Place dried mushrooms in a medium bowl and add warm water. Let them sit for 30 minutes. Remove the mushrooms from the liquid and finely chop them. Reserve the soaking liquid.
Cut the fresh mushrooms into even pieces. Finely chop the onion. Warm oil in a large frying pan, and add onion. Cook onion until it has softened. Add raw mushrooms and soaked mushrooms and cook for 5-7 minutes.
Finely chop bacon. Heat up a separate pan and add bacon pieces. Fry for 4-5minutes or until the bacon has browned and crisped up.
Peel and cube potatoes. Pour water in a medium pot on medium-high heat. Add potatoes. Bring the pot to aboil, and simmer for 5 minutes. Add onion and mushroom mixture. Simmer for 5 minutes or until potatoes are soft. Add cream, and bring soup to a boil. Add cooked bacon. Remove from heat and serve.