My Western Digital SN850 appears to suffer from deep power state issues - considering submitting quirk patch.

[Christoph Hellwig]

On Sun, May 15, 2022 at 01:44:32PM -0600, Keith Busch wrote:
> Some of the behavior you're describing has been isolated to specific
> drive+platform combinations in the past, but let's hear your results from the
> follow up experiements before considering if we need to introduce a dmi
> type quirk.

Also, are we even sure this is related to power states?

>  
> > Anyway, with all that background, I'm happy to try NVME_QUIRK_NO_DEEPEST_PS for 15b7:5011 locally, and submit here if it works.
> 
> I think that's worth trying. Alternatively, you could just mess with the
> module's param 'nvme_core.default_ps_max_latency_us' value and see if only the
> deepest states or if any low power state is problematic.

Maybe even just nvme_core.default_ps_max_latency_us=0 to verify it
really is power state related as a start.