Raspberry Pi 4 no HDR

    The Raspberry Pi 4 plays videos in 4K but without HDR.

    On the default settings, the monitor indicates "no signal" in 4K resolution, only using dtoverlay=vc4-kms-v3d,cma-512 works.

    I bought this Raspberry Pi in January 2020 and so far it doesn't work what was in the specification. Is there any chance it will ever work?

    Raspberry Pi 4 (4GB)

    LibreELEC 20.3 (20.3.0)

    Git: 20.3-Nexus

    HDR works fine on RPi4/5 in LE11/12 and has done for ages. Put Kodi in debug mode, reboot, then run "pastekodi" from the console and share the URL so we can see what display capabilities are advertised in the TV's EDID data.

    EDID:

    hastebin

    LibreElec in the PC version plays 4K movies with HDR on this monitor without any problem. Unfortunately only from a flash drive, because bad shim signature after installation, and I don't want to disable secure boot. And Linux doesn't support HDR yet, supposedly next month.

    The Kodi log isn't from an LE12 nightly image so it won't contain the EDID info that I'm looking for which is easier to read and more explicit about HDR support than tvseervice output. However, the Kodi log only shows Pulseaudio BT audio (no HDMI outputs) which is already a strong hint that EDID data is not being passed correctly on the HDMI cable. I also think "dtoverlay=vc4-kms-v3d,cma-512" is wrong as this should not be needed (it's not set by default in our RPi images). It's probably forcing HDMI output in some way, but it should not need to be forced in the first place.

    9/10 problems with HDMI on RPi4/5 boards are related to bad cables (or use of Argon cases with shitty connectors) so the first thing I'd try is a different cable.

    There is miscommunication between RPi4 and TV. So please double-check whether your HDMI cable is conform to HDMI 2.0 or 2.1 standard:

    Code
    2024-01-31 20:55:33.814 T:878     error <general>: [display-info] Error parsing EDID:
2024-01-31 20:55:33.814 T:878     error <general>: [display-info] ----------------------------------------------
2024-01-31 20:55:33.814 T:878     error <general>: [display-info] Block 1, CTA-861 Extension Block:
2024-01-31 20:55:33.814 T:878     error <general>: [display-info]   Video Capability Data Block: IT video formats are always underscanned, but bit 7 of Byte 3 of the CTA-861 Extension header is set to overscanned.
2024-01-31 20:55:33.814 T:878     error <general>: [display-info] 
2024-01-31 20:55:33.814 T:878     error <general>: [display-info] ----------------------------------------------

    You have network timeouts. Please try to play the same video from USB stick:

    Code
    2024-01-31 20:58:03.716 T:885     debug <general>: ActiveAE::SyncStream - average error of 35.362936, start adjusting
2024-01-31 20:58:03.716 T:885     debug <general>: ActiveAE::SyncStream - average error 0.362936 below threshold of 30.000000
2024-01-31 20:58:03.719 T:878     debug <general>: CDRMUtils::DrmFbDestroyCallback - removing framebuffer: 342
2024-01-31 20:58:03.732 T:878     debug <general>: CDRMUtils::DrmFbDestroyCallback - removing framebuffer: 343
2024-01-31 20:58:08.774 T:1068  warning <general>: OutputPicture - timeout waiting for buffer
2024-01-31 20:58:16.440 T:1069     info <general>: Skipped 144 duplicate messages..