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

    Quote from kszaq

    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 (October 8, 2017 at 2:36 AM).

    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

    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.

    Quote from iskonje

    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?

    Quote from Nogo

    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

    Quote from kszaq

    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. :(