[Spice-devel] [PATCH 1/2] [qxl.ko] stability for dual head: use surface_id 0 for primary surface on all monitors

[David Mansfield]

spice-server and downstream code expect that the primary surface will 
always have surface_id = 0.  In a dual head environment, all monitors 
render portions of the primary surface.

However, when the monitor config events are generated and sent, the 
primary surface (which has an internal id which is NEVER 0 once it is 
allocated), is only mapped to the correct identifier (0) for the primary 
head (where crtc index is 0).

The fix is to look at the "primary" flag in the bo and always use id 0, 
irrespective of which head is being configured.
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