netdev - Re: Bug: Realtek 8127 disappears from PCI bus after shutdown

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Message-ID: <cc1c8d30-fda0-4d3d-ad61-3ff932ef0222@gmail.com>
Date: Tue, 18 Nov 2025 22:43:10 +0100
From: Heiner Kallweit <hkallweit1@...il.com>
To: Jason Lethbridge <lethbridgejason@...il.com>, nic_swsd@...ltek.com
Cc: netdev@...r.kernel.org
Subject: Re: Bug: Realtek 8127 disappears from PCI bus after shutdown

On 11/18/2025 10:09 PM, Jason Lethbridge wrote:
> 
>> - How is it after a suspend-to-ram / resume cycle?
> This machine is having trouble resuming from suspend-to-ram. I doubt
> that it's a problem relating to r8169 however since suspend-to-ram
> doesn't work properly even with r8169 blacklisted.
> 
>> - Does enabling Wake-on-LAN work around the issue?
> r8169 behaves the same regardless of if Wake-on-LAN is enable or
> disabled in UEFI.
> 
Thanks for the feedback. Enabling WoL in UEFI isn't sufficient.
It has to be enabled also on the chip:

ethtool -s <if-name> wol g


>> - Issue also occurs with r8127 vendor driver?
> The "10G Ethernet LINUX driver r8127 for kernel up to 6.15 11.015.00"
> from 'https://www.realtek.com/Download/List?cate_id=584' builds and
> runs flawlessly on 6.17.8. The issue is not occurring when the NICs are
> driven by the r8127 module.
> 
> Drivers SHA-256:
> ab21bf69368fb9de7f591b2e81cf1a815988bbf086ecbf41af7de9787b10594b 
> r8127-11.015.00.tar.bz2
> 
> On Tue, 2025-11-18 at 20:49 +0100, Heiner Kallweit wrote:
>> On 11/18/2025 6:07 PM, Jason Lethbridge wrote:
>>> Hi all,
>>>
>>> I’m reporting a reproducible issue with the r8169 driver on kernel
>>> 6.17.8.
>>>
>>> I recently got a Minisform MS-S1 which has two RTL8127 NICs built
>>> in.
>>> The r8169 driver works perfectly well with these on kernel 6.17.8
>>> until
>>> the device is powered off.
>>>
>>> If the device has not been disconnected from wall power then the
>>> next
>>> time it's turned on both NICs appear to stay powered down. There's
>>> no
>>> LED illuminated on the NIC or the switch they're connected to nor
>>> are
>>> they listed by lspci. The only way to recover the NICs from this
>>> state
>>> is to disconnect the power then plug it back in.
>>>
>> - How is it after a suspend-to-ram / resume cycle?
>> - Does enabling Wake-on-LAN work around the issue?
>> - Issue also occurs with r8127 vendor driver?
>>
>>> - The bug occurs after graceful shutdown
>>> - The bug occurs after holding the power button to force off
>>> - The bug occurs even if `modprobe -r r8169` is run before shutdown
>>> - The bug does NOT occur when Linux is rebooting the machine
>>> - The bug does NOT occur when the r8169 module is blacklisted
>>> - The bug is indifferent to either NIC being connected or not
>>> - The bug is indifferent to CONFIG_R8169 being in-built or a module
>>> - The bug is indifferent to CONFIG_R8169_LEDS being set on or off
>>>
>>> Attachments include `dmesg`, `lspci -vvv`, and `/proc/config.gz`
>>> from
>>> the system exhibiting the bug.
>>>
>>> I'll be happy to try any patches if that helps.
>>>
>>> Thanks
>>> -Jason