#1111011 RTL8125D - link drops

Package:
src:linux
Source:
src:linux
Submitter:
Lukasz Szotek
Date:
2026-01-24 12:47:01 UTC
Severity:
normal
Tags:
#1111011#5
Date:
2025-08-13 13:57:28 UTC
From:
To:
From linux-image-6.12.38+deb13-amd64 link drops every 18s on RTL8125D in ASUS NUC 14 Essential
Support for RTL8125D was added in 6.12.36.
Module from r8125-dkms works OK.
After r8169 blacklisted and r8125-dkms installed, link is stable.


2025-08-13T15:23:14.656760+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:23:16.360780+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:23:33.784797+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:23:35.428732+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:23:51.068792+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:23:52.784779+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:24:08.372776+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:24:10.036729+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:24:25.560787+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:24:27.308747+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:24:42.528745+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:24:44.352761+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:24:58.944910+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:25:00.576692+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:25:16.424717+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:25:18.056725+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:25:33.688767+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:25:35.332749+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:25:50.540730+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:25:52.184762+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-08-13T15:26:08.232691+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-08-13T15:26:09.888801+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx

00:00.0 Host bridge: Intel Corporation Alder Lake-N Processor Host Bridge/DRAM Registers
00:02.0 VGA compatible controller: Intel Corporation Alder Lake-N [Intel Graphics]
00:04.0 Signal processing controller: Intel Corporation Alder Lake Innovation Platform Framework Processor Participant
00:0a.0 Signal processing controller: Intel Corporation Platform Monitoring Technology (rev 01)
00:0d.0 USB controller: Intel Corporation Alder Lake-N Thunderbolt 4 USB Controller
00:12.0 Serial controller: Intel Corporation Device 54fc
00:14.0 USB controller: Intel Corporation Alder Lake-N PCH USB 3.2 xHCI Host Controller
00:14.2 RAM memory: Intel Corporation Alder Lake-N PCH Shared SRAM
00:16.0 Communication controller: Intel Corporation Alder Lake-N PCH HECI Controller
00:1c.0 PCI bridge: Intel Corporation Alder Lake-N PCI Express Root Port #7
00:1d.0 PCI bridge: Intel Corporation Alder Lake-N PCI Express Root Port #9
00:1f.0 ISA bridge: Intel Corporation Alder Lake-N PCH eSPI Controller
00:1f.3 Multimedia audio controller: Intel Corporation Alder Lake-N PCH High Definition Audio Controller
00:1f.4 SMBus: Intel Corporation Alder Lake-N SMBus
00:1f.5 Serial bus controller: Intel Corporation Alder Lake-N SPI (flash) Controller
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 0c)
02:00.0 Non-Volatile memory controller: Silicon Motion, Inc. SM2263EN/SM2263XT (DRAM-less) NVMe SSD Controllers (rev 03)
#1111011#18
Date:
2025-09-26 14:19:23 UTC
From:
To:
Upgrading kernel to 6.12.48 seems to solve the problem.

lsmod|grep 8169
r8169                 126976  0
mdio_devres            12288  1 r8169
libphy                233472  3 r8169,mdio_devres,realtek

uname -a
Linux player-101 6.12.48+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.48-1 (2025-09-20) x86_64 GNU/Linux

cat kern.log |grep r8169
2025-09-26T16:05:53.940936+02:00 player-101 kernel: r8169 0000:01:00.0: enabling device (0000 -> 0003)
2025-09-26T16:05:53.940940+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: RTL8125D, 48:21:0b:76:6b:98, XID 688, IRQ 124
2025-09-26T16:05:53.940946+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
2025-09-26T16:05:53.941317+02:00 player-101 kernel: Realtek Internal NBASE-T PHY r8169-0-100:00: attached PHY driver (mii_bus:phy_addr=r8169-0-100:00, irq=MAC)
2025-09-26T16:05:53.941318+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-26T16:05:53.941319+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
#1111011#23
Date:
2025-09-29 06:47:31 UTC
From:
To:

