Red Hat Bugzilla – Bug 473568
F10: Doesn't adjust hard drive power management setting (hdparm -B) when on battery/mains
Last modified: 2015-03-04 20:20:12 EST
User-Agent: Mozilla/5.0 (X11; U; Linux i686; nn-NO; rv:220.127.116.11) Gecko/2008111318 Ubuntu/8.10 (intrepid) Firefox/3.0.4
I'm testing F10 (KDE version) and noticed that it does not control the power management setting of my hard drive.
This is bad for two reasons:
1) shortens battery lifetime when on battery;
2) it causes excessive head parking when on mains, which in turn
* causes an annoying clicking sound every few seconds,
* shortens the life span of the hard drive itself, and
* prevents the hard drive from performing optimally.
Steps to Reproduce:
1. Boot up F10 on a laptop, check APM status: «hdparm -I /dev/sda | grep 'power management level'»
2. Disconnect mains, check it again.
3. Reconnect mains, check it again.
The value remains the same. In my case it's 128, which I believe is a hardware default.
Maximum power savings when on battery (level 1), disabled power management when on mains (level 255).
Hardware profile: http://smolts.org/client/show_all/pub_017cc1e3-8586-4df7-bc26-12b3e1fe58d7
Ubuntu bug: https://bugs.launchpad.net/bugs/59695
We don't want to change this based on session profile. Lots has been written on this in the past, please see http://www.codon.org.uk/~mjg59/power/good_practices.html