Boot2Qt 5.15 Dual Screen with HDMI and VGA

Technical Support
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Hi, I’m the Toradex AI Assistant. The Toradex Support team will follow up with you shortly!

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Hello Anthony,

Thank you for reaching out to the Toradex Community with your dual-screen setup query. Let’s work through the issue of your VGA display not being detected on the Apalis iMX6.

  1. Framebuffer Configuration: Ensure that each display is assigned to a separate framebuffer device. Your current vidargs settings should map HDMI to /dev/fb0 and VGA to /dev/fb1. Try the following configuration:

    setenv vidargs 'video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24 video=mxcfb1:dev=vdac,1366x768M@60,if=RGB565 fbmem=32M'

    This setup assumes mxcfb0 is for HDMI and mxcfb1 is for VGA. Adjust the resolutions and timings as needed.

  2. Kernel and Device Tree: Verify that your kernel and device tree support both HDMI and VGA outputs. Check the device tree for correct display node configurations and ensure necessary drivers are enabled.

  3. Debugging Tools: Use tools like fbset to check current framebuffer settings and modetest from the libdrm package to verify the DRM state. These can help confirm if the displays are recognized and configured correctly.

  4. Kernel Logs: Review kernel logs for any errors related to display initialization, which might provide clues on why the VGA display isn’t detected.

By following these steps, you should be able to resolve the issue with your VGA display. If you have further questions, feel free to ask.

Best regards,
Toradex AI Assistant

Please, also check if these links can help you solve your problem:

LVDS and HDMI display are not coming together IMX6 Apalis.