Yeah, I was kind of the mentality of "Well, if its HDMi, its basically single link DVI..." Of course, it is its own standard, CEC is probably the simplest way of achieving this, there is a CEC-serial bridge, various websites have them. I've looked into them before, before I started using all Macs because of my job. The old Pi sees little use these days =(

The thing with the CEC-serial bridge is, do I spend $x on this device, to save $y worth of power over z period of time, and at the end of the day, am I making an acceptable ROI? YMMV. I just had this same debate with a bloke from the Czech Republic about the Australian Government incentive scheme for household solar panels, and no energy storage facilities. Again, YMMV.


On Fri, May 16, 2014 at 6:45 PM, Steve Simon <steve@quintile.net> wrote:
i believe that this works for vga attached monitors, vesa says that when the clocks
disappear on the sync the monitor should shutdown.

the raspberry pi uses hdmi and also it doesn't use a vesa bios, it has a gpu bios
which does a similar job but is not standardised, and, though it is documented,
it can be tough to use (for me at least).

i am happy to be contradicted on any of this of couse.

-Steve




On 16 May 2014, at 04:53, Shane Morris <edgecomberts@gmail.com> wrote:

This might be wildly off the mark, but is there something VESA related to do this, VGA monitors, et al?

I prepare to stand flamed. ^.^


On Fri, May 16, 2014 at 8:26 AM, Bakul Shah <bakul@bitblocks.com> wrote:
On Thu, 15 May 2014 22:04:34 BST "Steve Simon" <steve@quintile.net> wrote:
> Its just wonderful to have a raspberry pi as a plan9 terminal,
> but the energy saving of the pi is outweighed by the monitor I use.
>
> The Pi's display code blanks the screen after a while but this does
> not shutdown the monitor.
>
> I dug a little and it seems I need to send CEC (Consumer Electronics Control)
> messages over HDMI - Via a Pi GPU entrypoint.
>
>
> Porting libcec looks a little painful especially as I only need to be able
> to send two messages (turn on and turn off).
>
> Anyone know anything about this stuff? is CEC what I need or is there some
> other (simpler) way?

May be use a gpio pin to control a switch?!