I also have an RPi 3B+ and did a fresh installation of v10.0.2. However, this latest version can not play x265 videos and even some x264 files. Later I gave up and downgrade to v9.2.8. I guess RPi 3B+'s hardware is just not powerful enough for v10.0.2. There are some other threads discussing about this already.
https://wiki.libreelec.tv/hardware/raspberry-pi#hevc-on-libreelec-9.x-10.x-11.x
JSON-RPC or kodi-send. Click!
I use several script calls in the Power Menu, and they often include kodi-send command, and everything works exactly as expected. There is no reason why something in the Power Menu should work differently than in other menus. The Power Menu is just like any other menu, the only thing that makes it "Power" is that it uses Kodi commands to control the status of Kodi and power status of the system.
Thanks for this! In that case it would help to see a log.
That's already part of my theory. I believe that all entries inside power menu will stop the kodi process.
Use other commands, like shutdown, poweroff or reboot.
PS: If you wish to interrupt the shutdown procedure, because a download is still active, you have to restart the kodi process.
Probably the kodi process gets terminated before your script content is called. So avoid kodi-send on this stage of shutdown.
You can try to copy & paste wget / busybox from Raspberry Pi OS (64 bit) to LE. There is some compatibility.
What are the odds of hdr being included for x86 by default in le11?
It's on the list, but the right guys currently have no time.
This time the log is fine. Your fake log was a link to the same thread. Probably just a glitch.
You can easily switch among LE 10+ versions (stable or nightly) by using the update folder method.
Just avoid updates from LE 9.x.x to LE 10+.
Buyers guide is a different story. Anyway, you made it. 
I mean Rpi4 and new sat decoder are connected both with hdmi...
So the wiring is:
TV -- HDMI -- sat decoder
TV -- HDMI -- RPi4
Maybe the new sat decoder sends a "stand-by" signal to RPi4 when going into its own stand-by.
Go to LE's input device settings, click on "CEC Adapter", and try to ignore external "stand-by" commands.
French keyboard:
Banana Pi M5 and Odroid C4 are supported by LE: Nightly Builds
Please wait for the comment of chewitt before buying. He knows about current state of development.
chewitt was answering. Both devices currently run best with CE. There is no clear winner. If you can't get an RPi4, pick one of those.
PS: If you only need 1080p, you can use LE nightly builds on both devices.
problem mounting disk on Raspy, and launching the "SD Card" update on the X99...
Please clarify those problems by opening new threads.
Banana Pi M5 and Odroid C4 are supported by LE: Nightly Builds
Please wait for the comment of chewitt before buying. He knows about current state of development.
Pinn could be an issue, so try singular LE installation on another microSD.
I still don't understand the complete HDMI wiring. Please clarify.
Thanks for support, would you open an issue on github?
It will be done by another team member.
It should work, if you adapt those instructions for USB usage.
