[Trac #218] No way to power system down in software

[Zarro Boogs per Child]

#218: No way to power system down in software
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 Reporter:  dwmw2     |        Owner:  mfoster 
     Type:  defect    |       Status:  assigned
 Priority:  normal    |    Milestone:  BTest-1 
Component:  hardware  |   Resolution:          
 Keywords:            |  
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Comment (by ray.tseng at quantatw.com):

 The EC extended command 0x05is not suitable for system power down.
     The power off sequence is as following:
 1)EC sense power_button#
 2)EC send pwr_but#
 3)SB turn off main_on&sus_on
 4)EC sense main_on&sus_on OFF
 5)EC turn off Vr_on

     The system may program ACPI register PM1_CNT to ask SB turn off
 main_on&sus_on first.

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Ticket URL: <http://dev.laptop.org/ticket/218#comment:2>
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