1. Flash agl-demo-platfrom on AGL Reference Hardware.
2. Disable activate by default and enable two outputs in landscape oritentation, "/etc/xdg/weston/weston.ini":

[core]
...
activate-by-default=false

[output]
name=HDMI-A-1

[output]
name=HDMI-A-2

3. Configure homescreen to run on HDMI-A-1, "/etc/default/homescreen":

HOMESCREEN_START_SCREEN=HDMI-A-1

4. Reboot system.

5. Run weston-simple-egl

6. Run activation on HDMI-A-1 via separate application

activate_app(org.freedesktop.weston.simple-egl, NULL, HDMI-A-1)

or

activate_app(org.freedesktop.weston.simple-egl, NULL, HDMI-A-2)

Problem: both activate requests have no effect.

NOTE: Issue is not reproducible if homescreen will run on HDMI-A-1 (default).