For isochronous data steams processed by a computer system, for example high definition audio streams, embodiments keep track of the free space available in the input and output buffers for the data streams. The available free space in the buffers determines whether various low power entry and exit thresholds...http://www.google.com.au/patents/US7620833?utm_source=gb-gplus-sharePatent US7620833 - Power saving for isochronous data streams in a computer system
