one the next few days keep an eye out on the AFTV HDR getting stuck in HDR mode when it shouldn't. If it gets stuck you will either need to reset the box or try switching HDMI inputs - maybe the HDMI handshake gets things back to normal.
I would think a software update with clear this issue up.
Interesting - you are right. When I plug the AFTV direct into the Samsung TV - HDR turns on and off correctly. There is some kind of interaction with the Denon AVR.
I seemed to recall some other devices having sensitivity to the Denon AVR's. I also have a NVidia Shield and Roku Ultra - both go through the Denon and don't exhibit any "stuck HDR" issues. For now, I can plug it into the TV and run optical for audio to the Denon.
I am hoping you guys (or Denon) can come up with a fix.
Hi yeah I just wanted to chime in here. I have a Sony STRDH770 receiver and am having the same trouble where the Fire TV seems to get stuck in HDR mode after exiting HDR content. I have tried auto, 8 and 10bit mode and still have the same issue.
I did connect directly to my Vizio P65-E1 and do not have the issue, so it does seem to be when the receiver is involved, like what is happening with JGrana as well.
I don't know if JGrana noticed this, but there is a difference in color quality as well, which you can see by just staying on the home menu. When connected to the TV it is more vibrant, and when connected to the receiver the colors are muted. I am using the same custom calibrated picture settings for both HDMI inputs.
I plugged back in my Fire TV Gen 2 and do not see any color quality differences between having it hooked to the TV and to the receiver. That issue seems to be isolated to the Fire TV Gen 3.
I wanted to add a little more testing.. I did flip between variations of Auto (Up to 4K) and fixed 2160p 60fps resolutions, and 8bit and "Up to 10 bit" panel settings, as well as between RGB and YCbCr. No combination fixed anything. However, switching between 8bit and 10bit did reset the HDR and turned it off, so that's a quicker way of turning it off for now than restarting the Fire TV completely.
I don't have a good reason on why the colors would be muted, but with the HDR, it almost seems like the software is not sending a notice out that HDR has been disabled when the content stops playing? I do notice that when I stop the content while the Fire is connected directly to the TV, the TV says it's in HDR mode, then flashes and goes back to "Normal". When connected to the receiver it just exits back to the menu, no flashing.
I would just like to add my Samsung HW-K950 soundbar to the list of affected AVRs. Works fine plugged into my LG OLED55B7A but plugged directly into my soundbar or plugged into a HDMI switch produces the stuck HDR.