[Bugme-janitors] [Bug 13800] Power is not disabled on USB ports at suspend to RAM

[bugzilla-daemon at bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=13800





--- Comment #14 from Alan Stern <stern at rowland.harvard.edu>  2009-11-01 16:36:07 ---
The usbmon log shows two things.  First, the USB flash device either isn't
working right or else isn't able to read its media.  That's why you got all
those -121 error messages in the dmesg log.

Second, the system does not try to spin down the Lacie disk.  This is
controlled through a sysfs setting.  Look under /sys/class/scsi_disks/sdb (or
something like that) for a file named "manage_start_stop", and write a "1" to
that file.  This should cause the SCSI disk driver to spin the disk down during
a suspend and spin it up during a resume.

If this does what you want, you can write a udev rule that will automatically
set manage_start_stop to 1 for the Lacie drive.

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