Raspberry Pi4 4k 60Hz LibreELEC 10.0.2

    I have a Raspberry Pi4 running LibreELEC 10.0.2 with an LG C1 OLED. I have tried 3 different HDMI 2.0 cables from 3 different sellers but I cannot select a 3840X2160P resolution with a refresh rate higher than 30Hz

    This page recommends adding the modes to config.txt:

    https://wiki.libreelec.tv/configuration/4k-hdr

    Quote

    Recommendation: Configure Kodi to allow the following modes, if available:

    • 3840x2160 @ 60/59.94/50/30/29.97/25/24/23.976
    • 1920x1080 @ 60/59.94/50/24/23.976

    I have been searching but I haven't been able to find the actual syntax to do this, I did not try copying in the exact line from the quote as I'm afraid of breaking things. Does anyone know the exact syntax?

  • Go to Best Answer

    The obvious Q is .. do you actually have 4K60 media (other than test media)? .. If the answer is 'no' then don't worry about something that you don't need. Most people do not need 4K60 modes. NB: Some TVs only support 4K60 on specific ports .. no idea about the C1 but it might be worth experimenting with different ports and seeing if needs to be enabled in menus on the TV side.

    For 4kp60 to work you need hdmi_enable_4kp60=1 in config.txt and also enable "Ultra HDMI deep color" on the HDMI port in your TV's settings.

    so long,

    Hias

    Quote from HiassofT

    enable "Ultra HDMI deep color" on the HDMI port in your TV's settings

    Are you sure, that "Ultra HDMI deep color" is mandatory? I mean this wording, or is it enough that the monitor supports 10bit?

    I am asking this, because I can't get 4k@60Hz work with my PI400 and a ASUS PA328Q , but this monitor works with 4k@60Hz and a dvb/enigma-box. See attachment.

    So this means that monitor supports 4k@60Hz, but maybe there is a limit from the side of the PI400.

    • Best Answer

    It's definitely needed as otherwise the maximum will be 4kp30 at RGB 4:4:4 8bit - usually the TV also advertise the HDMI 1.4-compatible "fake" 4kp60 YCC 4:2:0 mode but the RPi doesn't support it (only 4:4:4 and 4:2:2).

    No idea about that Asus thing though.

    so long,

    Hias

    Quote from HiassofT

    No idea about that Asus thing though.

    To make it clear, the Asus is a professional pc-monitor.

    Quote

    https://www.asus.com/displays-deskt…display-pa328q/

    Be immersed in stunning 4K/UHD visuals with the PA328Q. It is equipped with DisplayPort 1.2, mini-DisplayPort 1.2, two HDMI ports, and a HDMI-1 / MHL 3.0 port*. PA328Q supports 4K/UHD content playback at 60Hz through HDMI-1 port or DisplayPort 1.2

    1. HDMI-1 port supports 4K/UHD playback at 60Hz and the YCbCr 4:2:0 color format

    2. HDMI-2, HDMI-3, and MHL 3.0 ports support 4K/UHD playback at 30Hz

    Since the monitor supports YCbCr 4:2:0 only, I am guessing, that the enigma-box AX HD61 supports YCbCr 4:2:0 and therefore it works.