HDMI Display in clone mode not working on imx8m plus

Technical Support
, , , , ,
1

I am currently working on a project, I have Verdin Toradex Development Board iMX8M Plus , with two HDMI connectors.

Kernel Version : 5.4
U-boot Version : 2020.04

My objective is to set up a cloning configuration for dual HDMI displays, but I am encountering difficulties in achieving this setup.

I have attempted the following steps to configure the cloning mode:

  1. I have modified the U-Boot environment variables using the following settings:
    “setenv setupargs console=tty1 console=ttymxc2,115200 consoleblank=0 earlycon video=HDMI-A-1:1280x720-16@60D video=HDMI-A-2:1280x720-16@60D”

  2. I experimented with two variations of the weston.ini configuration files:

    1. weston.ini file

    [output]
    name=HDMI-A-1
    mode=1920x1080@60
    #transform=90

    [output]
    name=HDMI-A-2
    mode=1920x1080@60
    #transform=90

    [output]
    name=HDMI-A-1
    mode=off

    [output]
    name=HDMI-A-1
    same-as=HDMI-A-2

Despite making these changes, both HDMI displays initialize simultaneously during boot-up. However, when I run applications such as Qt or play an MP4 video, the content is only visible on one of the display.

I did notice an interesting behavior during the flashing process using tezi.itb . At this stage, both displays show same content, suggesting that the cloning configuration might be applied during this process. If possible may I know how we are able to see toradex easy install on both the displays at the same time?

I am reaching out to the community in the hopes of receiving guidance and insights regarding this issue. If anyone has successfully configured a dual HDMI display cloning setup on the VerdIn Toradex iMX8M Plus Dev Board,

Thanks,
Himanshu Bhavani

2

Hello Bhavani,

It seems like there’s an issue for that specific functionality in the version of Weston that NXP (and by extension us) ship.

Another customer applied a patch from upstream Weston that solves the issue and was kind enough to report the steps to us, please take a look: Apalis IMX8 HDMI and LVDS display not mirroring/cloning - #13 by HieuNong

Regards,