Re: 8756 G-Sync No Longer Works!
First, I can confirm that downgrading the driver to 8178 works as expected.
I have attached a zip file with two little test programs that illustrate what we are doing. glxb.C works without actually opening a window but tries to join the swap group and barrier using glx. The second program glxbarrier.C is started on the slaves as 'glxbarrier s' first. 'glxbarrier m f' is started on the master.
Will follow up with a debug report shortly.