OS pre-instaled CM12 Client, but it can not automatically find site after joining Domain

Question

Background:
we update sccm 2007 to sccm 2012 r2
For New PC, the OS pre-installed with our image by PC Vendor. The image has sccm 2012 client. So when users get the new pc, we only need to join the domain.
After joining the domain, 2012 client will never automatic locate the site code base on AD. 
I do some testing.
Install client in the domain pc with parameter SMSSITECODE=AUTO, the site code can be located
Install client in the workgroup pc firstly, the join the domain. Client will never automatic locate the site code base on AD
But If I  click Find Site in the Advanced tab of the Configuration Manager Properties in
the Control Panel. The site code can be located.

Answer 1

I'm going to guess you're running 2007 and 2012 side by side, in which case you need to look at your boundary groups.  In 2007 you simply had boundaries, in 2012 if you don't make boundary groups and assign boundaries and site site assignment to said
group nothing will happen.
If you have upgraded your infrastructure completely to 2012 but haven't upgraded all of your clients yet ... what you should be seeing is the opposite:  2007 clients wont check into 2012 unless you enable automatic client upgrade.  Then there's
if you have overlapping site codes between the two systems.
Better detail See:
https://technet.microsoft.com/en-us/library/gg682060.aspx
Assignment scenario
Assignment outcome
You have used automatic site assignment and your System Center 2012 Configuration Manager boundaries overlap with Configuration Manager 2007 boundaries.
The client automatically tries to find a System Center 2012 Configuration Manager site.
The client first checks Active Directory Domain Services and if it finds a System Center 2012 Configuration Manager site published, site assignment succeeds. If this is not successful
(for example, the System Center 2012 Configuration Manager sites is not published or the computer is a workgroup client), the client then checks for site information from its assigned management point.
Note
You can assign a management point to the client during client installation by using the Client.msi property SMSMP=<server_name>.
If both these methods fail, site assignment fails and you must manually assign the client.
You have assigned the System Center 2012 Configuration Manager client by using a specific site code rather than automatic site assignment, and mistakenly specified a site code for a Configuration
Manager 2007 site.
Site assignment fails and you must manually reassign the client to a System Center 2012 Configuration Manage