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Old 11-30-2013, 02:08 PM   #1
Registered: Nov 2003
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USB disk won't sleep under Slackware-14.1

Sequel to my: USB disk won't sleep under Slackware 14.0

The fix under Slackware 14.0 (udisks2-1.98.0) was to use a udev rule to add ID_ATA_FEATURE_SET_SMART_ENABLED=0 which stopped udisks2 from polling the disk every 10 minutes and keeping it from sleeping.

This no longer works in Slackware 14.1 with udisks2-2.1.0. I've tried that, and several others (ID_ATA_FEATURE_SET_SMART=0, UDISKS_ATA_SMART_IS_AVAILABLE=0) to no avail; udisks2 still polls the disk for SMART information every 10 minutes, keeping it from sleeping.

Any ideas out there? (Other than removepkg udisks2)
Old 11-30-2013, 06:35 PM   #2
Registered: Nov 2003
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I got a workaround, disabling SMART capability on the drive (here sdb):
# smartctl -s off /dev/sdb
This setting is apparently saved in the disk drive's own NVRAM, so it only needs to be used once. The trick is that it has to be run while the udisks2 daemon udisksd is NOT running. (If I disable SMART on the drive while udisksd is running, udisksd helpfully turns it right back on.) Once this is done, and udisksd restarted, the disk is no longer polled, and it goes to sleep as it should.

But it does seem to be a bug in udisks2, that the udev property ID_ATA_FEATURE_SET_SMART_ENABLED is not transfered into udisks2 to set the SmartEnabled property.
Old 12-01-2013, 06:12 AM   #3
Registered: Sep 2011
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Why is udisks2 using SMART commands without being configured to do so? There are broken drives out there, which corrupt data if SMART commands are used in parallel to writing. Why is broken software like this included with Slackware?


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