https://bugzilla.novell.com/show_bug.cgi?id=386555
User pacho@condmat1.ciencias.uniovi.es added comment
https://bugzilla.novell.com/show_bug.cgi?id=386555#c71
--- Comment #71 from Pacho Ramos 2008-06-26 01:39:19 MDT ---
After reading storage-fixup.conf, seems that -B 255 is being used but, after
reading https://wiki.ubuntu.com/DanielHahler/Bug59695 , seems that some drives
would need -B 254 instead. Also laptop-mode-tools now uses 254 instead of 255
from 1.35 version as can be read in http://samwel.tk/laptop_mode/changelog
Also, Is fully disabling Power Manager really needed? Wouldn't it cause some
problems related with overheat or short battery lifetime?
Seems that my hardrive is now using 128 value:
# hdparm -I /dev/sda | grep Advanced
Advanced power management level: 128
* Advanced Power Management feature set
# smartctl -a /dev/sda -d ata | grep Load
193 Load_Cycle_Count 0x0032 090 090 000 Old_age Always -
218785
# smartctl -a /dev/sda -d ata | grep Power
9 Power_On_Seconds 0x0032 076 076 000 Old_age Always
- 12338h+14m+13s
12 Power_Cycle_Count 0x0032 099 099 000 Old_age Always
- 5498
192 Power-Off_Retract_Count 0x0032 098 098 000 Old_age Always
- 569
I am not sure if 218785 is a good value, but, after reading "man hdparm":
-B Set Advanced Power Management feature, if the drive supports it.
A low value means aggressive power management and a high value
means better performance. Possible settings range from values 1
through 127 (which permit spin-down), and values 128 through 254
(which do not permit spin-down). The highest degree of power
management is attained with a setting of 1, and the highest I/O
performance with a setting of 254. A value of 255 tells hdparm
to disable Advanced Power Management altogether on the drive
(not all drives support disabling it, but most do).
Then, seems that 128 doesn't permit spin-down.
Anyway, in hdparm man page also tells you that 254 could be needed in some
cases instead of 255
Thanks a lot
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