Comment 169 for bug 987220

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Andre (ajx) wrote : Re: System does not power off reliably when "Shut Down" chosen from GUI

I cannot concure on the conclusion that it is related to closed-source drivers exclusively. I have the problem on 2 machines with Intel graphics, and not a single proprietary driver installed. They only shut down completely and switch the power off in 50% of the shutdown attempts. In general all my machines (I oversee more than the two which won't switch the power off) take ages to shutdown since Precise. I recenlty upgraded one machine to Quantal: it does shut down, but I can basically get a coffee until it finaly powers off. Up to Oneiric everything was fine: quick shutdown, and relyable poweroff.

Although this bug is declared "fixed", none of the above "fixes" have had any impact on the weird behavior at shutdown.