*** This bug is a duplicate of bug 59695 ***
https://bugs.launchpad.net/bugs/59695
Finally, i solved it on my dell studio 1555. First, gksudo gedit
/boot/grub/menu.lst. And edit it by adding 'noapic' without quotes at the end
of the boot loader entry for the os, after 'ro quiet splash'. Then, run sudo
update-grub. Then, edit /etc/laptop-mode.conf and change
enable_laptop_mode_on_battery to 0. Then, edit all files of the form,
/etc/acpi/*.d/90-hdparm.sh, and replace the line following if
["$State"="battery"] then;
hdparm -B 254 $dev
Else
hdparm -B 254 $dev. Thats all.. The noapic solves the dell studio ubuntu
problem of not recognizing ac adapter, no changing brightness, closing lid lcd
switch off, and elect key. Try it and let me know!
--
Default HD power management settings will kill drive
https://bugs.launchpad.net/bugs/104535
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