Blank screen when using a HDMI>VGA adapter with Pi

[Sevan / Venture37]

Hi,
Tonight I discovered that when I tried to use a HDMI to VGA (DB15)
adapter with to rev2 model B Raspberry Pi I'd get a blank screen.
I have access to 2 monitors, one has a HDMI port, one doesn't, so I
decided to do some testing.

HDMI > VGA adapter connected to both monitors results in a blank screen.
Connect directly via HDMI cable works fine.

The HDMI>VGA adapter works fine on both monitors if I switch from
FreeBSD-current to NetBSD 7.0 RC3 on the Pi.

Any pointers on what to try next on FreeBSD?

The adapter is labelled camac hdmi to vga, as pictured here
http://repairscomputer.co.uk/hdmi-to-vga-cable-adapter-for-pc-laptop-power-free-raspberry-pi-mhl-support

Regards,


Sevan / Venture37