No image after booting LibreElec

  • Hardware:


    NUC6CAYH PC with LibreElec 8.01 Generic installed
    TV is a LG 49UH610V
    Receiver is a Pioneer VRX-830


    I get no video-image when I boot-up my NUC with LibreElec if my PC is connected to the receiver. I do get an image if I directly connect my NUC to the TV. Furthermore, when I installed Windows 10 on it I did get my screen working fine when the NUC was connected to the receiver.


    I'm abit at a loss at what I can do. I imagine LibreElec is trying to set an unsupported resolution/refresh-rate or something when it is connected to the receiver, but I seem to unable to fix this.


    Perhaps anyone has some pointers? I tried both the Generic LibreElec 8.01 and the one with HEVC265-10bit support with the 4.11 kernel. Neither gives a video-image on my setup. What gives? And more importantly, what can I do to resolve this strange situation.

  • Try bypassing the Pioneer AVR and connect the NUC directly to the TV.


    Boot up LibreELEC, log in via SSH and get use the result of:

    Code
    1. xrandr | pastebinit
  • Done:
    aMRh
    Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767


    DP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
    3840x2160 60.00 + 30.00 25.00 24.00 29.97 23.98
    4096x2160 24.00 23.98
    1920x1080 60.00 50.00* 59.94 30.00 25.00 24.00 29.97 23.98
    1920x1080i 60.00 50.00 59.94
    1280x1024 60.02
    1360x768 60.02
    1152x864 59.97
    1280x720 60.00 50.00 59.94
    1024x768 60.00
    800x600 60.32
    720x576 50.00
    720x480 60.00 59.94
    640x480 60.00 59.94
    720x400 70.08
    DP2 disconnected (normal left inverted right x axis y axis)
    VIRTUAL1 disconnected (normal left inverted right x axis y axis)

  • The output says that the TV is connected at 1080p.
    Is that indeed the case, with LE visible on your TV?

  • I manually set the resolution during the test to 1920x1080. I generally run the Kodi GUI in 1920x1080p so that Kodi doesn't upscale everything to 4K (Kodi up-scaler sucks compared to what the TV does, imo).


    However, when connected to the TV it can also run on 4K no problem. I just set it to 1920x1080p (which I want to do when connected "through" the receiver too).

  • Connect the NUC to the TV and dump the EDID using the embedded "getedid" script that configures Xorg so it believes the TV is always connected. If you're lucky that overrides whatever the Pioneer AVR is screwing up.

  • With the Pioneer in the loop I get:
    LPEIScreen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
    DP1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 1600mm x 900mm
    3840x2160 60.00*+ 30.00 25.00 24.00 29.97 23.98
    4096x2160 24.00 23.98
    1920x1080 60.00 50.00 59.94 30.00 25.00 24.00 29.97 23.98
    1920x1080i 60.00 50.00 59.94
    1280x1024 60.02
    1360x768 60.02
    1152x864 59.97
    1280x720 60.00 50.00 59.94
    1024x768 60.00
    800x600 60.32
    720x576 50.00
    720x480 60.00 59.94
    640x480 60.00 59.94
    720x400 70.08
    DP2 disconnected (normal left inverted right x axis y axis)
    VIRTUAL1 disconnected (normal left inverted right x axis y axis)


    and with this I get no image.


    I did learn that if I set Kodi to 1920x1080p 60 Hz. with it directly connected to my TV and then switch the NUC to the HDMI on the receiver I get an image.


    So it is somehow that the resolution set by Kodi during boot-up is not supported by my receiver for whatever reason. I guess I have to fix KODI to 1920x1080p but I noticed it has a tendency to reset occassionally... ugh :(

  • I saw the same issue with my ASRock J3455 Apollo Lake, my LG 4K TV and my Onkyo TX-NR626 receiver. What I basically had to do was create a /storage/config/autostart.sh file with the following content. You can sub DP2 for DP1. I think this may be a bug in Libreelec as the it should output the resolution to what's set, regardless of the connected device.


    Code
    1. (
    2. xrandr --output DP2 --mode 1920x1080 --rate 60.00
    3. ) &