Modesetting can't switch back from a software to a hardware cursor (patch to follow)

[Michael Thayer]

At present if modesetting ever fails to set a hardware cursor it 
switches back to a software one and stays that way until it is unloaded. 
  The following patch should fix that.  I say "should" because I had 
difficulties testing it - the cursor simply disappeared when it should 
have been rendering in software, though the debugger showed that 
pixman_image_composite() was getting called whenever the cursor moved, 
and my kernel driver was getting dirty rectangle information.  My 
feeling is that the patch is correct and something else is broken.  I 
have not investigated in depth in case some one else immediately has an 
idea.

Note that I did my testing against Ubuntu's 1.17.2 server.

Regards,

Michael
-- 
Michael Thayer | VirtualBox engineer
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