Attachment 1446225 Details for Bug 1583207 – [PATCH] libata: Drop SanDisk SD7UB3Q*G1001 NOLPM quirk

[patch] [PATCH] libata: Drop SanDisk SD7UB3Q*G1001 NOLPM quirk

0001-libata-Drop-SanDisk-SD7UB3Q-G1001-NOLPM-quirk.patch (text/plain), 2.20 KB, created by Hans de Goede on 2018-05-31 11:17:58 UTC

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Creator: Hans de Goede

Created: 2018-05-31 11:17:58 UTC

Size: 2.20 KB

patch

obsolete

>From f75f57a4a21b95d4c430298bcc7d310fb084b673 Mon Sep 17 00:00:00 2001
>From: Hans de Goede <hdegoede@redhat.com>
>Date: Thu, 31 May 2018 13:04:51 +0200
>Subject: [PATCH] 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>
>---
> drivers/ata/libata-core.c | 3 ---
> 1 file changed, 3 deletions(-)
>
>diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
>index 68596bd4cf06..6e400ff2b5db 100644
>--- a/drivers/ata/libata-core.c
>+++ b/drivers/ata/libata-core.c
>@@ -4552,9 +4552,6 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = {
> 	/* This specific Samsung model/firmware-rev does not handle LPM well */
> 	{ "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM, },
> 
>-	/* Sandisk devices which are known to not handle LPM well */
>-	{ "SanDisk SD7UB3Q*G1001",	NULL,	ATA_HORKAGE_NOLPM, },
>-
> 	/* devices that don't properly handle queued TRIM commands */
> 	{ "Micron_M500_*",		NULL,	ATA_HORKAGE_NO_NCQ_TRIM |
> 						ATA_HORKAGE_ZERO_AFTER_TRIM, },
>-- 
>2.17.0
>

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