RPI4 only 4k@30hz: EDID shows 4k@60hz support but tvservice does not?

  • Hello.

    I'm having a hard time getting 4k@60hz working on my Raspberry Pi 4 even though it is supported by both my TV (LG OLED B9) and amp (Denon avr x520). For some reason that is beyond my searching capabilities EDID shows 4k@60hz as both supported and as preferred CEA, but tvservice -m CEA does not:

    edidparser:

    tvservice -m CEA:

    Trying to force HDMI to mode 97 in config.txt with hdmi_group=1 hdmi_mode=97 doesn't work:

    Code
    tvservice -s
    state 0xa [HDMI CUSTOM RGB lim unknown AR], 4096x2160 @ 30.00Hz, progressive

    :/

  • I've no idea what the issue is, but it's best to run the GUI at 1080p with 4K modes (23.976/24/50/59.94/60) in the whitelist for playback. RPi4 may be a leap forwards in terms of Pi hardware and processing but it's still a low-power ARM board.

  • Hi,

    Im no expert but I manage to get 4K60fps on my RPI4 by :


    - (obviously) Enabling the 4k60fps feature in config.txt : hdmi_enable_4kp60=1

    - Using a HDMI 2.1 cable

    - Enable HDMI UHD Color feature on my TV

    The UHD Color feature was the last thing I did that finally resolve my problem.

    Hope that helps.

  • chewitt

    "....GUI at 1080p with 4K modes (23.976/24/50/59.94/60) in the whitelist for playback...."

    Do I need to touch "Resolution" or just go with the default and only change GUI and whitelist?

    Thanks