My TV is LeEco 4K TV (Letv) and I am using Chromecast with Google TV 4K, earlier in both EDID 1.3 and EDID 2.0 mode, it used to display the all resolutions. But after October patch, with EDID 2.0 it always showing only two resolutions options 480p and 720p. With EDID 1.3 it is showing all the options.
I have collected the EDID that is sent by TV to Chromecast. In case of EDID 2.0 TV is not sending standard timings, but is sending the native resolution as 4K, still Chromecast is showing max resolution as 720p.
It would be good to look at the native resolution and provide that option.
Others also facing the similar issues: https://www.googlenestcommunity.com/t5/Chromecast/Cause-of-Chromecast-Resolution-Fixed-at-720p/m-p/5...
Use EDID viewer: https://people.freedesktop.org/~imirkin/edid-decode/
Working EDID 1.3: (4k 30p)
0x00 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0x00 0x32 0x96 0x02 0x0B 0x00 0x00 0x00 0x00 0x0C 0x1A 0x01 0x03 0x80 0x6F 0x3E 0x78 0x0A 0xCF 0x74 0xA3 0x57 0x4C 0xB0 0x23 0x09 0x48 0x4C 0x21 0x08 0x00 0x81 0x80 0x45 0x40 0x61 0x40 0x95 0x00 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x01 0x04 0x74 0x00 0x30 0xF2 0x70 0x5A 0x80 0xB0 0x58 0x8A 0x00 0xBA 0xA8 0x42 0x00 0x00 0x1E 0x02 0x3A 0x80 0x18 0x71 0x38 0x2D 0x40 0x58 0x2C 0x45 0x00 0x5D 0x54 0x21 0x00 0x00 0x1E 0x00 0x00 0x00 0xFC 0x00 0x4C 0x65 0x74 0x76 0x20 0x53 0x75 0x70 0x65 0x72 0x54 0x56 0x0A 0x00 0x00 0x00 0xFD 0x00 0x2F 0x3F 0x7A 0x8C 0x1E 0x00 0x0A 0x20 0x20 0x20 0x20 0x20 0x20 0x01 0xC3
Not working EDID 2.0: (Only 720p)
0x00 0xFF 0xFF 0xFF 0xFF 0xFF 0xFF 0x00 0x32 0x96 0x02 0x0B 0x00 0x00 0x00 0x00 0x0C 0x1A 0x01 0x03 0x80 0x6F 0x3E 0x78 0x1A 0x0D 0xC9 0xA0 0x57 0x47 0x98 0x27 0x12 0x48 0x4C 0x21 0x08 0x00 0x01 0x00 0x01 0x00 0x01 0x00 0x01 0x00 0x01 0x00 0x01 0x01 0x01 0x01 0x01 0x01 0x04 0x74 0x00 0x30 0xF2 0x70 0x5A 0x80 0xB0 0x58 0x8A 0x00 0xBA 0xA8 0x42 0x00 0x00 0x1E 0x02 0x3A 0x80 0x18 0x71 0x38 0x2D 0x40 0x58 0x2C 0x45 0x00 0x5D 0x54 0x21 0x00 0x00 0x1E 0x00 0x00 0x00 0xFC 0x00 0x4C 0x65 0x74 0x76 0x20 0x53 0x75 0x70 0x65 0x72 0x54 0x56 0x0A 0x00 0x00 0x00 0xFD 0x00 0x17 0x3F 0x0F 0x8C 0x3C 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x01 0x1B
