The subject line pretty much says it all - tail /etc/acpi/acpi-support shows
# Switch to laptop-mode on battery power - off by default as it causes odd # hangs on some machines ENABLE_LAPTOP_MODE=false but according TFM, laptop mode is what allows the hard drive to spin down, etc. I understand why it is off - same reasoning as causes ACPI to be off by default on my laptop, basically the precautionary principle at work, but when should be it on, and who turns it on, other than a power user at the command line? Additional background.... There are only two mentions of this setting in wiki.ubuntu.com, one related to ATI cards, and the other to a specific laptop: https://wiki.ubuntu.com/LaptopTestingTeam/ThinkpadX60s Interestingly enough, thinkwiki.org also has only two mentions of this setting, again one for an ATI video card (prob. related to the Ubuntu wiki page) and another that mentions editing the file by hand to get "proper power management". On a semi-related note, I filed a bug and patch against the laptop_mode script this morning, FYI: https://launchpad.net/distros/ubuntu/+source/laptop-mode/+bug/77560 pww
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