Re: [REGRESSION] e1000e: heavy packet loss on Lenovo ThinkPad P14s Gen 5 (I219-LM, Meteor Lake) after K1 re-enable; fixed by disable-k1

[Tony Nguyen <anthony.l.nguyen@intel.com>]

On 9/24/2026 12:34 AM, Thorsten Leemhuis wrote:
> On 9/15/26 10:57, Javier Herrera wrote:
>>
>> Since commit 578294b8b60d ("e1000e: Reconfigure PLL clock gate timeout and
>> re-enable K1 on Meteor Lake") the integrated I219-LM in a Lenovo ThinkPad
>> P14s Gen 5 (Intel variant, Core Ultra 9 185H) shows constant packet loss
>> and erratic latency on the wired link. Wi-Fi and a USB-C RTL8152 adapter on
>> the same cable, switch and router are fine, so the network itself is not
>> the problem.
>>
>> Setting the private flag "disable-k1" fixes it immediately, so this looks
>> like another system where the PLL clock gate reconfiguration is not enough
>> and the DMI quirk table introduced by that commit should be extended.
>> [...]
> 
> Dima or e1000e maintainers, could you please submit and upstream a quirk
> entry to resolve this regression? Ideally with a stable tag? Javier

Dima is out on vacation at the moment; I'll prepare a patch to add this 
entry to the quirks.

Thanks,
Tony

> afaics provided everything needed for this. Reminder, Linus rule of
> thumb wrt to regressions is "generally fix them within a week,
> preferably before the next rc.":
> https://www.kernel.org/doc/html/latest/process/handling-regressions.html#on-how-quickly-regressions-should-be-fixed
> 
> Or is there some reason why the quirk entry is a bad idea here?
> 
> Sending this as things looked stalled from here; or was there some
> progress to resolve this already which I missed?
> 
> Ciao, Thorsten