Re: [9fans] RaspberryPi, monitor energy saving

[Shane Morris <edgecomberts@gmail.com>]

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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?!
>>
>>
>

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