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Date:   Thu, 27 Aug 2020 13:46:31 +0200
From:   Rasmus Villemoes <>
To:     Heiner Kallweit <>,
        Network Development <>
Cc:     Lasse Klok Mikkelsen <>
Subject: Re: powering off phys on 'ip link set down'

On 27/08/2020 13.14, Heiner Kallweit wrote:
> On 27.08.2020 13:00, Rasmus Villemoes wrote:
>> On 27/08/2020 12.29, Heiner Kallweit wrote:
>>> On 27.08.2020 12:08, Rasmus Villemoes wrote:
>>>> Hi,
>>>> We have a requirement that when an interface is taken down
>>>> administratively, the phy should be powered off. That also works when
>>>> the interface has link when the 'ip link set down ...' is run. But if
>>>> there's no cable plugged in, the phy stays powered on (as can be seen
>>>> both using phytool, and from the fact that a peer gets carrier once a
>>>> cable is later plugged in).
>>>> Is this expected behaviour? Driver/device dependent? Can we do anything
>>>> to force the phy off?

> Maybe your question refers to something that was changed in 5.4 with
> the following commit:
> 95fb8bb3181b ("net: phy: force phy suspend when calling phy_stop")

This is a 4.19-rt kernel, and yes, cherry-picking that commit does make
things work as expected (and required). Thanks a lot, Heiner!


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