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05/01/2026, 2:32 PMgemma-4-31b
Today at 7:31 AM
To answer your question accurately, it is necessary to distinguish between the upstream Linux kernel (Mainline) and out-of-tree (Vendor) drivers.
The short answer is: Yes, the Realtek RTL8125 is supported in the Linux kernel, but the "patching" process has been a point of contention between the community and Realtek.
1. The Mainline Driver:r8169
The Linux kernel does not use a driver specifically named. Instead, ther8125driver is a unified driver designed to support a wide range of Realtek Gigabit Ethernet controllers, including the RTL8111, RTL8168, and the RTL8125.r8169
β’ Integration: The RTL8125 was integrated into thedriver in the mainline kernel.r8169
β’ The "Patching" Context: For several years, users reported stability issues, "link down" events, and poor performance with the mainlinedriver on RTL8125 hardware. This led to a fragmented ecosystem where users were encouraged to install a proprietary "patched" driver from Realtek's website.r8169
2. The Out-of-Tree Driver:r8125
Realtek provides a standalone driver (often referred to as thedriver) that is not part of the official Linux kernel source tree.r8125
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05/01/2026, 2:46 PM# SPDX-License-Identifier: GPL-2.0-only
################################################################################
#
# r8125 is the Linux device driver released for Realtek 2.5 Gigabit Ethernet
# controllers with PCI-Express interface.
#
# Copyright(c) 2025 Realtek Semiconductor Corp. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation; either version 2 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, see <<http://www.gnu.org/licenses/>>.
#
# Author:
# Realtek NIC software team <nicfae@realtek.com>
# No. 2, Innovation Road II, Hsinchu Science Park, Hsinchu 300, Taiwan
#
################################################################################
################################################################################
# This product is covered by one or more of the following patents:
# US6,570,884, US6,115,776, and US6,327,625.
################################################################################bland-article-62755
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