Comment # 30 on bug 903560 from grant k

> Run ... and report the result.

find /sys/class/scsi_device/*/device/ -name "manage_start_stop" -o -name
"removable" -o -name "vendor" | xargs cat
    1
    PIONEER
    1
    0
    ATA

> Also spin down is disabled ... why this had been done?

it's an old action.

afaict, the problem had been while using Mozilla apps, Opensuse systems (not
sure, but this may have been back in Opensuse 11X ... not sure WHICH 'Nov 4'
the logs below refer to) would get frequent, random multi-cpu 100% lockups for
seconds-to-minutes.

logs would show

    dmesg
        ...
        Nov  4 11:06:50 prov09 kernel: ata4.00: exception Emask 0x0 SAct 0x0
SErr 0x0 action 0x6 frozen
        Nov  4 11:06:50 prov09 kernel: ata4.00: failed command: FLUSH CACHE EXT
        Nov  4 11:06:50 prov09 kernel: ata4.00: cmd
ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
        Nov  4 11:06:50 prov09 kernel:          res
40/00:00:00:4f:c2/00:00:00:00:00/40 Emask 0x4 (timeout)
        Nov  4 11:06:50 prov09 kernel: ata4.00: status: { DRDY }
        Nov  4 11:06:50 prov09 kernel: ata4: hard resetting link
        Nov  4 11:07:00 prov09 kernel: ata4: softreset failed (1st FIS failed)
        Nov  4 11:07:00 prov09 kernel: ata4: hard resetting link
        Nov  4 11:07:10 prov09 kernel: ata4: softreset failed (1st FIS failed)
        Nov  4 11:07:10 prov09 kernel: ata4: hard resetting link
        Nov  4 11:07:36 prov09 kernel: ata4: SATA link up 3.0 Gbps (SStatus 123
SControl 300)
        Nov  4 11:07:36 prov09 kernel: ata4.00: configured for UDMA/133
        Nov  4 11:07:36 prov09 kernel: ata4.00: retrying FLUSH 0xea Emask 0x4
        Nov  4 11:07:36 prov09 kernel: ata4.00: device reported invalid CHS
sector 0
        Nov  4 11:07:36 prov09 kernel: ata4: EH complete
        ...

This, apparently, was tracked to

   
http://paul.sullivan.za.org/kernel-disables-sata-drive-under-heavy-load-action-0x6-frozen/
    http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=625922

disabling spindown / power mgmt on the drives immediately & persistently solved
the problem in all cases, and, until now, has never manifested any problems or
issues.  Other than possible shorter drive lifes ...

In any case, drive power mgmt state shouldn't inhibit proper shutdown.