I tested with 3.13.0-158-generic (from proposed updates) and the problem persists, like for 13.0-157-generic . It does not happen with 3.13.0-155.
I tested with 3.13.0-158-generic (from proposed updates) and the problem persists, like for 13.0-157-generic .
It does not happen with 3.13.0-155.