Comment 55 for bug 952556

after setting apm_battery=128 in my /etc/hdparm.conf
as well as in /lib/hdparm/hdparm-functions:
            if hdparm_is_on_battery; then
                hdparm_set_option -B128

Here is what I get with sudo hdparm -I /dev/sda

 Advanced power management level: 1

Complete log: apparently, same HD as Swâmi Petaramesh above

/dev/sda:

ATA device, with non-removable media
 Model Number: SAMSUNG HN-M101MBB
 Serial Number: S2RQJ9ABB07710
 Firmware Revision: 2AR10001
 Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
 Used: unknown (minor revision code 0x0028)
 Supported: 8 7 6 5
 Likely used: 8
Configuration:
 Logical max current
 cylinders 16383 16383
 heads 16 1
 sectors/track 63 63
 --
 CHS current addressable sectors: 1032129
 LBA user addressable sectors: 268435455
 LBA48 user addressable sectors: 1953525168
 Logical Sector size: 512 bytes
 Physical Sector size: 4096 bytes
 Logical Sector-0 offset: 0 bytes
 device size with M = 1024*1024: 953869 MBytes
 device size with M = 1000*1000: 1000204 MBytes (1000 GB)
 cache/buffer size = 8192 KBytes
 Form Factor: 2.5 inch
 Nominal Media Rotation Rate: 5400
Capabilities:
 LBA, IORDY(can be disabled)
 Queue depth: 32
 Standby timer values: spec'd by Standard, no device specific minimum
 R/W multiple sector transfer: Max = 16 Current = 16
 Advanced power management level: 1
 Recommended acoustic management value: 254, current value: 128
 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 udma5 *udma6
      Cycle time: min=120ns recommended=120ns
 PIO: pio0 pio1 pio2 pio3 pio4
      Cycle time: no flow control=120ns IORDY flow control=120ns
Commands/features:
 Enabled Supported:
    * SMART feature set
      Security Mode feature set
    * Power Management feature set
    * Write cache
    * Look-ahead
    * Host Protected Area feature set
    * WRITE_BUFFER command
    * READ_BUFFER command
    * NOP cmd
    * DOWNLOAD_MICROCODE
    * Advanced Power Management feature set
      Power-Up In Standby feature set
    * SET_FEATURES required to spinup after power up
      SET_MAX security extension
    * Automatic Acoustic Management feature set
    * 48-bit Address feature set
    * Device Configuration Overlay feature set
    * Mandatory FLUSH_CACHE
    * FLUSH_CACHE_EXT
    * SMART error logging
    * SMART self-test
    * General Purpose Logging feature set
    * 64-bit World wide name
    * IDLE_IMMEDIATE with UNLOAD
    * WRITE_UNCORRECTABLE_EXT command
    * {READ,WRITE}_DMA_EXT_GPL commands
    * Segmented DOWNLOAD_MICROCODE
    * Gen1 signaling speed (1.5Gb/s)
    * Gen2 signaling speed (3.0Gb/s)
    * Native Command Queueing (NCQ)
    * Host-initiated interface power management
    * Phy event counters
    * Idle-Unload when NCQ is active
    * NCQ priority information
    * DMA Setup Auto-Activate optimization
    * Device-initiated interface power management
    * Software settings preservation
    * SMART Command Transport (SCT) feature set
    * SCT Long Sector Access (AC1)
    * SCT LBA Segment Access (AC2)
    * SCT Error Recovery Control (AC3)
    * SCT Features Control (AC4)
    * SCT Data Tables (AC5)
Security:
 Master password revision code = 65534
  supported
 not enabled
 not locked
  frozen
 not expired: security count
  supported: enhanced erase
 210min for SECURITY ERASE UNIT. 210min for ENHANCED SECURITY ERASE UNIT.
Logical Unit WWN Device Identifier: 50024e920670e1bf
 NAA : 5
 IEEE OUI : 0024e9
 Unique ID : 20670e1bf
Checksum: correct