help needed : S912 box and rgb output on old Philips/Sony Tv's

  • hi,


    I tried asking this question in the s912 thread.

    I am running libreelec 8.1.9 version on s912 h96+ box. and I have old Philips TV.


    on versions before 8.0.2.e you could force the rgb output with this command


    #!/bin/sh echo 1 > /sys/class/amhdmitx/amhdmitx0/output_rgb


    however the newer version of libreelec doesn't support this configuration via autostart.sh file.


    if I downgrade to 8.0.2x and execute this command I loose audio via hdmi.


    I have read here something about configuring 8bits/10bits display to force rgb.


    I was wondering if someone here could help me with this issue. I would like to keep up with the updates of libreelec, but I am too beginner to know what and where to configure, so my TV screen does not randomly go green/pinkish when I am in the middle of watching a movie.


    I asked this question in s912 thread too, but only received short replies and no workarounds. hence why I am asking it here.


    please provide me with some guidance how to fix this problem. thank you

  • Unless your TV provides a way to switch colorspace, there is no way to fix this issue in 8.1.x.

  • what features name or/ specifications should I be looking for to find out if the TV offers colorspace or not.


    thank you for your quick reply

  • Can you try running this command: echo cs0 > /sys/class/amhdmitx/amhdmitx0/debug

    nothing happens unfortunately.

    I tried it when the screen was green/pinkish

    and when the output was RGB



    edit: updated to the latest version. still no changes

    Edited once, last by samgarcia ().

  • Tried it on S905X. Removed all the other settings from autostart, entered the new, rebooted and played a video. Screen turned pink after a few minutes. Nothing in the dmesg after the change to pink.


    FXeF

    Wetek Hub: LibreElec 8.2.3.1 (Philips 42PFL8404)
    MK808B+: LibreElec 7.0.2.7 (Samsung UE55H6270)
    OTT MXQ Pro 4k (S905): LibreElec 7.0.3.12k (Denon X1200W, 7.1, LG PF1500G)
    AKASO HM8 (S905X): CoreElec 9.0 dev build, Acer Revo 3610: Milhouse test

  • I have the same problem with my Panasonic Plasma.


    However, I have the option RVB colour scale : full / normal.... but the pink/green screen ate still here even when I change the option.


    I'm now on the 8.0.2e version, and everythings works fine.

  • I can confirm the problem with 8.1.9. It exists on two different Monitors from Dell on a Coolme S905X.

    Here the screen is pink/green from the start.

    I'm now on the 8.0.2e version, and everythings works fine.


    Thanks to iskonje, this solution also works for me for now.

  • it is not a problem with Libreelec, it is a problem with RGB settings with old Tv/Screens.


    the reason for 8.0.2.X working fine is because @kszag made a special patch around that time.


    but since that version libreelec and built in Kodi have been heavily updated.


    I am willing to participate and help out with the development of a patch to Force RGB output on 8.1.X versions. just let me know how I can help

  • Just wanted to point to the same problem on the same SoC, where the issue was solved by an option in a new firmware:


    incompatible YCbCr and RGB


    The author has the opinion, that there might an incompatibilty between the Box and the monitor/TV, so having the option to switch to RGB is solving in his case.

    I haven't found this possibility in the libreelec, or am I mistaken?

  • Just wanted to point to the same problem on the same SoC, where the issue was solved by an option in a new firmware:

    Closed source Android firmware is not helpful for us. Resolving this issue requires modifying kernel code.


    Switching to RGB 10bit mode should be possible by echo 'rgb,10bit' > /sys/class/amhdmitx/amhdmitx0/attr

  • Switching to RGB 10bit mode should be possible by echo 'rgb,10bit' > /sys/class/amhdmitx/amhdmitx0/attr

    Could I get Full RGB range by similiar command? after this command I have

    Jan 05 10:25:29 CoreELEC kernel: hdmitx: video: Bit depth: 10-bit, Colour range RGB: limited, YCC: limited, Colourspace: RGB

    on Odroid C2. :(

    2x VIM3L, 3x X96 Air P3, 6x C2; 6x RPi2; 3x Win7 Kodi + vPeter's mariaDB plugin as Library DB