feat(rpi4): add dummy HDMI to allow GPU acceleration for OpenGL rende…

…ring

project/yocto/build/conf/multiconfig/raspberrypi4-64.conf

@@ -21,6 +21,19 @@ RPI_EXTRA_CONFIG:append = 'gpu_mem=512\n'
 # See https://forums.raspberrypi.com/viewtopic.php?t=254640#p1564389
 RPI_EXTRA_CONFIG:append = 'config_hdmi_boost=4\n'
 
+#
+# Dummy HDMI to allow GPU acceleration for OpenGL rendering.
+# Credits to:
+#   - https://github.com/raspberrypi/Raspberry-Pi-OS-64bit/issues/225#issuecomment-1199414677
+#   - https://forums.raspberrypi.com/viewtopic.php?t=294588#p1778441
+RPI_EXTRA_CONFIG:append = 'framebuffer_width=1920 \n'
+RPI_EXTRA_CONFIG:append = 'framebuffer_height=1080 \n'
+RPI_EXTRA_CONFIG:append = 'hdmi_force_hotplug=1 \n'
+RPI_EXTRA_CONFIG:append = 'hdmi_group=2 \n'
+RPI_EXTRA_CONFIG:append = 'hdmi_mode=82 \n'
+RPI_EXTRA_CONFIG:append = 'hdmi_drive=2 \n'
+CMDLINE:append = " video=HDMI-A-1:1920x1080@60D"
+
 #
 # Required to build linux-firmware-rpidistro, but may carry a legal risk. See
 #   - https://meta-raspberrypi.readthedocs.io/en/latest/ipcompliance.html