1. Apple Mac (OS X) laptops with native HDMI outputs
In this case, selecting the 'Laptop' input source results in the Vidyo display 'toggling' at a rate of ~0.5Hz - see:
Initial diagnosis with Ajenta and Edinburgh Learning Technology staff located this problem in the Extron HDMI switcher - bypassing the Extron and feeding the Mac's native HDMI output directly into the Vidyo HD-230 removed the fault. However, this is obviously not a sustainable solution.
Further investigation by Ajenta suggested disabling HDMI-CEC in the Vidyo HD-230: however, repeating the same test after this change failed to resolve the issue (further confirming the location of the problem in the Extron switchers):
2. Windows laptops with native HDMI outputsWindows laptops also presented specific faults; either the displayed output showed the bottom ~10% of the display as blank or 'wrapped-around' from the top of the machine's display; or the displayed output failed to display at the correct resolution - see:
Edinburgh already had relevant adaptors in stock and confirmed they resolved the reported issues as below
1. Mac Thunderbolt (Mini DisplayPort) to HDMI AdaptorEdinburgh have tested and confirmed that connecting the same Apple Mac to the Extron HDMI switcher via the HDMI (F) / Mini-DP (M) above reliable prevents the reported fault happening (at least, with Edinburgh's installation).