#7407 HIGH 9.1.0: Rotating the screen causes X lockup (xrandr broken)

[Zarro Boogs per Child]

#7407: Rotating the screen causes X lockup (xrandr broken)
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   Reporter:  erikg         |       Owner:  erikg                            
       Type:  defect        |      Status:  assigned                         
   Priority:  high          |   Milestone:  9.1.0                            
  Component:  not assigned  |     Version:  Development build as of this date
 Resolution:                |    Keywords:  8.2.0:?                          
Next_action:  never set     |    Verified:  0                                
  Blockedby:                |    Blocking:                                   
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Comment(by erikg):

 CosmicPenguin (per discussion in #xorg-devel) suggests that the problem is
 likely a loss of sync between the DCON and the GPU.

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Ticket URL: <http://dev.laptop.org/ticket/7407#comment:6>
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