#11822 NORM 12.1.0: Add DisplayLink (USBVGA) support

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#11822: Add DisplayLink (USBVGA) support
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           Reporter:  martin.langhoff  |       Owner:  martin.langhoff
               Type:  enhancement      |      Status:  new            
           Priority:  normal           |   Milestone:  12.1.0         
          Component:  x window system  |     Version:  not specified  
         Resolution:                   |    Keywords:                 
        Next_action:  package          |    Verified:  0              
Deployment_affected:                   |   Blockedby:                 
           Blocking:                   |  
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Comment(by dsd):

 The driver may take a long time to load, but it seems to create the
 framebuffer device during its probe routine, so (with current kernel
 behaviour) you will have the device ready when modprobe returns (even if
 userspace has not yet created a /dev node). This is why looking for a /sys
 clue should work.

 You will probably still have to wait for the device node. But you'll know
 when you need to wait, since you'll be seeing something in /sys. I'd
 suggest using udevsettle to wait for the device.

 Running configure_xorg in the background would be racy, as systemd will
 not wait for it to finish before starting X.

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Ticket URL: <http://dev.laptop.org/ticket/11822#comment:6>
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