Nope, still problem:

2025-09-29T08:36:27.426059+02:00 player-101 kernel: r8169 0000:01:00.0: enabling device (0000 -> 0003)
2025-09-29T08:36:27.426059+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: RTL8125D, 48:21:0b:76:6b:98, XID 688, IRQ 129
2025-09-29T08:36:27.426060+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: jumbo features [frames: 9194 bytes, tx checksumming: ko]
2025-09-29T08:36:27.426300+02:00 player-101 kernel: Realtek Internal NBASE-T PHY r8169-0-100:00: attached PHY driver (mii_bus:phy_addr=r8169-0-100:00, irq=MAC)
2025-09-29T08:36:27.426300+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:36:27.426301+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:36:55.973274+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:36:57.637286+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:37:30.209105+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:37:31.841108+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:38:04.649145+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:38:06.301296+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:38:40.405163+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:38:42.089123+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:39:14.717289+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:39:16.369170+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:39:47.121275+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:39:48.753300+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:40:23.297165+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:40:24.949157+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:41:01.049301+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:41:02.701148+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:41:38.789296+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:41:40.441148+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:42:13.497142+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:42:15.245147+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:42:48.293298+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:42:49.933147+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:43:25.329306+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:43:26.993217+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:44:00.897107+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:44:02.553303+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2025-09-29T08:44:37.717303+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Down
2025-09-29T08:44:39.381228+02:00 player-101 kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
#1111011#28
Date:
2025-10-15 08:09:16 UTC
From:
To:
Tested kernels 6.15.3 and 6.17.2 too - same problem.
It has something to do with switch and/or 100Mbit vs 1Gbit:
- 1Gbit switch #3 - STABLE!!!
- 100Mbit switch #1 - drop every 90-130s
- 100Mbit switch #2 - drop every 27-28s


Linux Player1 6.15.3-porteus #1 SMP PREEMPT_DYNAMIC Sat Jun 21 15:39:51 MSK 2025 x86_64 Intel(R) N150 GenuineIntel GNU/Linux

Switch #1 10/100Mbit
[  176.299560] r8169 0000:01:00.0 eth0: Link is Down
[  178.550720] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  319.727536] r8169 0000:01:00.0 eth0: Link is Down
[  322.020380] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  453.172110] r8169 0000:01:00.0 eth0: Link is Down
[  455.433888] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  547.858732] r8169 0000:01:00.0 eth0: Link is Down
[  550.120187] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  665.213065] r8169 0000:01:00.0 eth0: Link is Down
[  667.506158] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  755.366130] r8169 0000:01:00.0 eth0: Link is Down
[  757.617201] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  843.657048] r8169 0000:01:00.0 eth0: Link is Down
[  845.908070] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  958.742485] r8169 0000:01:00.0 eth0: Link is Down
[  960.993661] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1194.437161] r8169 0000:01:00.0 eth0: Link is Down
[ 1196.688340] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1353.865078] r8169 0000:01:00.0 eth0: Link is Down
[ 1356.451773] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1460.464910] r8169 0000:01:00.0 eth0: Link is Down
[ 1462.779459] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1676.804066] r8169 0000:01:00.0 eth0: Link is Down

Switch #3 1Gbit
[ 1704.272719] r8169 0000:01:00.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx - STABLE!!!


Linux Player1 6.17.2-porteus #1 SMP PREEMPT_DYNAMIC Sun Oct 12 19:23:29 MSK 2025 x86_64 Intel(R) N150 GenuineIntel GNU/Linux

Switch #2 10/100Mbit
[   36.154817] r8169 0000:01:00.0 eth0: Link is Down
[   37.797355] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[   64.447691] r8169 0000:01:00.0 eth0: Link is Down
[   66.404836] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[   92.027583] r8169 0000:01:00.0 eth0: Link is Down
[   93.659714] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  119.041295] r8169 0000:01:00.0 eth0: Link is Down
[  120.683880] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
#1111011#33
Date:
2025-10-15 09:59:37 UTC
From:
To:
I think it's autoneg issue.
Setting 10Mbit with ethtool - STABLE
Setting 100Mbit autoneg off with ethtool - STABLE

