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

[Thorsten Leemhuis <regressions@leemhuis.info>]

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
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