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Beaglebone Black HDMI and LCD problem

user4621828
Prodigy 20 points

I have a beaglebone black, and I use ti-processor-sdk-linux-am335x-evm-02.00.01.07 to run linux on it. I have a couple of questions regarding HDMI and LCD display.


My problem is that I can't run LCD display when there is no HDMI monitor connected to Beaglebone. I'm trying to run Qt application using eglfs plugin to display graphics. When there is a LCD and HDMI monitor connected to BBB I can run this application, and I do see application window on both screens. However as soon as I disconnect HDMI monitor my LCD screen also gets black. When I try to run my application without HDMI monitor connected to BBB i get this output message:

"PVR: Hint: Setting WindowSystem to libpvrDRMWSEGL_FRONT.so

ignoring unused connector 20
Could not initialize egl display
Aborted"

I can't find any information on the internet about  "ignoring unused connector 20" message.

Is there a way to disable HDMI interface in BBB running Linux 4.1.13 ? I will need to use SPI interface, and it collides with HDMI.

I would be thankful for any help.

  • 0
    TI__Guru 65405 points
    Hi User4621828,

    The HDMI interface of BBB can be disabled by some modification of the kernel defconfig file. You should comment or remove the following nodes:
    CONFIG_DISPLAY_CONNECTOR_HDMI=y
    CONFIG_OMAP2_DSS_HDMI_COMMON=y
    CONFIG_HDMI=y
    then rebuild the kernel.

    BR
    Tsvetolin Shulev
  • 0 in reply to Cvetolin Shulev-XID
    Prodigy 20 points
    I think I need to update my DTS file and recompile it. I have dts overlays from 3.8 kernel, and using those overlays I was able to disable HDMI and enable LCD in 3.8 kernel. Now with ti-processor-sdk-linux-am335x-evm-02.00.01.07 comes linux kernel v 4.1.13-g8dc6617
    and I don't see /boot/uEnv.txt file, also I don't see cape manager program . Is there a way to enable dts overlays in linux 4.1.13 ?