In most cases a dryer will usually discharge the lint along with the steamy air. The filter is just there to catch any errant lint and prevent it from re-depositing on the load. The usual fault lies in the length and type of vent you have on the dryer. This involves the number of 90 degree bends, duct material and overall length. You will find the specifications for LG dryers in the service manual for one of the other models in the front of this forum, so download the manual and find this info in the first few pages.
Remember not to use foil or vinyl hose to the wall outlet! I have some venting tips here.