User-Agent: Mozilla/5.0 (X11; U; Linux i686; nn-NO; rv:1.9.0.4) 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. Reproducible: Always 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. Actual Results: The value remains the same. In my case it's 128, which I believe is a hardware default. Expected Results: 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