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Description of problem:
virt-manager can't add unix and pty  type channel to guest. virt-manager GUI only can add spicevmc channel.

Version-Release number of selected component (if applicable):
virt-manager-0.9.0-15.el6.x86_64 

How reproducible:
100% 

Steps to Reproduce:
1. Open virt-manager, make sure a good guest is in shutdown status

2. Open guest details page, Click Add Hardware - > Channel ,  There is only one item in Device Type combox  in Channel Device panel. 
  
Actual results:
virt-manager can't add unix and pty  type channel to guest


Expected results:
virt-manager can add unix and pty  type channel to guest.


Additional info:

Now the patch to fix this problem is merged into upstream tree.
(commit 419b34bb2e60c54d3258c01d9d05a288c47649f2)

the upstream commit 419b34bb2e60c54d3258c01d9d05a288c47649f2 is not enough to get this feature working in rhel-6.6.  Since it depends from other bits and that this is not a bug but a RFE, I am going to close it.