DX Trace Option is not working on Win 8 9200 x64 OS

Question

I've tried using log.cmd from Windows kits\8.0\Windows Performance ToolKit\gpuview to log DX events on 64bit Win8 9200 build.

The DX.etl trace does not log any DX events. It only has D3D9 Present events.

When I ran the same DX trace in Win7, it is working fine  and many DX events are logged (esp events from video miniport driver)

I've also tried xperf -start DxLogger -on DX -f sample.etl from elevated command prompt in Win 8  64 bit OS but still nothing is logging in sample.etl, but If I use the same command in Win 7, it is working fine and I'm getting data in sample.etl

I'm not able to find any pointers about this anywhere and I need urgent help on this. This has blocked my tool which was working fine on win 7 but stopped working on win 8.

Any suggestions?

Thanks,

MShaikh