HDMI to VGA adapter has arrived.

[Giles Orr]

On 28 January 2014 19:40, William Muriithi <william.muriithi-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org>
wrote:
>
>
> > >
http://canada.newark.com/element14/piview/cable-assembly-hdmi-to-vga-adapter/dp/07W8937
> >
> > Just to expand on this a little, I bought the above adapter for use
> > with one of my Raspberry Pies. Having spent $35 on a computer, I
> > wasn't about to drop another $100+ plus on a new monitor, not when I
> > had a couple of 15" LCD VGA monitors available. Reading some of the
> > Raspberry Pi message boards turns up the fact that some of the HDMI to
> > VGA adapters don't get along with the Raspberry Pi (the adapters steal
> > power from the Pi, and some demand more power than the Pi can
> > supply...). Bottom line for me was that the "PI View" adapter was a
> > safe choice to allow me to re-use monitors with a Raspberry Pi... The
> > nice bit here being that these adapters will work in, as far as I
> > know, all HDMI to VGA situations.
>
> Okay, just realized my mistake and feel like an idiot. I bought this
cable the other day in order to watch online stuff on TV. The TV has HDMI
and the desktop only has VGA.
>
> Spent a while wondering why its not working.  Then today, took the cable
to work to test a hypothesis  as there is HDMI cable desktop there.  No
surprising, it do work if the source is HDMI driving the VGA. I haven't
hard luck the other way.
>
> Does this mean VGA can't drive HMDI or am I missing something? Any
solution around it?

As I understand it, converters going between VGA and HDMI (or DVI or
DisplayPort) have to be active, that is there's actually some electronics
in them because they're converting from an analog signal (VGA) to a digital
signal (HDMI, DVI, DisplayPort).  As such, most (all?) of these converters
only work in one direction.  There's probably someone on the list who can
explain it better, but I think that's the main problem.

I own two or three such converters: they work fine.

--
Giles
http://www.gilesorr.com/
gilesorr-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org
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