netdev - Re: [Intel-wired-lan] [REGRESSION] e1000e: RX stops after link down/up on Intel 8086:550a since v6.12.43 (fixed by suspend/resume)

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Message-ID: <1e905400-da08-47e8-af6e-91c24e3166e4@intel.com>
Date: Tue, 13 Jan 2026 05:05:13 +0200
From: "Lifshits, Vitaly" <vitaly.lifshits@...el.com>
To: "Wenger Jeremie (EDU)" <jeremie.wenger@....ge.ch>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "anthony.l.nguyen@...el.com" <anthony.l.nguyen@...el.com>,
	"przemyslaw.kitszel@...el.com" <przemyslaw.kitszel@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
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)



On 1/8/2026 4:15 PM, Wenger Jeremie (EDU) via Intel-wired-lan wrote:
> Hello,
> 
> 
> I would like to report a regression in the e1000e driver affecting an 
> Intel integrated Ethernet controller.
> 
> 
> Hardware:
> Intel Ethernet controller [8086:550a]
> Driver: e1000e
> 
> 
> Summary:
> RX stops working after an Ethernet link down/up (unplug/replug cable).
> TX still works. 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?