USBC DP alternate mode output not working

Discussion in 'UDOO BOLT' started by marcoAlfamation, Apr 4, 2022.

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  1. marcoAlfamation

    marcoAlfamation UDOOer

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    Hello,

    I just received my UDOO bolt V3 board, and I'm starting to test it.
    So far pretty much everything is OK, except the one and only feature I need the board for :( , the USBC alternate mode Displayport output.

    I use this adapter to plug it to the monitor:
    https://www.reichelt.com/de/en/usb-3-1-cable-c-male-to-dp-male-1-2-m-goobay-79295-p214745.html?r=1
    But it acts like nothing is connected at all.

    The OS installed is Ubuntu 21.10, and I plat to replace it with 22.04 once is out.

    Xrandr just tell me :
    DP-1 Disconnected (...
    DP-2 Disconnected (...

    Do you have any clue about what can be wrong?

    Thanks,

    Marco
     
  2. gl0p

    gl0p UDOOer

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    Hey, I know Ubuntu 21 and 22 are "expeirmental" in a way, meaning their not as fully tested as say 20. Some features may not work. I would try other operating systems, like Ubuntu 20 or windows 10 and see if your still having the same issue.

    In Ubuntu you can use "dmesg | grep hdmi" to see if its being initialized at all. If there are any errors you could google them and see what people say.
     
  3. ccs_hello

    ccs_hello UDOOer

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    Always install the most current AMD CPU/GPU driver (Ryzen V1605B)!

    re: DP-1 Disconnected (...
    Is it possibe it was due to HDCP negotiation error?

    I know the following config will always work:
    1. Find a universal USB-C "USB 3.x hub + HDMI output + SD Crd reader" all-in-one unit.
    Plug that unit's USB-C male side into UDOO Bolt's USB-C female port. (You can even power the BOLT thru that unit.)

    2. Connect a HDMI-to-HDMI (male-male) cable from that all-in-one unit to a known-working HDMI monitor.
     
  4. marcoAlfamation

    marcoAlfamation UDOOer

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    It's connected to a normal monitor and i coud not find anything HDCP related in the bios settings.

    Unfortunately i need DP alternate mode to work properly, even if this setup works it would make no difference.

    I have an update about my previous post:
    It's the hotplug that is not working, if I start with the port connected the display stays on.
    If you try to plug and unplug the USB C with your adapter, do you get the video back?

    I tested the same cable with the same monitor and the same HDD (with the software) with a laptop with a thunderbolt port, works flawlessly.

    I would also say that the OS or the software has little to do with this, since i can reproduce the problem even when navigating the bios.

    I guess there is something with the firmware handling the PD protocol.

    My setup equal to the most basic USB-DP test setup, i think this feature has been tested and proved working...

    Thanks for your reply!
     
  5. bhojak

    bhojak UDOOer

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