A very quick test (I’ll run with debug later this evening if I can).
The nr-1 image failed to initialize the CEC adapter. I then tried nr-2 and so far it has been 4 out of 4 successful reboots - some with TV already on and TV off.
I’ll stick with nr-2 for now - it looks good so far. Do you still want debug logs??
Again - many thanks for your time and effort!
Really? Didn’t expect that 
First 2 test images:
Here another test version n3!
It have added a hardcoded sleep of 30 seconds before the CEC adapter get initialized!
So please if nr 2 isn’t working try this test version!
Changes:
"hardcode" default bootloader CEC setting to 0x3f
Do not touch received messages if address is not enabled.
Added hardcoded sleep of 30s before adapter initialize
nr 2 still working 100% for the S905x2 x96 max 4g/32g box here. One good change I also noticed is that when I power off the S905x2 box now, the HDMI source switches automatically to the TV source (before your change it did not do that).
One question - and AFAIK it has always been this way with this kernel - If I power off the TV with the TV remote, the CE box also powers off (good - controlled by CEC settings in CE). If I then power on the TV with the TV remote, the CE box also powers on - with older versions of CE and LE, powering on the TV had no effect on the CE box. If I wanted to turn on the CE box and TV, I would use the power on the CE remote.
I could not find a setting in CEC in CoreELEC to control this - am I missing something here? I would not expect the CE box to power on if I use the TV remote power button - I would expect just the TV to power on.
Thank you very much for your efforts @all. Unfortunately, on an Odroid N2 --> Marantz AVR --> Philips TV even with 30 seconds delay: Could not initialise…
And nr 1 or nr 2?
N2 as well as N3 not working. N1 not tested so far. Is it worth it?
Please enable debug log in Kodi & enable the libCEC component too for logging!
Restart your N2 and after the pop up appeared open a SSH connection and enter:
cat /storage/.kodi/temp/kodi.log | paste
You will get a link to the uploaded debug log.
I have done another extra debug version:
If you get problem with the pop up (Couldn't initialize the CEC adapter) shown in Kodi please use this debug image. This update image is only to get a CEC debug log.
After update wait until you have seen the pop up in Kodi. Open a SSH connection and enter:
dmesg | grep cectx | paste
and post the resulting http link and a small description about the hardware setup.
Like box (N2) & AVR yes/no & TV brand.
Sorry for the delay. I fell asleep 
With the version you provided yesterday, “cat /storage/.kodi/temp/kodi.log | paste” brings
“dmesg | grep cectx | paste” brings
EDIT: Odroid N2 --> Marantz AVR --> Philips TV
Thx, I see the issue now!
It’s a CEC hardware issue of the SoC. As there is no register description available I don’t know how to fix it. I will take a look next week.
[ 14.517904@5] cectx ff80023c.aocec: hdmitx_cec_write: size: 1
[ 14.549776@4] cectx ff80023c.aocec: CEC tx msg len 1: f0
[ 14.553647@1] cectx ff80023c.aocec: warning:ARB_LOST
[ 14.554641@1] cectx ff80023c.aocec: warning:FOLLOWER
[ 14.765304@1] cectx ff80023c.aocec: CEC tx msg len 1: f0
[ 14.769439@1] cectx ff80023c.aocec: warning:ARB_LOST
[ 14.770198@1] cectx ff80023c.aocec: warning:FOLLOWER
[ 14.937027@4] cectx ff80023c.aocec: CEC tx msg len 1: f0
[ 14.940917@1] cectx ff80023c.aocec: warning:ARB_LOST
[ 14.940940@4] cectx ff80023c.aocec: hdmitx_cec_write: size: 1, ret 2
This log show a transfer (ping) of the box to the TV. But it fails after 3 unsuccessful attempt.
It fails by ARB_LOST. If no client (TV) is connected with node id 0x0 it should show a not acknowledge or an acknowledge if the TV is connected. But ARB_LOST shows a CEC bus problem.
@Portisch can your work on CEC be added to the Vim 3 builds? On my Panasonic tv I don’t get the CEC initialisation error but CEC doesn’t work as it should. When I change source to vim3 initially CEC doesn’t work but then normally after start playback it starts to work. If you would like me to test any build I would be happy to
Thanks
You just can test the tar on all Amlogic-ng devices 
But Panasonic is just strange and make problems everywhere with CEC.
There is some info around here in the forum, I guess it was: deactivate set to active source on kodi start in CEC options.
Ok Thanks I’ll give it a go! I tried deactivating active source it didn’t work. Strange thing is CEC worked perfectly on my old mecool s912 device with the same tv it’s only since I upgraded to the vim3 it’s broken
The ARB_LOST issue was treated in this thread a couple of month ago. As far as I can see this was somehow fixed, but the corresponding build is not available any longer.
It is no help, but i have the same Problem, too.
Philips TV, Denon x2600h, Odroid C2.
Mostly CEC not correspond with TV <> Odroid.
I have now done a measurement with my oscilloscope on the CEC bus of the N2.
This is the transfer protocol:
[ 20.833100@5] cectx ff80023c.aocec: try to send data by cec_ll_tx, len 1
[ 20.859895@4] cectx ff80023c.aocec: CEC tx msg len 1: f0
[ 20.889037@3] cectx ff80023c.aocec: try to send data by cec_ll_tx, len 2
[ 20.915905@5] cectx ff80023c.aocec: CEC tx msg len 2: f0 8c
[ 20.928535@1] cectx ff80023c.aocec: warning:ARB_LOST
The protocol shows the transfer of 0xf0 (ping TV) was successful.
The second transfer of 0xf0 0x8c fails by arbitration lost.
It just stop transfer after the third bit - I don’t know why.
The arbitration lost error happens randomly.
We got a hint from HK/Amlogic to remove a property in the dtb.
Maybe the CEC issue is fixed now!
CoreELEC-Amlogic-ng.arm-9.2-devel-1570018126.tar
Just update your device with this tar and have a test if the CEC issue Couldn't initialize the CEC adapter is solved!
Yes! Works on my Mecool KM9 Pro 
Was it working before, yes/no/sometimes?
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