[Bug 2081130] Re: Intel(R) PRO/1000 I219 ethernet adapter [8086:550c] may block entrance of modern standby

Verified linux-oem-6.11/noble-proposed version 6.11.0-1007.7.

** Tags removed: verification-needed-noble-linux-oem-6.11
** Tags added: verification-done-noble-linux-oem-6.11

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https://bugs.launchpad.net/bugs/2081130

Title:
Intel(R) PRO/1000 I219 ethernet adapter [8086:550c] may block entrance
of modern standby

Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux source package in Noble:
Won't Fix
Status in linux-oem-6.11 source package in Noble:
Fix Committed
Status in linux source package in Oracular:
Fix Committed
Status in linux-oem-6.11 source package in Oracular:
Invalid

Bug description:
[SRU Justification]

[Impact]

Systems with Intel(R) PRO/1000 I219 ethernet adapter [8086:550c] may
block entrance of modern standby.

[Fix]

This is a composition of multiple factors. For the e1000e driver to suspend correctly, it takes:
* v6.12-rc1 commit [cedf233530cc3](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cedf233530cc375343c5a0b612fe94392f246c99) ("platform/x86: intel/pmc: Ignore all LTRs during suspend")
* v6.12-rc3 commit [9d9e5347b0354](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d9e5347b035412daa844f884b94a05bac94f864) ("e1000e: change I219 (19) devices to ADP")

And there is also a problem in APIC working in deadline mode. When shutting down the APIC timer, both APIC_LVT_MASKED and clear the counter register should be done, and this takes:
* https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=ffd95846c6ec6cf1f93da411ea10d504036cab42 ("x86/apic: Always explicitly disarm TSC-deadline timer")

[Test Case]

```
$ sudo cat /sys/power/suspend_stats/total_hw_sleep
0
$ sudo rtcwake -m freeze -s 120
# wait ...
$ sudo cat /sys/power/suspend_stats/total_hw_sleep
117855416
$ sudo cat /sys/kernel/debug/pmc_core/package_cstate_show
...
Package C10 : 117924661
```

[Where problems could occur]

The first part can be treated as a new hardware support. The APIC
timer part is a common issue probably tracing back to the Nehalem
microm architecture. It has been landed to x86/urgent tree and will be
in v6.12-rc4. It's also cc-stabled.

[Other Info]

This is cc-stabled. We're probably going to meet it again for maybe
6.8 LTS kernels. Before that, SRU for OEM-6.11 hardware enablement.

========== original bug report ==========

Proposed fixes from vendor:
* v6.12-rc1 commit cedf233530cc3 ("platform/x86: intel/pmc: Ignore all LTRs during suspend")
* v6.12-rc3 commit 9d9e5347b0354 ("e1000e: change I219 (19) devices to ADP")
* https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git/commit/?h=x86/urgent&id=ffd95846c6ec6cf1f93da411ea10d504036cab42 ("x86/apic: Always explicitly disarm TSC-deadline timer")

80:1f.6 Ethernet controller [0200]: Intel Corporation Device [8086:550c] (rev 10)
        DeviceName: To Be Filled by O.E.M.
        Subsystem: Dell Device [1028:0d07]
        Kernel driver in use: e1000e
        Kernel modules: e1000e

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