on my T430s I was trying to get better battery life. Finally I was successful, thanks to Arch forums https://bbs.archlinux.org/viewtopic.php?id=135820 . (the right solution for me was: i915 kernel cmdline options + laptop-mode-tools + cpupower).
With cpufrequtils package installed I cannot get better battery life, but once I’ve replace it by cpupower (emerge -C cpufrequtils && emerge cpupower) the battery life was doubled!
So far I understand that cpufrequtils package is intended to use with older CPUs (older than core2duo), and cpupower is to be used with newer CPUs. This appear to be true in my case.
The question is, why default installation of Calculate linux contains cpufrequtils instead of cpupower ?
Maybe installer could detect the cpu during the installation and decide which one to install. Also, adding the Laptop option to the installer would be great.
Please correct me if I made wrong presumption in some point.
After refreshing your grub configuration you can try to reboot to see the changes
# grub-mkconfig -o /boot/grub/grub.cfg
NOTE that using the “i915.lvds_downclock=1” option I’ve experienced some video performance problems on the T440s. Also note that T440s needs different option “acpi_backlight=’!Windows2012’” option to fix the backlight control, compare to the T430.
EDIT:
I also need to update settings in /etc/laptop-mode/conf.d/cpufreq.conf