Re: [GTALUG] TIL: rtcwake / wakealarm

[Stewart C. Russell via talk]

On 2021-04-12 9:28 a.m., D. Hugh Redelmeier via talk wrote:
> 
> I always thought that shutting down a Pi really left it on.  That's one 
> reason some people like Pi power supplies with a switch.  To what 
> extent is that true?

It does: it just leaves the processor halted. So the other peripheral
chips are still drawing power.

> How much power is saved?  I delayed sending this message, hoping to add 
> information about this but I'm just not getting to the experiments.

Not much, but then, a Raspberry Pi doesn't draw much even running flat
out. There are fancy Raspberry Pi add-ons that provide a proper
logic-controlled shutdown and poweroff, but they typically cost about
the same as a Raspberry Pi, or about two year's energy cost for running
a Raspberry Pi 4B flat out.

cheers,
 Stewart
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[GTALUG] [GTALUG-Announce] Meeting Tomorrow

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# Windows subsystem for linux with Evan Leibovitch

After one too many times fighting with PulseAudio and video drivers and having
printers and scanners that will NEVER work with Linux, I gave up my dual boot
laptop and desktop and have loaded Win 10 on both.

Turns out, things run faster too, even open source apps like Handbrake which
take advantage of the GPU to do its video decoding while Linux can't do that.

But the story is not done. I installed Windows Subsystem for Linux and now have
a fully running Kubuntu as a VM when I want it. And there are some interesting
tools such as Windows Terminal in which you can have a Linux terminal shell
next to a tab with Windows PowerShell.

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Re: [GTALUG] TIL: rtcwake / wakealarm

[Lennart Sorensen via talk]

On Fri, Apr 09, 2021 at 10:23:10PM -0400, Stewart C. Russell via talk wrote:
> This may be old news to many of you, but today I learned you can have
> the computer's real time clock boot your machine at a specific time. The
> more proper way seems to be to use the 'rtcwake' command, but you can
> also do it by writing the timestamp of the startup time to
> /sys/class/rtc/rtc0/wakealarm
> 
> Some more details of the /sys method -
> https://www.raspberrypi.org/forums/viewtopic.php?f=63=309093=1849326=ca7a14f7d160f929378be4691b1aed9e#p1849291

Yes many PCs have had an option for the RTC to turn on the machine
(could even configure it in the BIOS to always turn on the computer at
a certain time for you).  I have never used it (I don't tend to turn
the computer off in the first place).

No idea how many other platforms support it although I suspect not very
many.  I didn't think the raspberry pi even had a concept of software
power control, which would make the RTC doing anything rather unlikely,
although if it is just sleeping that would be a different story.
Although suspend and sleep have often been rather hit or miss in my
experience.

-- 
Len Sorensen
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[GTALUG] DoorDash drivers game algorithm to increase pay - BNN Bloomberg

[Russell Reiter via talk]

As cyber awareness continues to permiate all layers of society, game theory
has a real world practicality for marginalized workers.

"Dashers" game "Tonys Casino". A tip is a UML construct, TIP To Insure
Prompt (service).

In the hospitality industry only the Maître d'hôtel received the tip in
advance. It was a handshake transfer, flying under the equitable doctrine
of "first come first served". It was done by wealthy people in order to
jump the que and get the best combination of table and server, while the
rest of the reservations lineup waited their turn.



https://www.bnnbloomberg.ca/businessweek/doordash-drivers-game-algorithm-to-increase-pay-1.1586591

Russell
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Re: [GTALUG] TIL: rtcwake / wakealarm

[D. Hugh Redelmeier via talk]

| From: Stewart C. Russell via talk 

| 
https://www.raspberrypi.org/forums/viewtopic.php?f=63=309093=1849326=ca7a14f7d160f929378be4691b1aed9e#p1849291

Intereresting.  Thanks.

I always thought that shutting down a Pi really left it on.  That's one 
reason some people like Pi power supplies with a switch.  To what 
extent is that true?

How much power is saved?  I delayed sending this message, hoping to add 
information about this but I'm just not getting to the experiments.

Most PCs seem to have a firmware (BIOS) setting for when to wake up.  
I've never thought that useful since it required shutting the OS down and 
going into the firmware setup menu.

The rtcwake(8) command was explored by Giles on a PC.  It's available on 
my desktop.  The manpage refers to nvram-wakeup, but I don't see that on 
my system (fedora).  It seems to be part of debian.

There are a lot of things under /sys/class/rtc/rtc0 on my desktop.  I 
haven't searched for any documentation that might exist.

On a related topic:

Windows PCs seem to enter sleep mode when they haven't done anything for  
a certain amount of time.

My Linux boxes don't, as far as I've noticed.

Except for one Dell desktop box supplied with Ubuntu.  It does this too.

How does one configure conventional Linux to do this?

(I could probably spelunk systemd on that Dell system to see what's going 
on but I fear entering a Labyrinth and never coming out.)

Oh:

systemd-hibernate-resume (8) - Resume from hibernation
systemd-hibernate-resume-generator (8) - Unit generator for resume= kernel 
parameter
systemd-hibernate-resume@.service (8) - Resume from hibernation
systemd-hibernate.service (8) - System sleep state logic
systemd-suspend-then-hibernate.service (8) - System sleep state logic
systemd-sleep.conf (5) - Suspend and hibernation configuration file
systemd-suspend-then-hibernate.service (8) - System sleep state logic
systemd-suspend.service (8) - System sleep state logic

I haven't read these yet or looked for an over-arching document.
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