I peeked at the source code. The ATA smart collect script is called by
the daemon like this:
/usr/lib/devicekit-disks/devkit-disks-helper-ata-smart-collect
/dev/sdb 1
The "1" parameter is the "nowakeup" option. Executing the above call as
root always spins up my disk (also when replacing "1" with "0"). The
corresponding code is:
nowakeup = atoi (argv[2]);
if (sk_disk_open (device, &d) != 0) {
g_printerr ("Failed to open disk %s: %m\n", device);
goto out;
}
if (sk_disk_check_sleep_mode (d, &awake) != 0) {
g_printerr ("Failed to check if disk %s is awake: %m\n",
device);
goto out;
}
/* don't wake up disk unless specically asked to */
if (nowakeup && !awake) {
g_printerr ("Disk %s is asleep and nowakeup option was
passed\n", device);
ret = 2;
goto out;
}
So either sk_disk_check_sleep_mode fails to detect that the disk is
sleeping, or the nowakeup option is parsed incorrectly. I'll debug that
later.
--
Disk wakes up every 30 minutes and produces errors on dmesg
https://bugs.launchpad.net/bugs/435190
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