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<H1>[Mageia-dev] latest kernels not powering off machines on shutdown</H1>
<B>Colin Guthrie</B>
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TITLE="[Mageia-dev] latest kernels not powering off machines on shutdown">mageia at colin.guthr.ie
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<I>Thu Aug 9 21:25:23 CEST 2012</I>
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<PRE>'Twas brillig, and Thierry Vignaud at 09/08/12 19:29 did gyre and gimble:
><i> On 9 August 2012 20:18, Thierry Vignaud <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">thierry.vignaud at gmail.com</A>> wrote:
</I>>>><i> I've the impression that for some time, kernels do not power off machines
</I>>>><i> anymore on shutdown.
</I>>>><i> The kernel prints "System halted." but the machine remains powered.
</I>>>><i> I've seen that with VMs and with real PCs.
</I>>>><i>
</I>>>><i> Does someone else see that?
</I>>><i>
</I>>><i> Humm, in fact it looks like halt == shutdown -H now whereas in the
</I>>><i> old days it was equivalent to "shudown -P" (which still works OK).
</I>>><i>
</I>>><i> Since "halt" is now provided by systemd, this is were the regression
</I>>><i> come from...
</I>><i>
</I>><i> I would suggests sg like this in order to restore previous behaviour
</I>
This has already been reported and I've simply closed the bugs and said
that I will not fix this.
What is the point in having two commands if they both do the same thing?
I actually find the halt command useful for ensuring the correct thing
happens on shutdown (e.g. that we re-enter the initrd and pivot root out
of the main filesystem to ensure /usr us unmounted and LVM/raid etc.
properly tidied up). If you cannot issue a halt, it's nigh on impossible
to debug these things, so a patch to systemd would be IMO be a very bad
idea. I wouldn't necessarily be completely against a patch that made
running "halt" work differently to "systemctl halt", but such a patch
would likely be ugly and it's certainly not going to be accepted
upstream and it means inconsistent behaviour and as a result I'd rather
just let people adapt to the current (and IMO correct) behaviour - I
still maintain the old behaviour was broken and this that systemd simply
restores what the behaviour should have been all along.
Col
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Colin Guthrie
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