Wow... I don't believe.
Same problem in my Lenovo Thinkpad T61!
laptop-mode-tools 1.45-1
acpi-support 0.109-11
When AC is conected:
====================
Ter Fev 17 10:14:22 BRT 2009
Load_Cycle_Count 0x0012 099 099 000 Old_age Always - 10820
Ter Fev 17 11:59:26 BRT 2009
Load_Cycle_Count 0x0012 099 099 000 Old_age Always - 10820
====================
As you can see, no spin-up and spin-down.
But when AC is removed:
====================
Ter Fev 17 11:59:26 BRT 2009
Load_Cycle_Count 0x0012 099 099 000 Old_age Always - 10820
Ter Fev 17 12:27:48 BRT 2009
Load_Cycle_Count 0x0012 099 099 000 Old_age Always - 10840
====================
I don't use my laptop when I removed AC (because I go to lunch), but my
HDD spin-up and spin-down 20 times in 28 minutes!
=== START OF INFORMATION SECTION ===
Device Model: HITACHI HTS722010K9SA00
Serial Number: 080222DP0210DPGAZS7P
Firmware Version: DC2ZC75A
User Capacity: 100,030,242,816 bytes
Device is: Not in smartctl database [for details use: -P showall]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 3f
Local Time is: Tue Feb 17 12:41:26 2009 BRT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
My HDD have:
Power_On_Hours - 1194
Load_Cycle_Count - 10840
It means: 9 Load Cycle in each hour!
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