The regulations seem reasonable. They are limited to regulating the amount of power used while desktop systems are at idle, not while "in use". They take into account the potential for accessories to be added by the end user, the "Expandability Score". This means "bigger" computers can consume more power at idle. The CEC defines 4 idle states; short-idle, long-idle, sleep and off. Each state is well defined -
* Short Idle is system in S0 state, display on, no applications loaded or running, after a fresh re-boot.
* Long Idle is the same as Short Idle except the screen is off.
* Sleep is Power State S3 (or equivalent if the system doesn't directly implement S3).
The regulations also specify the required default timeouts for transitioning between idle states, e.g. the screen should be turned off after 10 minutes without user input, it should enter S3 after 15, etc. These don't apply if the system ships without an OS installed, they explicitly say that an end-user is free to change the defaults.