On Sun, 28 Sep 2025 11:00:40 +0300 Vitaly Lifshits <[email protected]> wrote:
> 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 > --- >... Reviewed-by: Timo Teräs <[email protected]> Tested-by: Timo Teräs <[email protected]>
