960 evo + APST

[Mario.Limonciello at dell.com]

> -----Original Message-----
> From: Kai Heng Feng [mailto:kai.heng.feng at canonical.com]
> Sent: Monday, January 15, 2018 5:18 AM
> To: Joshua Bonnett <me at joshuabonnett.com>
> Cc: hch at lst.de; Limonciello, Mario <Mario_Limonciello at Dell.com>; linux-nvme
> <linux-nvme at lists.infradead.org>
> Subject: Re: 960 evo + APST
> 
> >
> > On 15 Jan 2018, at 7:11 PM, Joshua Bonnett <me at joshuabonnett.com> wrote:
> >
> > Really sorry to bother you guys, I am trying to nail down the pm961/sm961/ 960
> evo APST bug and I have a dell xps 15 9560 here with a pm961 and it needed APST
> turned off completely as well and not just turned down. I am just wondering if you
> tested the 960 evo throughly in any other motherboards or laptops?   Thanks!
> 
> Do you mean that disabling PS4 doesn’t help?
> 
> Disable APST completely is not desirable for a laptop.
> 
> Please attach the output of `sudo nvme get-feature -f 0x0c -H /dev/nvme0`
> and `sudo nvme id-ctrl /dev/nvme0`, thanks.
> 
> Kai-Heng
> 
> >
> >
> > (let me know if you want me to just leave you be, and I will just wander off to buy
> some drives or something, no hard feelings)

Joshua,

I had heard that 9550 and 9560 should both be affected by the same problem, but 9560
less severe.

The quirks in kernel don't actually turn down 9560 / Precision 5520 though.  They currently
only apply to XPS 9550/ Precision 5510.  Were you manually setting something to prevent
going into PS4?

Furthermore, can you please share your BIOS version?  Have you updated to the latest one
already?  There are supposed to be BIOS mitigations for this problem too.

The latest one is available on LVFS (1.7.0).
https://fwupd.org/lvfs/device/34578c72-11dc-4378-bc7f-b643866f598c

Thanks,