netdev - Re: RTL8402 stops working after hibernate/resume

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Date:   Thu, 1 Oct 2020 08:14:48 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Petr Tesarik <ptesarik@...e.cz>
Cc:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        netdev@...r.kernel.org
Subject: Re: RTL8402 stops working after hibernate/resume

On 30.09.2020 23:44, Petr Tesarik wrote:
> On Wed, 30 Sep 2020 22:11:02 +0200
> Heiner Kallweit <hkallweit1@...il.com> wrote:
> 
>> On 30.09.2020 20:00, Petr Tesarik wrote:
>> [...]
>>> WoL still does not work on my laptop, but this might be an unrelated
>>> issue, and I can even imagine the BIOS is buggy in this regard.
>>>   
>> A simple further check you could do:
>> After sending the WoL packet (that doesn't wake the system) you wake
>> the system by e.g. a keystroke. Then check in /proc/interrupts for
>> a PCIe PME interrupt. If there's a PME interrupt, then the network
>> chip successfully detected the WoL packet, and it seems we have to
>> blame the BIOS.
> 
> Well, the switch does not sense carrier on the corresponding port while
> the laptop is suspended, so I'm pretty sure nothing gets delivered over
> that link. No, I suspect the ACPI suspend method turns off the RTL8208
> PHY chip, maybe as a side effect...
> 
Did you configure WoL explicitly, e.g. with ethtool -s <if> wol g ?

> But I don't need working WoL on this system - look, this is cheap old
> stuff that the previous owner considered electronic waste. I even
> suspect this was because wired network never worked well after resume.
> With your fix, this piece can still serve some purpose.
> 
Great, I will submit the fixes today.

> Thank you!
> 
> Petr T
> 
Heiner