Ok, I'll do that now.<br />In the mean time I built a core-image-x11 for imx6qdlsabresd with following changes in local.conf:
<blockquote>
<div>DISTRO ?= "fslc-x11"</div>
<div>ACCEPT_FSL_EULA = "1"</div>
<div>IMX_DEFAULT_BSP = "nxp"</div>
<div>CORE_IMAGE_EXTRA_INSTALL += " \</div>
<div>&nbsp; &nbsp; packagegroup-fsl-gstreamer1.0-full \</div>
<div>"</div>
</blockquote>
With none of my own layers enabled, and the problem persists.<br /><br />
<blockquote>
<div>root@imx6qdlsabresd:~# uname -an</div>
<div>Linux imx6qdlsabresd 5.4.70+g2d1241e38347 #1 SMP PREEMPT Wed Oct 7 17:10:48 UTC 2020 armv7l GNU/Linux</div>
<div>root@imx6qdlsabresd:~# DISPLAY=:0 gst-launch-1.0 videotestsrc ! imxeglvivsink</div>
<div>Setting pipeline to PAUSED ...</div>
<div>Xlib:&nbsp; extension "XFree86-DRI" missing on display ":0".</div>
<div>Pipeline is PREROLLING ...</div>
<div>Xlib:&nbsp; extension "XFree86-DRI" missing on display ":0".</div>
<div>Xlib:&nbsp; extension "XFree86-DRI" missing on display ":0".</div>
<div>Pipeline is PREROLLED ...</div>
<div>Setting pipeline to PLAYING ...</div>
<div>New clock: GstSystemClock</div>
<div>Caught SIGSEGV</div>
<div>exec gdb failed: No such file or directory</div>
<div>Spinning.&nbsp; Please run 'gdb gst-launch-1.0 474' to continue debugging, Ctrl-C to quit, or Ctrl-\ to dump core.</div>
<div>&nbsp;</div>
</blockquote>