Below are my queries. Thanks in advance.

1) Can QNX screen based application send 2 updating layers in single async commit cycle?

OR its expected that only a cursor kind of layer will be marked for async commit, when all other layer in same commit 
cycle are non-updating.

2) Is it ideally expected that only a single layer will be updating in case of async commit? 
 
Note: We are trying to handle "sw-vsync -interval=0"  in WFD driver