According to this Q&A laptop-mode-tools and powertop are not needed anymore with ubuntu 12.04 as the power savings are now included in the kernel.
So I decided to remove laptop-mode-tools from my laptop, as it caused my laptop to hang on shutdown when on battery and supposedly would not make any difference in power consumption.
But when I checked powertop after removing laptop-mode-tools I remarked that actually some "Tunables" went from "good" with laptop mode still on, to "bad" after removal.
Bad VM writeback timeout
Bad Runtime PM for PCI Device Fresco Logic FL1000G USB 3.0 Host Controller
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2
Bad Runtime PM for PCI Device Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port
Bad Runtime PM for PCI Device Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller
Bad Runtime PM for PCI Device Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1
Good Wireless Power Saving for interface wlan0
Good Enable SATA link power management for /dev/sda
Good NMI watchdog should be turned off
Good Enable Audio codec power management
Good Bluetooth device interface status
Good Autosuspend for USB device BT-270 (Broadcom Corp)
Good Autosuspend for USB device USB2.0 UVC 2M WebCam (USB2.0 UVC 2M WebCam)
With laptop-mode-tools still on only the first one was marked as "bad".
So my actual questions are:
If those power savings are are integrated in the kernel used by
Ubuntu 12.04, why can powertop see a difference?Will removing laptop-mode-tools change anything to my battery life?
I also installed Jupiter to improve my batterylife, is this
irrelevant as well?
I hope my explanations were somewhat clear. (note that I am quite new to Ubuntu and to GNU/Linux)
Thanks a lot.