Librelec 9.2.1 on rpi4 with Samsung television - no signal

1st Official Post

    Hello

    I have just installed a new Raspberry PI 4 with the last LibreElec version 9.2.1 in order to move from my olg RaspBerry Pi 3B.

    Everything was wroking fine with the previous hardware. When connecting the rpi4 on a monitor with HDMI port using the same cable, I get the image and the sound.

    My environment:

    • Raspberry pi 4 Model B Rev 1.1
    • Television: Samsung QE55Q82RALXXN

    I tried to find some answer using the search but what I found (see below) didn't change anything:

    Code
    hdmi_enable_4kp60=1


    Can someone point me to the right direction?

    I had a similar problem getting no signal through my AV Amp, and managed to solve it with this.

    Try ssh-ing in while it's connected to the Samsung and then input

    Code
    tvservice --explicit "CEA 16 HDMI"
    • Official Post
    Quote from PadreMartini
    Code
    tvservice --explicit "CEA 16 HDMI"

    If this screen mode works, then you can make it permanent by adding this lines to config.txt:

    Code
    hdmi_ignore_edid=0xa5000080
framebuffer_width=1920
framebuffer_height=1080
hdmi_force_hotplug=1
hdmi_group=1
hdmi_mode=16

    Remove this, because 4K / 60Hz content is not in common use, and it can cause trouble:

    Code
    hdmi_enable_4kp60=1
    Quote from Klojum

    How did you manage that? The RPi3 has a HDMI port, the RPi4 has a micro-HDMI port.

    Perhaps your adapter cable is having a compatibility issue?

    If it's working on a monitor having a HDMI port, I might suppose that the same cable can be used with a television.

    • Official Post

    The HDMI cable has to fulfill HDMI 2.0 or 2.1 standard to work on 4K devices. If your monitor is not 4K, then it's not a proof of complete function. On a 4K device, data transfer will speed up.

    Any results when using the described setting at config.txt? It's a proved solution for many problematic TV's.

    Doesn't work. The cable is the original one (Official Raspberry Pi MicroHDMI Cable) sold by The Pi Hut.

    Without modification of the config.txt:

    LibreELEC:~ # tvservice -l

    1 attached device(s), display ID's are :

    Display Number 2, type HDMI 0

    LibreELEC:~ # tvservice -m CEA

    Group CEA has 4 modes:

    mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive

    mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive

    mode 95: 3840x2160 @ 30Hz 16:9, clock:297MHz progressive

    mode 97: 3840x2160 @ 60Hz 16:9, clock:594MHz progressive

    LibreELEC:~ # tvservice -m DMT

    Group DMT has 1 modes:

    (prefer) mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive


    With modification of the config.txt:

    LibreELEC:~ # tvservice -l

    1 attached device(s), display ID's are :

    Display Number 2, type HDMI 0

    LibreELEC:~ # tvservice -m CEA

    Group CEA has 14 modes:

    mode 1: 640x480 @ 60Hz 4:3, clock:25MHz progressive

    mode 2: 720x480 @ 60Hz 4:3, clock:27MHz progressive

    mode 3: 720x480 @ 60Hz 16:9, clock:27MHz progressive

    mode 4: 1280x720 @ 60Hz 16:9, clock:74MHz progressive

    mode 5: 1920x1080 @ 60Hz 16:9, clock:74MHz interlaced

    (prefer) mode 16: 1920x1080 @ 60Hz 16:9, clock:148MHz progressive

    mode 17: 720x576 @ 50Hz 4:3, clock:27MHz progressive

    mode 18: 720x576 @ 50Hz 16:9, clock:27MHz progressive

    (native) mode 19: 1280x720 @ 50Hz 16:9, clock:74MHz progressive

    mode 20: 1920x1080 @ 50Hz 16:9, clock:74MHz interlaced

    mode 31: 1920x1080 @ 50Hz 16:9, clock:148MHz progressive

    mode 32: 1920x1080 @ 24Hz 16:9, clock:74MHz progressive

    mode 33: 1920x1080 @ 25Hz 16:9, clock:74MHz progressive

    mode 34: 1920x1080 @ 30Hz 16:9, clock:74MHz progressive

    LibreELEC:~ # tvservice -m DMT

    Group DMT has 19 modes:

    mode 4: 640x480 @ 60Hz 4:3, clock:25MHz progressive

    mode 5: 640x480 @ 72Hz 4:3, clock:31MHz progressive

    mode 6: 640x480 @ 75Hz 4:3, clock:31MHz progressive

    mode 8: 800x600 @ 56Hz 4:3, clock:36MHz progressive

    mode 9: 800x600 @ 60Hz 4:3, clock:40MHz progressive

    mode 10: 800x600 @ 72Hz 4:3, clock:50MHz progressive

    mode 11: 800x600 @ 75Hz 4:3, clock:49MHz progressive

    mode 16: 1024x768 @ 60Hz 4:3, clock:65MHz progressive

    mode 17: 1024x768 @ 70Hz 4:3, clock:75MHz progressive

    mode 18: 1024x768 @ 75Hz 4:3, clock:78MHz progressive

    mode 21: 1152x864 @ 75Hz 4:3, clock:108MHz progressive

    mode 28: 1280x800 @ 60Hz 16:10, clock:83MHz progressive

    mode 32: 1280x960 @ 60Hz 4:3, clock:108MHz progressive

    mode 35: 1280x1024 @ 60Hz 5:4, clock:108MHz progressive

    mode 36: 1280x1024 @ 75Hz 5:4, clock:135MHz progressive

    mode 47: 1440x900 @ 60Hz 16:10, clock:106MHz progressive

    mode 48: 1440x900 @ 75Hz 16:10, clock:136MHz progressive

    mode 51: 1600x1200 @ 60Hz 4:3, clock:162MHz progressive

    mode 58: 1680x1050 @ 60Hz 16:10, clock:146MHz progressive

    • Official Post
    Quote from micj1420

    Doesn't work. The cable is the original one (Official Raspberry Pi MicroHDMI Cable) sold by The Pi Hut.

    I wouldn't count on that "official" cable too much (source).

    Your TV seems to be a new one, so it shouldn't be on the list of problematic old TV's (which need a workaround at config.txt).

    I would buy another microHDMI cable (2.0 or 2.1 standard), and remove the workaround at config.txt.

    The list of provided screen modes looks OK, I think the cable is just too slow to deliver them.

    Quote from Da Flex

    I wouldn't count on that "official" cable too much (source).

    Your TV seems to be a new one, so it shouldn't be on the list of problematic old TV's (which need a workaround at config.txt).

    I would buy another microHDMI cable (2.0 or 2.1 standard), and remove the workaround at config.txt.

    The list of provided screen modes looks OK, I think the cable is just too slow to deliver them.

    It's a brand-new Samsung .... I just ordered a new cable from Amazon ... expect to get it tomorrow if Covid-19 allows.