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Tue, 13 Jan 2026 03:05:15 +0000 Message-ID: <1e905400-da08-47e8-af6e-91c24e3166e4@intel.com> Date: Tue, 13 Jan 2026 05:05:13 +0200 User-Agent: Mozilla Thunderbird Subject: Re: [Intel-wired-lan] [REGRESSION] e1000e: RX stops after link down/up on Intel 8086:550a since v6.12.43 (fixed by suspend/resume) To: "Wenger Jeremie (EDU)" , "netdev@vger.kernel.org" CC: "anthony.l.nguyen@intel.com" , "przemyslaw.kitszel@intel.com" , "intel-wired-lan@lists.osuosl.org" , "linux-kernel@vger.kernel.org" References: Content-Language: en-US From: "Lifshits, Vitaly" In-Reply-To: Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TLZP290CA0002.ISRP290.PROD.OUTLOOK.COM (2603:1096:950:9::8) To IA3PR11MB9013.namprd11.prod.outlook.com (2603:10b6:208:57c::9) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: IA3PR11MB9013:EE_|DM4PR11MB6263:EE_ X-MS-Office365-Filtering-Correlation-Id: 206d5da7-2fcb-4073-845b-08de5250931d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; 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A system suspend/resume reliably restores RX. > > > Regression range: > > * > > Working: v6.12.22 > > * > > Broken: v6.12.43 .. v6.18.3 (tested on Debian 12 backports, Debian > 13, Debian sid). v6.18.3 is the most recent kernel tested so far, so > the regression is likely still present in newer kernels. > > Symptoms: > > * > > Link is detected (1Gbps, full duplex). > > * > > DHCP DISCOVER frames are transmitted (confirmed via external packet > capture). > > * > > No packets are received (no DHCP OFFER, RX appears dead). > > * > > Booting with the cable plugged works. > > * > > The issue is triggered only after unplugging and replugging the cable. > > * > > A suspend/resume cycle restores RX immediately. > > * > > Using a USB Ethernet adapter (r8152) on the same network works > correctly. > > Reproduction steps: > > 1. > > Boot with Ethernet cable plugged. > > 2. > > Verify network connectivity works. > > 3. > > Unplug the Ethernet cable. > > 4. > > Plug the Ethernet cable back in. > > 5. > > Observe that RX no longer works (no DHCP OFFER). > > 6. > > Suspend/resume the system → RX works again. > > This suggests that the PHY or RX path is not correctly reinitialized > on link up after a link down event, while the resume path performs a > more complete reset. > > > I can provide additional logs, ethtool statistics, or test patches if > needed. > > > > Best regards, > > > Jérémie Wenger > > Hi Jérémie, Your issue sounds very similar to the issues that were addresses in this commit: https://github.com/torvalds/linux/commit/3c7bf5af2196087f394f9099b53e37569636b259 Are you able to reproduce it over the latest kernel 6.19?