Dolby Vision not working on Xiaomi TV Box S 3rd Gen (S905X5M) with Philips TV mled820
After a completely clean CoreELEC installation with the dovi.ko module, the Dolby Vision options are not available in CoreELEC Settings.
Software
CoreELEC 22.0-Piers nightly, kernel 5.15.196, built August 9, 2026
Amlogic S905X5M / S6
dovi.ko: dovi_gen_5_15_2026
The CoreELEC installation was otherwise clean, using the corresponding Xiaomi device configuration and the dovi.ko module described above.
In particular, I do not have the Dolby Vision settings for selecting TV-Led / Player-Led.
The Xiaomi with coreelec does not recognize Dolby Vision and falls back to HDR10.
As a control test, I tested the same Philips TV mled820 using Google TV with PM4K in Kodi. Dolby Vision Profile 5 is correctly recognized by the TV, while Dolby Vision Profiles 7 and 8 fall back to HDR10.
With CoreELEC, however, all the Dolby Vision profiles I tested (including P5, P7 and P8) fall back to HDR10 on the Philips TV.
This shows that the TV itself does support Dolby Vision, at least for Profile 5, and that the problem is specifically related to the CoreELEC/Amlogic S6 Dolby Vision/HDMI path or its Dolby Vision negotiation with the Philips TV.