"controller is down; will reset" on SK Hynix NVMe drive in Lenovo IdeaPad Pro 5

[Thomas ten Cate]

On Tue, Nov 18, 2025 at 9:49 PM Keith Busch <kbusch at kernel.org> wrote:
>
> The "report a bug" message was originally pointed at hardware vendors
> rather than kernel. Something is wrong with the SSD, the PCIe slot, or
> both if the power features cause the endpoint to drop off the bus. The
> only recourse we have in the nvme driver is a quirk to disable APST for
> the device. The driver doesn't control the PCIe ASPM settings though, so
> that would have to be a different quirk if it's really necessary. Do you
> need all three of those parameters, or is disabling the nvme driver's
> apst sufficient on its own? These parameters do have a negative impact
> on your machine's power consumption, so you'd usually want to hone in if
> it's just the deepest power state or if every power saving feature
> really needs to be disabled.

Thanks for your reply!

Just `nvme_core.default_ps_max_latency_us=0` appears to be sufficient,
so presumably it's the drive, not the bus. I wouldn't even know where
to begin reporting a bug to the manufacturer.

Still, it's odd that the problem manifested differently, and much less
severely, on an older kernel. ¯\_(ツ)_/¯

I've linked to this thread on the Arch wiki [1] to let others chime
in, in case a single report is not enough evidence to add a quirk to
the driver.

[1] https://wiki.archlinux.org/title/Solid_state_drive/NVMe#Controller_failure_due_to_broken_APST_support