First of all, our iMX6Q board could be work properly under imx-yocto-L4.9.88_2.0.0 BSP by using X11 backend. However, I found a startup issue when I want to update BSP to imx-yocto-L5.15.5_1.0.0 which is your latest linux release BSP. BTW, I use the command "DISTRO=fsl-imx-wayland MACHINE=imx6qsabresd source imx-setup-release.sh -b build-wayland" to setup the enviroment, then use the command "bitbake imx-image-multimedia" to compile the Yocto system image. Unfortunately, we fount that the u-boot and kernel is startup noramlly and we could see the "penguin" logo and "openembedded" boot screen, but after that the weston destop could not be displayed properly which looks like "blurred screen".
The log and video are in the attachment.