libata: Drop SanDisk SD7UB3Q*G1001 NOLPM quirk
authorHans de Goede <hdegoede@redhat.com>
Thu, 31 May 2018 11:21:07 +0000 (13:21 +0200)
committerTejun Heo <tj@kernel.org>
Thu, 31 May 2018 15:45:37 +0000 (08:45 -0700)
commit2cfce3a86b64b53f0a70e92a6a659c720c319b45
tree81e1cadae312e00afbf8da4959a41dd50feaf8ce
parent18c9a99bce2a57dfd7e881658703b5d7469cc7b9
libata: Drop SanDisk SD7UB3Q*G1001 NOLPM quirk

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@vger.kernel.org
Cc: Richard W.M. Jones <rjones@redhat.com>
Cc: Lorenzo Dalrio <lorenzo.dalrio@gmail.com>
Reported-by: Lorenzo Dalrio <lorenzo.dalrio@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: "Richard W.M. Jones" <rjones@redhat.com>
drivers/ata/libata-core.c