Openmoko Bug #2020: USB connection messes with suspend/resume state machine

[Openmoko Public Trac]

#2020: USB connection messes with suspend/resume state machine
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    Reporter:  vnevoa   |        Owner:  openmoko-devel
        Type:  defect   |       Status:  new           
    Priority:  normal   |    Milestone:                
   Component:  unknown  |      Version:  Om2008.8      
    Severity:  normal   |   Resolution:                
    Keywords:           |    Blockedby:                
Reproducible:  always   |     Blocking:                
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Comment(by vnevoa):

 I'm thinking this has little or nothing to do with USB.
 From the point of view of usage, USB plug-in and plug-out looks like just
 another APM event, like for example clicking the power button.

 New use-case info: (after opkg update + upgrade today = no pkg changes)
 1 - let FR go to sleep (without USB cable);
 2 - click power button -> FR wakes up, glows screen;
 3 - wait for timeout -> FR dims screen but does not go to sleep (icons
 still showing if strong light used);
 4 - touch screen -> FR glows screen;
 5 - wait for timeout -> FR dims screen and goes to sleep.

 This is consistent with the first description, but without the USB thing.

 Another interesting fact:
 1 - let FR go to sleep (without USB cable);
 2 - click power button -> FR wakes up, glows screen;
 3 - touch screen once -> nothing happens! (illume does not receive the
 click);
 4 - touch the screen again -> illume receives the click and acts normally
 (launch app, slide icons, etc.);
 However, after step 3 (touching the screen and nothing seems to happen)
 the timeout starts to count down, because if we don't do anything after
 that it effectively goes to sleep.

 My conclusion: when FR wakes up, there is "something X11" waiting for a
 click to initiate the power management countdown. If there is no screen
 tapping, there is no countdown to sleep (although there is countdown to
 screen dimming).

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2020#comment:5>
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