[Philips, Sony, TCL Android TV] gotanda:
I have played with C635 for a few days and I made an assumptions that all apps (except YouTube, Netflix and so on) have only one display mode - 1920x1080 @ 60.

Is it true? Is there something I can do to allow apps use other display modes?

My guess based on following facts:

1) Every player (Plex, Kodi, VLC) playing 4K video with «original» picture size just show me cropped picture - so I guess, when I change size setting to «fit screen» - TV just downscale 4K to 1080

2) App logs - the only mode I can see in there is 1920x1080 @ 60

2.1) Plex

…
03-14 19:26:42.478 i: [MediaDecisionEngine] Analyzing media: 3840x2160 21988kbps (Container: mkv, Video: h264, Audio: ac3)
03-14 19:26:42.481 i: [Player][DimensionsLayout] Resizing: 100 x 100
03-14 19:26:42.482 i: [DisplayBehaviour] Activity has been changed, searching for available modes.
03-14 19:26:42.488 i: [DisplayBehaviour] Current mode detected as 1920x1080 @ 60,0000Hz (1).
…
03-14 19:26:43.367 i: [DisplayBehaviour] Mode found: 1920x1080 @ 60,0000Hz (1) (Score: 124,72 (RR: 0,00 R: 124,72)
03-14 19:26:43.368 i: [DisplayBehaviour] Best mode for 3840x2160 @ 23,976000Hz selected as 1920x1080 @ 60,0000Hz (1).
03-14 19:26:43.369 i: [DisplayBehaviour] Mode is already set to our best mode of 1920x1080 @ 60,0000Hz (1).
…
03-14 19:26:47.369 i: [ExoPlayer][EventLogger] tracks [eventTime=5.27, mediaPos=0.00, window=0, period=0
03-14 19:26:47.370 i: [ExoPlayer][EventLogger] group [
03-14 19:26:47.371 i: [ExoPlayer][EventLogger] [X] Track:0, id=0, mimeType=video/avc, codecs=h264, res=3840x2160, fps=23.976025, supported=YES
03-14 19:26:47.374 i: [ExoPlayer][EventLogger] ]
…
03-14 19:26:48.643 i: [ExoPlayer][EventLogger] videoDecoderInitialized [eventTime=6.55, mediaPos=0.00, window=0, period=0, OMX.realtek.video.decoder]
03-14 19:26:48.647 i: [ExoPlayer][EventLogger] videoInputFormat [eventTime=6.56, mediaPos=0.00, window=0, period=0, id=0, mimeType=video/avc, codecs=h264, res=3840x2160, fps=23.976025]

2.2) Kodi

App Start

2023-03-15 19:12:20.594 T:2890 debug <general>: CAndroidUtils: ProbeResolutions: 1920x1080
2023-03-15 19:12:20.594 T:2890 info <general>: CAndroidUtils: Current resolution: 1920x1080 1920x1080 @ 60.000004 - Full Screen
2023-03-15 19:12:20.602 T:2890 info <general>: CAndroidUtils: SetNativeResolution: 1: 1920x1080 1920x1080@60.000004

4K video start playing

2023-03-15 19:14:12.526 T:3198 info <general>: [WHITELIST] Searching the whitelist for: width: 3840, height: 2160, fps: 23.976, 3D: false
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Using the default whitelist because the user whitelist is empty
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Searching for an exact resolution with an exact refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No match for an exact resolution with an exact refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Searching for an exact resolution with double the refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No match for an exact resolution with double the refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Searching for an exact resolution with a 3:2 pulldown refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No match for a resolution with a 3:2 pulldown refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Searching for a desktop resolution with an exact refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No match for a desktop resolution with an exact refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Searching for a desktop resolution with double the refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No match for a desktop resolution with double the refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] Searching for a desktop resolution with a 3:2 pulldown refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No match for a desktop resolution with a 3:2 pulldown refresh rate
2023-03-15 19:14:12.526 T:3198 debug <general>: [WHITELIST] No resolution matched
2023-03-15 19:14:12.527 T:3198 info <general>: Display resolution ADJUST : 1920x1080 @ 60.000004 - Full Screen (16) (weight: -0.000)