Since removing ‘all-003-revert-reconnect-request.patch’ from libcec-osmc did not solve my problem, I compared several libcec commits regarding my problem (see above), my results:
3953f8d broken
d1a708b broken
67d444d compile error
e1df683 working
0a97062 working
For those of you who want to try if their problem is related to mine, you can try this package:
Commands (raspberry pi 2&3 only):
cd /tmp
wget http://pingumale.bplaced.net/rbp2-libcec-osmc.deb
sudo dpkg -i rbp2-libcec-osmc.deb
reboot
Based on libcec@e1df683
osmc@d3a6019
@sam_nazarko maybe you could revert to libcec@e1df683?