Here are some ideas to help you get the best from your putting when faced with patchy conditions:
Chip from off the Fringe
When greens are sanded or where the grass has been left unduly long, always chip rather than putt when on the fringe, especially when you are far from the hole.
Position the ball towards the back of your stance with your hands forward, and chip with an eight iron. It is easier to judge the distance with a low chip than trying to bang a long putt over a slow surface.
Retain a Positive Attitude
You can't play to your potential in any sport with a bad attitude. As soon as you let the adverse conditions get to you, you will follow a destructive spiral of complaining and losing your cool. This will undermine your ability and lessen any enjoyment of the game. Accept that things are not perfect and make the most of the situation. Alternatively don't play at all.
Lower Your Expectations
You should always give every putt due attention. However, when the roll of the ball is untrue, you should realise that each putt becomes somewhat of a lottery. Well-struck putts can bounce off-line or come up short. If your putt misses, forget about it. Just focus on the next putt.