Well, the title is pretty self explanatory. I have acpid and tlp running.
In Mate and Gnome there is an option to disable the standard behaviour of suspending when the lid is closed. I have set those options in Mate and in Gnome to do nothing in AC power, but it does not work with either of them. The reason I want this behaviour is because I have an external monitor which is much nicer for me to use, so there is no need for me to have the lid open, leaving me with extra space on the table.
Another quirk is that when the lid is closed and opened afterwards, neither Gnome nor Mate lock the computer, the computer can be used without a password right away, which is also not desired and most likely related to the issue.
Maybe tlp is interfering with this option, though I doubt of that possibility, since it works great with another linux I have installed in the same computer.
Any ideas or output I should provide will be given. Many thanks in advance.