if you want your machine to autostart (i.e. resume after power loss) setpci is really handy. setpci is not part of libreelec but as far as i can see it just takes one line to modify in the source code to make libreelec come with setpci:
LibreELEC.tv/package.mk at master · LibreELEC/LibreELEC.tv · GitHub
line51: rm -rf $INSTALL/usr/sbin/setpci
so it gets removed during the build process.
i worked around this by compiling setpci on my own and call it via "autostart.sh" with "setpci -s 00:03.0 0x7b.b=19" to make my mac-mini autostart when i switch the power strip on my tv
maybe setpci could be useful for more people
