On Thu, May 31, 2018 at 01:21:07PM +0200, Hans de Goede wrote:
> Commit 184add2ca23c ("libata: Apply NOLPM quirk for SanDisk
> SD7UB3Q*G1001 SSDs") disabled LPM for SanDisk SD7UB3Q*G1001 SSDs.
>
> This has lead to several reports of users of that SSD where LPM
> was working fine and who know have a significantly increased idle
> power consumption on their laptops.
>
> Likely there is another problem on the T450s from the original
> reporter which gets exposed by the uncore reaching deeper sleep
> states (higher PC-states) due to LPM being enabled. The problem as
> reported, a hardfreeze about once a day, already did not sound like
> it would be caused by LPM and the reports of the SSD working fine
> confirm this. The original reporter is ok with dropping the quirk.
>
> A X250 user has reported the same hard freeze problem and for him
> the problem went away after unrelated updates, I suspect some GPU
> driver stack changes fixed things.
>
> TL;DR: The original reporters problem were triggered by LPM but not
> an LPM issue, so drop the quirk for the SSD in question.
>
> BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1583207
> Cc: stable@xxxxxxxxxxxxxxx
> Cc: Richard W.M. Jones <rjones@xxxxxxxxxx>
> Cc: Lorenzo Dalrio <lorenzo.dalrio@xxxxxxxxx>
> Reported-by: Lorenzo Dalrio <lorenzo.dalrio@xxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Applied to libata/for-4.17-fixes.
Thanks.
--
tejun
