Re: Thunderbolt DP oddity on v5.2.9 on iMac 12,2

[Brad Campbell]

On 28/8/19 5:12 pm, Brad Campbell wrote:
> On 28/8/19 3:33 pm, Mika Westerberg wrote:

> > I'm suspecting that the boot firmware does configure second DP path also
> > and we either fail to discover it properly or the boot firmware fails to
> > set it up.
> >
> > Also if you boot with one monitor connected and then connect another
> > (when the system is up) does it work then?
>
> Umm.. so this is where it gets weird. No it doesn't. Apparently it fails 
> to configure the first monitor it finds. This is the one the Apple 
> bootcamp firmware configures at boot.

Ok just to clarify it appears I've been booting EFI and bypassing the 
Bootcamp BIOS emulation for a few years. So, that made no difference.