> Yep, that is my experience as well. Back in the day, one needed to install
> software on the OS to process those notifications. I believe [hope] some
> of those are built-ins based on standards.
>
> I know for sure that Ubuntu still has apcupsd in the repositories (and
> still installed from my previous UPS) to support some? APC UPS devices and
> powstatd for some Cyberpower units, one TrippLite model and "various older
> APC units". There is also nut ("Network UPS Tools (NUT) is a client/server
> monitoring system that allows computers to share uninterruptible power
> supply (UPS) and power distribution unit (PDU) hardware. ").
>
> On Wed, Dec 21, 2011 at 11:17 AM, Kevin Fries <
kevin@fries-biro.com> wrote:
>
> > At least in any commercial operation I have worked in, this is the way
> > that it worked:
> >
> > * power comes in from the wall to the unit
> > * the unit then supplies power to the computer via the battery
> >
> > This way, when there is a power failure, there is no loss of power to
> > the device. Generally most UPS units I have worked with, have protected
> > and unprotected ports. Therefore, if anything is plugged into the
> > unprotected ports, those devices will simply shut down on power loss.
> >
> > On loss of power from the wall, power is continued to be supplied to the
> > protected devices until the battery power level drops below some value.
> > On higher end units, this value is configurable, on cheaper units, it is
> > prefixed at time of manufacture. Once the power level drops to the
> > critical level, it will then signal the protected device that its
> > shutdown is eminent, allowing the software to begin an orderly shutdown
> > of its own.
> >
> > I have even seen some high end units, have a two level protection, where
> > it will first signal that it is on battery allowing for dropping of cpu
> > power levels, dimming displays, and stuff like that. It does that in an
> > attempt to extend the battery life as long as possible.
> >
> > Only on the cheapest of units should a UPS begin an immediate shutdown,
> > and that is because it does not have the AMPs to last very long, so any
> > loss of wall power puts the unit into a critical configuration
> > immediately.
> >
> > Hope that helps
> > Kevin Fries
> >
> >
> >
> > On Wed, 2011-12-21 at 11:03 -0700, Dazed_75 wrote:
> > >
> > >
> > > On Wed, Dec 21, 2011 at 10:47 AM, Lyle Tuttle <
l.tuttle@cox.net>
> > > wrote:
> > > At 10:36 AM 12/21/2011, Dazed_75 wrote:
> > > > The manufacturer states rather strongly that unplugging the
> > > > UPS is a BAD way to test it since that also removes the
> > > > ground circuit. So far, my best idea is to go out to the
> > > > electrical box and flip the relevant circuit breaker off.
> > > >
> > > > The point though, is even that only tests the UPS. I would
> > > > need to leave it off long enough for the UPS to request (via
> > > > that USB cable) that the computer do an orderly shutdown
> > > > which could take 30 minutes or more.
> > >
> > >
> > > Whoa!
> > >
> > > My understanding is that when a power failure occurs, the UPS
> > > takes over supplying power immediately - and also signals the
> > > system to shut down in an orderly fashion....the 30 minutes
> > > you mention, IMHO, deals with the amount of time the UPS would
> > > run the system if it did not shut down
> > >
> > > Good point although I don't think it should immediately tell the
> > > computer to shut down either. What the manual says is "can connect
> > > your UPS to a computer in order to automatically save open files and
> > > shut down the computer if it is left unattended during an extended
> > > power failure" (emphasis added). This makes me think the notification
> > > would be issued by the UPS after battery power dropped to some level
> > > or estimated time remaining since the OS would have no clue how much
> > > battery time remained.
> > >
> > > - on my system, by utilizing various power outlets on the UPS,
> > > I can somewhat control WHAT components shut down right away.
> > >
> > > What if you plug the UPS into a switchable power strip - then
> > > turn it off?
> > >
> > >
> > > Another good point, that should retain the ground connection. Eric
> > > made the same suggestion.
> > >
> > >
> > > > And worse, I would not know if a non-event meant a failure
> > > > on the part of the UPS signaling system or the Linux side
> > > > not making use of the signal event since I still have no
> > > > idea what to check for.
> > > >
> > > > I bring all this up because my last UPS failed to protect
> > > > the computer so now I am paranoid about it.
> > > >
> > > > On Wed, Dec 21, 2011 at 8:27 AM, Alex Dean
> > > > <
alex@crackpot.org> wrote:
> > > >
> > > >
> > > >
> > > > On Dec 21, 2011, at 2:06 AM, Dazed_75 wrote:
> > > >
> > > > > I just put in a replacement UPS (Tripp-Lite
> > > > G1010USB) and connected the USB cable. I see that
> > > > Ubuntu 10.04 does see it but I have no idea how to
> > > > tell if it will actually pay attention if the UPS
> > > > ever tells it to shut down. Short of a power
> > > > failure, how can one know?
> > > >
> > > > Unplug the UPS from the wall?
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> > > >
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>
>
> --
> Dazed_75 a.k.a. Larry
>
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