i.MX8M Mini EVK + MIPI to HDMI : no HDMI Display with QT5

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i.MX8M Mini EVK + MIPI to HDMI : no HDMI Display with QT5

Contributor I



I'm using the NXP iMX8M Mini EVK (8MMINILPD4-EVK https://www.nxp.com/part/8MMINILPD4-EVK#/) connected to the NXP MIPI to HDMI adaptor card (IMX-MIPI-HDMI https://www.nxp.com/part/IMX-MIPI-HDMI#/) connected to an HDMI monitor (actually a DELL U2415) but I am unable to get the monitor to display anything (our main goal : using QT5 application), excepted during boot.

Software note : this is a Linux environment (not Android).

I've built a Yocto project based on "imx-yocto-L4.14.98_2.0.0_ga".

DISTRO=fsl-imx-xwayland MACHINE=imx8mmlpddr4evk source fsl-setup-release.sh -b build fsl-imx-xwayland

bitbake fsl-image-qt5-validation-imx


Linux version is 4.14.98 (the kernel "image" and the "rootfs" are the one generated by the Yocto project).

The associated "dtb" file comes from a "fsl-imx8mm-evk.dts" file.


The behavior is the following one :


1 - When booting the board : attached files "Boot on console.txt" and "dmesg.txt".

setenv displayinfo 'video=HDMI-A-1:720x480-32@60' has been added to the uboot environment.

The 4 penguins are successfully displayed on the HDMI monitor.

Then the image "openembedded" is successfully displayed on the HDMI monitor.

So, this STEP1 is working fine.


2 - Once the board is fully initialized, running "psplash" is also working fine : "openembedded" is successfully displayed.


3 - Trying QT5 examples (our main goal)

Running "analogclock" from /usr/share/qt5/examples/gui/analogclock :

Using the 'xdg-shell-v6' shell integration

Using Wayland-EGL

Nothing is displayed.


4 - Using "modetest" after stopping weston "systemctl stop weston"

modetest -M imx-drm -s 33@31:1920x1200

setting mode 1920x1200-60Hz@XR24 on connectors 33, crtc 31

Nothing is displayed

modetest -M imx-drm -s 33@31:720x480

setting mode 720x480-60Hz@XR24 on connectors 33, crtc 31

The SMPTE color bars test pattern is correctly displayed

QUESTION : Why QT5 example is not working ? Environment variables missing, Weston configuration issue, what has to be done ... To get this HDMI working fine ?


Any help with this would be greatly appreciated.



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NXP TechSupport
NXP TechSupport

I have mailed to you, pls find the reply

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