#4479 HIGH Update.: DCON corruption during suspend/resume

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#4479: DCON corruption during suspend/resume
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  Reporter:  wad     |       Owner:  dilinger
      Type:  defect  |      Status:  new     
  Priority:  high    |   Milestone:  Update.1
 Component:  kernel  |     Version:          
Resolution:          |    Keywords:  DCON    
  Verified:  0       |  
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Comment(by wad):

 There are two problems here.  One is a hardware problem in which the DCON
 does not respond to the I2C reset sequence recommended by Himax, requiring
 a power cycle.  The second is that when the chip is power cycled, it isn't
 being reset to the same state that OFW places it in on first boot.

 I've searched through the logs generated on the testbed (these laptops
 don't have displays attached), and we are seeing I2C resets on all 40
 machines.   Around six to eight of these showed the problem described
 above (it is difficult to determine the exact number as logs are not
 strongly tied to one machine.)

 We will continue to look for hardware problems causing the failure of the
 I2C reset, but we need to get the power cycling of the DCON to reliably
 reset it to a working state.

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Ticket URL: <https://dev.laptop.org/ticket/4479#comment:3>
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