after two our father and a Hail Mary. the problem was solved.
Seriously, about an hour or so ago, I got an update package, inside it features cinnamon, hoping very high suddenly the button shutdown worked. both in kernel 4.14 and in 4.19.62.
The little problem lasted almost three weeks if I am not mistaken, I thought I would have it for life, but my faith in manjaro, specifically the cinnamon desk is restored.
If a similar problem occurs, I will try to wait a month before making the fuss. XD
Thanks to everyone, especially to
@bogdancovaciu, I don't know what it means, but it should mean goodwill.
@Sinister for providing me with the manual, and noting that my publication had a few more numbers.
to @SGS for telling me to edit my publication and so solve the numbers too.
to @datiswous for telling me to change the title of the publication.
to @rbrick49 for opening a discussion about data storage. I bet rbrick48 was in use hahahaha. XD