Don't use the iA button and start shooting, you're under utilizing the capability of the LX100. I suggest start shooting in Shutter priority (Set the Shutter to 1/60), then let the camera decide the Aperture and the ISO. Also, do custom white balance everything you change depth, or in my case, I do a custom white balance everything before I shoot.
Once you get comfortable, shoot in Manual mode. I have been shooting in Manual mode the whole time, and over time, I learn to decide what ISO to use. If you shoot in Manual mode, the ISO is not set by the camera, you have to set it yourself and this is where you can decide who much noise you can tolerate.