Created attachment 868988 [details]
Screenshot of boot problem

When booting from Linux 6.4.11 (provided by Tumbleweed's kernel-default package) I run into the following errors:

```
nvme nvme0: controller is down; it will reset: CSTS=0xffffffff, PCI_STATUS=0xffff
nvme nvme0: Does your device have a faulty power saving mode enabled?
nvme nvme0: Try "nvme_core.default_ps_max_latency_us=0 pcie_aspm=off" and report a bug
```

This leads to further errors as the root filesystem is located on that NVMe. See the attached screenshot for details.

When booting from 6.4.8 or 6.4.9 the problem does not occur. I don't have 6.4.10 installed so I haven't tested that version. Maybe 6.4.10 would already introduce the problematic change.

I have re-installed the kernel-default package which also rebuilt the initramfs but the problem persisted.

When adding the kernel parameters as suggested by the error message the problem is gone. Since the error message also suggests to report a bug I'm doing that.

Note that the NVMe itself seems fine. I'm not sure how to answer the question regarding power saving asked by the error message. I only did the short and long SMART tests and they concluded with no error. Considering the system works just fine under older kernel versions or with those kernel parameters I don't think there is a very severe problem with my system and this is rather problematic behaviour of the kernel.

I will attach the SMART output of my NVMe because it might be useful (contains the exact model and firmware version).