> -----Original Message-----
> From: Intel-wired-lan <[email protected]> On Behalf
> Of Vitaly Lifshits
> Sent: Sunday, September 28, 2025 10:01 AM
> To: [email protected]
> Cc: [email protected]; [email protected]; Lifshits,
> Vitaly <[email protected]>
> Subject: [Intel-wired-lan] [PATCH iwl-next v4 1/1] e1000e: Introduce
> private flag to disable K1
>
> The K1 state reduces power consumption on ICH family network
> controllers during idle periods, similarly to L1 state on PCI Express
> NICs. Therefore, it is recommended and enabled by default.
> However, on some systems it has been observed to have adverse side
> effects, such as packet loss. It has been established through debug
> that the problem may be due to firmware misconfiguration of specific
> systems, interoperability with certain link partners, or marginal
> electrical conditions of specific units.
>
> These problems typically cannot be fixed in the field, and generic
> workarounds to resolve the side effects on all systems, while keeping
> K1 enabled, were found infeasible.
> Therefore, add the option for users to globally disable K1 idle state
> on the adapter.
>
> Additionally, disable K1 by default for MTL and later platforms, due
> to issues reported with the current configuration.
>
> Link: https://lore.kernel.org/intel-wired-
> lan/camqyjg3lvqfgqmctxeapur_jq0oqh7ggdxruvtrx_6tth2m...@mail.gmail.com
> /
> Link: https://lore.kernel.org/intel-wired-
> lan/[email protected]/
> Link: https://lore.kernel.org/intel-wired-lan/Z_z9EjcKtwHCQcZR@mail-
> itl/
> Link: https://github.com/QubesOS/qubes-issues/issues/9896
> Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2115393
>
> Signed-off-by: Vitaly Lifshits <[email protected]>
> ---
> v4: Revert changing the reconfiguring function from static
> v3: Removed disabling K1 in watchdog_task and change the private flag
> setting
> v2: Add a missing semaphore acquiring and disable K1 on MTL by default
> ---
...
> --
> 2.34.1
Reviewed-by: Aleksandr Loktionov <[email protected]>
