It may not be necessary to disable NCQ completely, but only for the
TRIM command. The 3.16.0 kernel apparently already contains a blacklist of
devices for which TRIM together with NCQ causes trouble. It is located
in the file:
drivers/ata/libata-core.c
Could anyone, who has already applied the firmware update, plece try
to add an entry like the follwoing to the array ata_device_blacklist in the
above file?
{ "Samsung SSD 840 EVO *", NULL, ATA_HORKAGE_NO_NCQ_TRIM, }
On boot, the resulting kernel should say something like the following
for the 840 EVO:
"disabling queued TRIM support"
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https://bugs.launchpad.net/bugs/1449005
Title:
trim does not work with Samsung 840 EVO after firmware update
(EXT0DB6Q)
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