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.
As the reporter of the original issue, I agree with Hans's analysis above, so ACK from me.
Rich.
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
Changes in v2:
-Rebase on 4.17-rc7
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 346b163f6e89..9bfd2f7e4542 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4557,9 +4557,6 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = { { "SAMSUNG MZMPC128HBFU-000MV", "CXM14M1Q", ATA_HORKAGE_NOLPM, }, { "SAMSUNG SSD PM830 mSATA *", "CXM13D1Q", 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_M500IT_*", "MU01", ATA_HORKAGE_NO_NCQ_TRIM | ATA_HORKAGE_ZERO_AFTER_TRIM, },
-- 2.17.0