Here is the EDID, is there any hints? This TV also have HDR mode.
(Edit: Directly attached instead of links of google drive)
Toshiba_43G20X_Normal.bin: When my TV is set to the Normal Mode.
Toshiba_43G20X_High.bin: When is High-speed signal mode
Toshiba_43G20X_High_HDR.bin: When is High-speed signal mode + enabled HDR mode
I'm trying every hotfix, so far, (until 16.11.3,) it still have this issue.
Though HDMI 2.0 is one of major feature of RX4xx series,
because of this issue, sadly I have to (still) use Club3D Adapter CAC-1070.
I hope this problem to be solved soon.
I tried 16.12.1 but it still no improvements, so Finally I bought GTX 1060 for testing.
I used HDMI same as before. It works perfectly.
There is no problem even turn off then on the TV, resume from "turn off the display" function of Windows.
I'm sure there is something problem with Radeon's HDMI 2.0 function.
I like recent update such as Crimson ReLive, so I wish this problem to be solved soon.