#10568 LOW 11.2.0-: XO-1 graphical boot hangs if SISUSB VGA adapter attached

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#10568: XO-1 graphical boot hangs if SISUSB VGA adapter attached
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           Reporter:  greenfeld    |       Owner:  dsd                               
               Type:  defect       |      Status:  new                               
           Priority:  low          |   Milestone:  11.2.0-M4                         
          Component:  initscripts  |     Version:  Development source as of this date
         Resolution:               |    Keywords:                                    
        Next_action:  diagnose     |    Verified:  0                                 
Deployment_affected:               |   Blockedby:                                    
           Blocking:               |  
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Comment(by dsd):

 The libertas messages always appear and are unrelated.

 The logs don't provide as much info as I was hoping for. A few things to
 look at for further diagnosis:

  1. Do any other sisusb messages usually appear after "Allocated 8
 buffers"?
  2. Can you get a sysrq task dump at the point of hang?
  3. See if you can reproduce it as follows: move the sisusbvga.ko file to
 somewhere where modprobe can't find it, boot the system and stop X. Then
 run a loop at the shell of insmod;rmmod, see if that makes it possible to
 reproduce the hang quickly

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Ticket URL: <http://dev.laptop.org/ticket/10568#comment:9>
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