Power Management Optimization in Ubuntu laptop

**Ransom** · 27-03-2010

Hi all,

I complain about linux power management is very bad, what to say under the shorter battery life than win a lot. Linux actually offer a lot of power optimization features, but by default, the settings do not take into account the power to use Bale. Here I am with ubuntu edgy, can any body help me about Power Management Optimization in Ubuntu laptop. Thanks in advance.

**Devasis** · 27-03-2010

First of all you have to check your BIOS power management settings, first close all the bios to support power management, only by the operating system power management settings, and then restore BOIS for power management. Edgy default kernel is to support acpi, if you have a custom compiled kernel, should remember that the power management-related modules chosen. Check and reply.

Dr. V · 27-03-2010

You need to reduce the brightness of the small manual adjustment that can be had; Then set the DPMS (Display Power Management Signaling). Modify the sudo vi / etc/X11/xorg.conf file by below code:

Code:

Section "ServerLayout"
Identifier [...]
Option "BlankTime" "7" # Blank the screen after 7 minutes (Fake)
Option "StandbyTime" "12" # Turn off screen after 12 minutes (DPMS)
Option "SuspendTime" "22" # Full suspend after 22 minutes
Option "OffTime" "30" # Turn off after half an hour
EndSection
Section "Monitor"
Identifier [...]
Option "DPMS" "true"
EndSection

**SalVatore** · 27-03-2010

Support for mobile versions of the CPU frequency and voltage dynamically adjusted, in most cases, your CPU is not necessary to run at full speed, especially in the battery, we can force the CPU to run at the lowest frequencies. In the linux 2.6 kernel after the cpu frequency on supporting the dynamic adjustment, there are the following four kinds of modes
# performance will set the CPU frequency to support the maximum frequency, rather than dynamic regulation.
# powersave the CPU frequency is set to the minimum
# on demand fast dynamic adjustment of CPU frequency, Pentuim M's CPU can be used
# conservative and ondemand different smoothing to adjust CPU frequency, suitable for battery work.

**jesse** · 27-03-2010

You first do a rough calculation, if the hard drive of your laptop in energy saving mode, how much time can be extended.

Code:

cat / proc / acpi / battery / BATx / info

It will display like :

Code:

present: yes
design capacity: 8000 mAh
last full capacity: 3800 mAh
battery technology: rechargeable
design voltage: 14000 mV
design capacity warning: 200 mAh
design capacity low: 130 mAh
capacity granularity 1: 10 mAh
capacity granularity 2: 25 mAh
model number: JM-6
serial number: xxxxxxxxxxxxxxx
battery type: LION
OEM info: Hewlett-Packard

**Lillebror** · 27-03-2010

Through the following command to see the state of laptop-mode

Code:

sudo / etc / init.d / laptop-mode status

Use tmpfs to a temporary file into memory. tmpfs as a virtual disk (ramdisk), but not exactly the same. The same as the virtual disk, tmpfs. You can use your RAM, but it can also use your swap partition to store. And the traditional virtual disk is a block device, and the need for a mkfs sort of command in order to really use it, tmpfs is a file system, rather than a block device; you just install it, it can use. All in all, this so tmpfs. I had the opportunity to meet to become the best RAM-based file system. Modify / etc / fstab, the tmpfs mount to the / tmp on and set the maximum limit of 32M. Check and reply.