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

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Message-ID: <6411b990f83316909a2b250bb3372596d7523ebb.camel@gmail.com>
Date: Wed, 19 Nov 2025 04:07:16 +1100
From: Jason Lethbridge <lethbridgejason@...il.com>
To: nic_swsd@...ltek.com, hkallweit1@...il.com
Cc: netdev@...r.kernel.org
Subject: Bug: Realtek 8127 disappears from PCI bus after shutdown

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.

- 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

Download attachment "config.gz" of type "application/gzip" (58768 bytes)

Download attachment "dmesg.gz" of type "application/gzip" (25489 bytes)

Download attachment "lspci.gz" of type "application/gzip" (9474 bytes)