#12582 HIGH Not Tri: XO-1.75 upgrade to 13.1.0 prevents further use with 12.1.0

[Zarro Boogs per Child]

#12582: XO-1.75 upgrade to 13.1.0 prevents further use with 12.1.0
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 Reporter:  Quozl   |                 Owner:                                   
     Type:  defect  |                Status:  new                              
 Priority:  high    |             Milestone:  Not Triaged                      
Component:  kernel  |               Version:  Development build as of this date
 Keywords:          |           Next_action:  never set                        
 Verified:  0       |   Deployment_affected:                                   
Blockedby:          |              Blocking:                                   
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 If an XO-1.75 is upgraded to 13.1.0, with consequent reflash of Open
 Firmware and EC firmware, and then downgraded to 12.1.0, then it can no
 longer boot 12.1.0.  A kernel panic occurs, with errors associated with
 eMMC.

 Cause appears to be the SD power change in EC 1.0.01 not working with the
 kernel in 12.1.0.

 Workaround is to downgrade Open Firmware and EC firmware to the versions
 that were previously present.

 http://wiki.laptop.org/go/Release_notes/13.1.0 does not mention this.

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Ticket URL: <http://dev.laptop.org/ticket/12582>
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