No pressure sensitivity with touchscreen?

[helpme]

I have a lenovo ideapad flex. It comes with a touchscreen. I also have a lenovo active pen. I can draw with it on GIMP, but I can't get it to register pressure. Also, I tried to change my input devices settings, but I can't find an active pen in the menu. I think GIMP might think it's just the core pointer.

Does GIMP have support for this kind of device? It works with some other drawing applications that I've tried.