Bug 218499

Summary:	Intel Corporation Ethernet Controller I226-V - Prevent higher C-States
Product:	Drivers	Reporter:	JT (justin)
Component:	Network	Assignee:	drivers_network (drivers_network)
Status:	NEW ---
Severity:	normal	CC:	email+bugzilla.kernel.org, plainred, tobias.diendorfer
Priority:	P3
Hardware:	Intel
OS:	Linux
Kernel Version:	6.1.64	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	Powertop whit Networkcable Asus Support Windows with PowerHousemountain

Description JT 2024-02-16 08:54:00 UTC

Hello,

i am currently using Unraid as OS and can't reach any higher C-States then C2/C3 while the Networkcable is pluged in. If i unplug the Network-Cable the system reaches immediately higher C-States (C6-C8) 

Asked the Mainboard Vendor for issue or dependency and Asus told me there are no issues and they can reach higher C-States in Powerhouse Mountain so it should be an Linux issue.

Which Information do you need?

Greetings
JT

Comment 1 JT 2024-02-19 07:43:46 UTC

Created attachment 305892 [details]
Powertop whit Networkcable

Unraid

Comment 2 JT 2024-02-19 07:44:48 UTC

Created attachment 305893 [details]
Asus Support Windows with PowerHousemountain

Comment 3 TOMillr 2024-05-29 13:32:51 UTC

According to creator of powertop, issue is caused by a bug in the kernel driver for the Intel I226-V ethernet network controller.

https://github.com/fenrus75/powertop/issues/143

Comment 4 TOMillr 2024-05-29 13:34:03 UTC

Can replicate bug on an Odroid H4+ board running Ubuntu Server 24.04 LTS.

Comment 5 TOMillr 2024-09-01 14:42:59 UTC

Bug still present in new release Ubuntu 24.04.1 LTS. Driver fails when power management is activated.

Comment 6 red 2024-10-28 19:52:54 UTC

When enabling the power-saving tunable for the Intel Ethernet Controller I226-V using powertop, the system hangs. This issue occurs consistently and requires a hard reboot to recover. The problem persists across multiple kernel versions. Manually enabling the tunable using `echo "auto" > /sys/bus/pci/devices/0000:05:00.0/power/control` also causes the system to hang.

Steps to Reproduce:

    Install powertop on a system with the Intel Ethernet Controller I226-V.
    Run powertop with superuser privileges: sudo powertop.
    Navigate to the Tunables tab.
    Enable the tunable for the Intel Ethernet Controller I226-V.
    Alternatively, manually enable the tunable using: echo "auto" > /sys/bus/pci/devices/0000:05:00.0/power/control.
    Observe that the system hangs and becomes unresponsive.

Expected Result: The Ethernet controller should enter a low-power state without causing the system to hang.

Actual Result: The system hangs and becomes unresponsive, requiring a hard reboot.

Comment 7 JT 2024-11-02 09:38:51 UTC

i can confirm that the system gets unresponsive if your turn on power saving.

Comment 8 popy 2025-03-21 18:49:57 UTC

Hey guys.

Kernel 6.12 (new LTS) dropped a few months back.
I read somewhere that the issue was solved around ~6.11 kernel.

Can anyone of you please confirm the issue is solved in 6.12?