Table 9-2 System Power-State Definitions
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<tr><td><strong>State</strong></td><td><strong> Power Consumption </strong></td><td><strong>Software Resumption </strong></td><td><strong>Hardware Latency</strong></td></tr> 
<tr><td>S0 (fully on) </td><td>Maximum </td><td>Not applicable </td><td>None </td></tr>
<tr><td>S1 (sleeping) </td><td>Less than S0, more than S2 </td><td>System resumes where it left off (returns to S0) </td><td>Less than 2 seconds </td></tr>
<tr><td>S2 (sleeping) </td><td>Less than S1, more than S3 </td><td>System resumes where it left off (returns to S0) </td><td>2 or more seconds </td></tr>
<tr><td>S3 (sleeping) </td><td>Less than S2; processor is off </td><td>System resumes where it left off (returns to S0) </td><td>Same as S2 </td></tr>
<tr><td>S4 (hibernating) </td><td>Trickle current to power button and wake circuitry </td><td>System restarts from saved hibernate file and resumes where it left off prior to hibernation (returns to S0) </td><td>Long and undefined </td></tr>
<tr><td>S5 (fully off) </td><td>Trickle current to power button </td><td>System boot </td><td>Long and undefined</td></tr> 
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