  We study shot noise for generic quantum dots coupled to two leads and allow
for an arbitrary strength of diffractive impurity scattering inside the dots.
The ballistic quantum dots possess a mixed classical phase space, where regular
and chaotic regions coexist. In absence of disorder, the noise is
systematically suppressed below the universal value of fully chaotic systems,
by an amount which varies with the positions of the leads. This suppression is
due to the deterministic nature of transport through regular regions and along
short chaotic trajectories, and disappears by increasing the scattering rate,
which is incorporated by using the Poisson kernel of random matrix theory.
