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

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Message-ID: <de12662baa7219b4c8e376a9d571869675a9a631.camel@gmail.com>
Date: Wed, 19 Nov 2025 08:09:52 +1100
From: Jason Lethbridge <lethbridgejason@...il.com>
To: Heiner Kallweit <hkallweit1@...il.com>, nic_swsd@...ltek.com
Cc: netdev@...r.kernel.org
Subject: Re: Bug: Realtek 8127 disappears from PCI bus after shutdown


> - 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.

> - 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