My drivers injections works by selecting Profile = Nothing and settings the MDT variables DriverGroup001 and DriverGroup002 to the specific folders for the computer model.
This has worked perfectly with MDT2010 and MDT2012 but now with MDT2012 U1 this doesn't happen anymore. I have checked my variables and they are set correctly. I have checked the ZTIDrivers.log and it scans the correct folders but it discards the drivers. Funnily enough it injects only one driver: the SATA driver.
If I select the whole drivers folder structure in my profile selection (like Profile = Win7Drivers) then the drivers get injected but that defies the point a little. We have been told that the profile selection and the MDT variables DriverGroupxxx are additive. it looks like they are not anymore but then again why the SATA driver should work? This looks like a bug to me.