[  110.456096] r8169 0000:01:00.0 eth0: Link is Down
[  112.759914] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  257.844982] r8169 0000:01:00.0 eth0: Link is Down
[  260.158785] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  390.411961] r8169 0000:01:00.0 eth0: Link is Down
[  392.694523] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  478.260037] r8169 0000:01:00.0 eth0: Link is Down <--- ethtool -s eth0 speed 10 duplex full
[  480.150471] r8169 0000:01:00.0 eth0: Link is Up - 10Mbps/Full - flow control rx/tx
[  776.238622] r8169 0000:01:00.0 eth0: Link is Down <--- ethtool -s eth0 speed 100 duplex full autoneg off
[  778.626019] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control off
[  782.796418] r8169 0000:01:00.0 eth0: Link is Down
[  784.959080] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control off
[  789.286490] r8169 0000:01:00.0 eth0: Link is Down
[  791.428393] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control off
#1111011#38
Date:
2025-10-22 14:59:00 UTC
From:
To:
Does

	ethtool --set-eee eth0 eee off

help operating the device at 1 Gbps?

Best regards
Uwe
#1111011#45
Date:
2025-10-31 07:57:15 UTC
From:
To:

Nope :(

[  285.841305] r8169 0000:01:00.0 eth0: Link is Down
[  287.494384] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  317.677989] r8169 0000:01:00.0 eth0: Link is Down
[  319.331009] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  348.969542] r8169 0000:01:00.0 eth0: Link is Down
[  350.622900] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx

[  381.489409] Ethtool ioctl interface doesn't support passing EEE linkmodes beyond bit 32 <-- ethtool --set-eee eth0 eee off

[  381.489565] r8169 0000:01:00.0 eth0: Link is Down
[  383.132844] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  414.061075] r8169 0000:01:00.0 eth0: Link is Down
[  415.714162] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  444.933290] r8169 0000:01:00.0 eth0: Link is Down
[  446.586387] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
#1111011#52
Date:
2025-11-15 10:43:04 UTC
From:
To:
Hi,

Right now I'm wondering if it might relate to
https://git.kernel.org/linus/bf7154ffb1c65a201906296a9d3eb22e9daa5ffc

If so you might want to try the 6.18 kernel in experimental. The
commit is as well included in the upcoming 6.17.8-1 upload to
unstable.

Regards,
Salvatore
#1111011#63
Date:
2026-01-21 15:12:15 UTC
From:
To:
Hi,


I've tried new Trixie kernel 6.12.63 included this change since 6.12.58, but same result:

Linux player 6.12.63+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.63-1 (2025-12-30) x86_64 GNU/Linux


2026-01-21T15:39:37.551400+01:00 player kernel: Realtek Internal NBASE-T PHY r8169-0-100:00: attached PHY driver (mii_bus:phy_addr=r8169-0-100:00, irq=MAC)
2026-01-21T15:39:37.551401+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:39:37.551401+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
...
2026-01-21T15:40:10.066878+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:40:11.718777+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2026-01-21T15:40:49.418726+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:40:51.074873+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2026-01-21T15:41:28.762656+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:41:30.418868+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2026-01-21T15:42:09.186729+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:42:10.842775+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2026-01-21T15:42:52.790746+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:42:54.454897+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
2026-01-21T15:43:38.642722+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Down
2026-01-21T15:43:40.298782+01:00 player kernel: r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
#1111011#70
Date:
2026-01-24 12:45:30 UTC
From:
To:
Control: tags -1 + moreinfo

Okay too bad. There was a second question in my email:

If so you might want to try the 6.18 kernel in experimental. The
commit is as well included in the upcoming 6.17.8-1 upload to
unstable.

Please test the most recent versions in unstable and experimental, so
we might get a picture if it can be reported upstream.

Regards,
Salvatore