Pci Dell Latitude

Linux Notebook battery tips

With the gradual impact of Linux operating system, many Linux users want to be able to run their own Linux operating system, notebook computer, in order to use it.

 

My laptop is a more than a year ago to buy the purple V610D laptop, configuration is as follows: CPU for low voltage (1.05-1.25V) of the AMD Athlon XP-M 1800 +; memory DDR256MB; card SIS650, integrated up to 64MB dynamic video memory ; card is built-in 802.11b wireless card; modem HCF V.90; sound card as AC97 2.13D stereo; USB × 3, VGA interfaces, S Terminal, IEEE 1394, PS / 2, external microphone jack, speaker jack, RJ11 (MODEM) jack, RJ45 (LAN) connector, motherboard chipset is SIS NB 650.

 

System established Win2000, Mandrake nine.1 Linux double organisation. The use of normal laptop, but I concerned that the computing device constitutes the Acer UM09A31 battery problems. Although the written description of power management: Enhanced AMD Power NOW! Technology, the laptop battery type is lithium ion rechargeable Dell Latitude E5400 battery, laptop battery lasts about 4 hours. But in the process of using Linux command line usually began alone 3 60 minutes* from standby time five hours, can be said, and to know the mobile version of the CPU is AMD Athlon XP-M 1800 +, data query through its maximum power at about 25W. After several experiments, the author concludes that in Linux Dell Latitude E5500 battery life some of the skills, we want to help.

 

First, start the Power Management

 

To accomplish power direction, the most important two points: First is the need to support power-saving equipment, Ben Shen chime Neng, such equally Ying Pan, you can temporarily shut down by Zhi Ling; second is to require operating system support for king management, so that you can idle for a period of time in call-driven power direction feature article* off the device. Two kinds of index management standard: APM and ACPI:

 

1, APM

 

Traditional APM (Advanced Power Management) is a standards-based power management bios, the current most former interpretation is 1.2, which provides CPU and device power management features, power management, but as these comprises mainly achieved by the bios, so Some defects, such as excessive dependence along the bios, the inconsistency between the old and new bios, and can not determine power management command are broached aside the user or initiated by the bios of some of the new hardware such as USB and 1394 are not supportive .

 

2, ACPI

 

To make up for deficiencies in APM, the new power management ACPI (Advanced Configuration and ability port) arrived into being, it is mainly the power management of the main actors converted into the operating system from the bios, this will provide greater flexibility and scalability sex. The current mainstream laptop supports APM and ACPI generally two standards.

 

APM can make the machine in Suspend (suspension) or adhere (stick) country, also as check the laptop battery capacity. The ACPI is also able to peripherals (such because: proctor, video card, PCI bus) power alone, the savings inwards force have more control. To enable power management features to take effect, the core in the Bios and Linux to open it, and Linux, load the necessary software.

 

3, check whether the system supports Power Management

 

In the more new core in, are included on ACPI and APM support. Generally, ACPI is activated. Use dmesg to test this:

 

dmesg | egrep-i ‘(apm | acpi)'

 

BIOS-e820: 000000000fff0000 – 000000000fff3000 (ACPI NVS)

 

BIOS-e820: 000000000fff3000 – 0000000010000000 (ACPI data)

 

ACPI: have wakeup address 0xc0001000

 

Kernel command line: BOOT_IMAGE = linux ro root = 307 quiet devfs = mount acpi = on

 

ACPI: Subsystem revision 20030122

 

ACPI: Disabled sis command line (acpi = on)

 

PCI: ACPI tables contain no PCI IRQ routing entries

 

apm: BIOS version 1.3 Flags 0×07 (Driver version 1.16)

 

The author of the ACPI is enabled, so the software, the hardware support is necessary. If your computer does not have ACPI support can

 

http://sf.net/projects/acpi/ download patch. acpi-0.07.tar.gz download link

 

http://grahame.angrygoats.net/source/acpi/acpi-0.07.tar.gz and then install it.

About the Author

http://www.batteryer.co.uk/blog/

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