Re: Serious problem with SATA LPM in F28 on Lenovo 50 series laptops

[Hans de Goede]

Hi,

On 29-04-18 09:25, Hans de Goede wrote:
> Hi All,
>
> I'm sending this to the fedora-kernel and -devel lists
> both to get the kernel team aware of this and because it
> is not entirely clear to me how to best deal with this.
>
> I guess we should get this added to the release-notes /
> common-bugs page for F28, but I'm not sure what the
> procedure is for that ?
>
> I've just become aware that at least for some users
> the use of SATA LPM in F28 causes the Lenovo 50
> series laptops (confirmed X250, T450s G50-80) freeze/
> hang hard under certain conditions when using SATA
> LPM, independent of the disk used (*).
>
> This is currently being tracked in:
> https://bugzilla.redhat.com/show_bug.cgi?id=1571330
>
> A known workaround is to add: "ahci.mobile_lpm_policy=0"
> to the kernel boot command line.
>
> Can someone help me to get this documented? Once we've
> figured out what is going on I hope to be able to fix this
> with a kernel update, but people may still need the
> workaround to install Fedora 28.
>
> Also if people are using Fedora 28 on a 50 series Lenovo
> laptop without issues, please let me know.

Some more info on this, the user with a x250 is reporting
the problem is hard-freeze about once a day, which goes
away when disabling LPM, so if you have a 50 series Lenovo
laptop and are seeing the occasional hard-freeze this may
be the cause.

Regards,

Hans