dchapma1
Posts: 16
Joined: Sun Aug 05, 2012 12:54 am
Location: Upstate New York

Raspberry Pi 2 and Wake On LAN

Sat Mar 14, 2015 11:02 am

I rob ably already know the answer to this but I have not found and definitive answer concerning the Pi 2. So - does the new Raspberry Pi 2 support Wake On LAn. If not, is there a hack that can be done to get this all important feature working?

As powerful as the RPI is I cannot believe it does not support WOL.

Thanks,

Don

fruitoftheloom
Posts: 22022
Joined: Tue Mar 25, 2014 12:40 pm
Location: Delightful Dorset

Re: Raspberry Pi 2 and Wake On LAN

Sat Mar 14, 2015 11:07 am

dchapma1 wrote:I rob ably already know the answer to this but I have not found and definitive answer concerning the Pi 2. So - does the new Raspberry Pi 2 support Wake On LAn. If not, is there a hack that can be done to get this all important feature working?

As powerful as the RPI is I cannot believe it does not support WOL.

Thanks,

Don
The RPi2 B uses a combined USB/Ethernet Chipset on the USB Bus, same as the RPi1 B+, and WoL has not been implemented, nothing has changed since the original RPi1 B was released 3 years ago:

http://www.microchip.com/wwwproducts/De ... ct=LAN9514

http://www.raspberrypi.org/forums/viewt ... 28&t=95640


Hope you can believe that WoL is not supported ;)
Retired disgracefully.....
......to an uncomplicated life !

Rather than negativity think outside the box !

User avatar
DougieLawson
Posts: 37613
Joined: Sun Jun 16, 2013 11:19 pm
Location: Basingstoke, UK
Contact: Website Twitter

Re: Raspberry Pi 2 and Wake On LAN

Sat Mar 14, 2015 11:51 am

dchapma1 wrote: As powerful as the RPI is I cannot believe it does not support WOL.
Why do you need WoL when it costs pennies to run a Raspberry Pi 24/365.

At 5V 1000mA, that's 5W so for a year that 43.8kWh. 1kWh costs around £0.10 [1], so it's no more than £4.38 per year to run a RPi. Except that it doesn't draw anywhere near 1000mA most of the time.

[1] http://www.ukpower.co.uk/home_energy/ta ... r-unit-kwh in the Land of the Free your energy costs are lower.
Note: Having anything humorous in your signature is completely banned on this forum. Wear a tin-foil hat and you'll get a ban.

Any DMs sent on Twitter will be answered next month.

This is a doctor free zone.

orchard800
Posts: 2
Joined: Fri Apr 17, 2015 11:50 pm

Re: Raspberry Pi 2 and Wake On LAN

Fri Apr 17, 2015 11:55 pm

Why do you need WoL when it costs pennies to run a Raspberry Pi 24/365.
When you're running it on battery power in, say, a robot setup. WOL would be the obvious solution.

User avatar
mahjongg
Forum Moderator
Forum Moderator
Posts: 12663
Joined: Sun Mar 11, 2012 12:19 am
Location: South Holland, The Netherlands

Re: Raspberry Pi 2 and Wake On LAN

Sat Apr 18, 2015 12:03 am

why is WOL an obvious solution, it costs energy to keep a WOL system up, thats why WOL systems on PC's use about the same amount of energy when "waiting", as a PI uses running.
There is no lower power mode that keeps the PI running and the ethernet adapter powered, than letting it just run.
lower power can only be realized when you turn of both the CPU, and the LAN9512 chip.

orchard800
Posts: 2
Joined: Fri Apr 17, 2015 11:50 pm

Re: Raspberry Pi 2 and Wake On LAN

Sat Apr 18, 2015 2:36 pm

Fair enough. I assumed the board and processor would use less power when switched off but you make a good point. Thanks.

Tom_A
Posts: 272
Joined: Fri Dec 06, 2013 8:34 am

Re: Raspberry Pi 2 and Wake On LAN

Thu May 21, 2015 7:53 am

orchard800 wrote:Fair enough. I assumed the board and processor would use less power when switched off but you make a good point. Thanks.
You might be able to get a little lower power usage by setting lower minimum processor and gpu speeds in the config file, but I doubt you will get much.

texy
Forum Moderator
Forum Moderator
Posts: 5161
Joined: Sat Mar 03, 2012 10:59 am
Location: Berkshire, England

Re: Raspberry Pi 2 and Wake On LAN

Thu May 21, 2015 10:41 am

[SNIP]
Removed off topic posts.
Texy
Various male/female 40- and 26-way GPIO header for sale here ( IDEAL FOR YOUR PiZero ):
https://www.raspberrypi.org/forums/viewtopic.php?f=93&t=147682#p971555

User avatar
solar3000
Posts: 1051
Joined: Sat May 18, 2013 12:14 am

Re: Raspberry Pi 2 and Wake On LAN

Thu May 21, 2015 1:24 pm

the pi still uses 110mA when "off". So if you are running on battery, you need to have a physical off switch. or a relay or a solid state relay or a transistor.
Antikythera

User avatar
solar3000
Posts: 1051
Joined: Sat May 18, 2013 12:14 am

Re: Raspberry Pi 2 and Wake On LAN

Tue Jun 02, 2015 8:11 pm

actually there is a good reason for wanting WOL for RPi.
If there was a power outage it may not turn on (usually it starts up again).
Or if it was remotely shutdown.
Antikythera

Tom_A
Posts: 272
Joined: Fri Dec 06, 2013 8:34 am

Re: Raspberry Pi 2 and Wake On LAN

Thu Jun 04, 2015 2:59 am

solar3000 wrote:actually there is a good reason for wanting WOL for RPi.
If there was a power outage it may not turn on (usually it starts up again).
Or if it was remotely shutdown.
If there's a power failure and it doesn't come back up when the power comes back on then it's not likely it's going to work right until you have a close look at it. There's probably corruption to the file system that needs to be repaired or you might need to reinstall, hopefully from a back-up.

As far as shutting down goes, well... Don't do that! Not unless you really know you don't want it on until you have not so remote access to it.

I suppose if you had two with some sort of relay hats, you could use the relays to trigger a restart from the opposite Pi. :D
Here's the thing about WOL. It's "Wake On LAN." It doesn't work well or at all over WAN. Most if not all routers block it, so you need a machine that is local to the one you want to wake to send the WOL signal. There's a web interface for the Pi written to to exactly this (although it runs on any web server).

Return to “General discussion”