Re: [Intel-wired-lan] suspend/resume broken of igc driver broken on 6.12

["Lifshits, Vitaly" <vitaly.lifshits@intel.com>]

On 1/30/2025 7:11 PM, Stephen Hemminger wrote:
> I am using:
> 
> 5a:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-LM (rev 04)
> 	Subsystem: Intel Corporation Device 0000
> 	Flags: bus master, fast devsel, latency 0, IRQ 19, IOMMU group 20
> 	Memory at 6c500000 (32-bit, non-prefetchable) [size=1M]
> 	Memory at 6c600000 (32-bit, non-prefetchable) [size=16K]
> 	Capabilities: [40] Power Management version 3
> 	Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
> 	Capabilities: [70] MSI-X: Enable+ Count=5 Masked-
> 	Capabilities: [a0] Express Endpoint, IntMsgNum 0
> 	Capabilities: [100] Advanced Error Reporting
> 	Capabilities: [140] Device Serial Number 58-47-ca-ff-ff-7a-98-3d
> 	Capabilities: [1c0] Latency Tolerance Reporting
> 	Capabilities: [1f0] Precision Time Measurement
> 	Capabilities: [1e0] L1 PM Substates
> 	Kernel driver in use: igc
> 	Kernel modules: igc
> 
> 
> Using both Debian testing and my own kernel built from 6.12, the igc
> driver appears broken after resume.

 From which system state are you resuming?

> 
> After resuming the device is down and no address present.
> Attempts to set link up manually fail.

Did you get any errors in the dmesg log?
What is the firmware version on your device (you can get it by running 
ethtool -i)?

> If I do rmmod/modprobe of igc it comes back.
> 
> Doing a bit of bisectting but it is slow going.

Meanwhile, we'll also try to reproduce this issue in our lab.  Could you 
share more details about your system so we can create a similar setup?