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Power management for Laptops

Power management for Laptops. Batteries & power management. Nickel Cadmium (Ni-Cd) Nickel-Metal Hydride (Ni-MH) Lithium-Ion (Li-Ion). Nickel Cadmium. Biggest problem Battery Memory. Losing a significant amount of battery life when repeatedly recharging without completely draining.

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Power management for Laptops

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  1. Power management for Laptops

  2. Batteries & power management • Nickel Cadmium (Ni-Cd) • Nickel-Metal Hydride (Ni-MH) • Lithium-Ion (Li-Ion)

  3. Nickel Cadmium • Biggest problem Battery Memory. • Losing a significant amount of battery life when repeatedly recharging without completely draining.

  4. Nickel-metal Hydride • Still susceptible to Battery memory • Still susceptible to heat • Can take more recharges

  5. Lithium-Ion • No longer susceptible to Battery memory. • Last twice as long as Nickel-metal • Cannot handle as many charges as Nickel Cadmium (sacrifice life span for length of time) • Lithium-Ion batteries will explode if over charged. • http://www.youtube.com/watch?v=SMy2_qNO2Y0

  6. Care of batteries & storage • Store batteries in cool place & keep batteries at 70-80% • Never drain batteries all the way to 0% • Remember that a rechargeable batteries has a limited number of recharge/ discharge times

  7. Power management on Notebooks • Every part of a laptop uses power • Earlier laptop used to much power for each individual part constantly draining the batteries • They needed a way for you system to go into a hibernation type mode.

  8. System manage mode (SMM) • Intel began development of a possessor to handle power management • CPU clock speed to slow down or stop without losing running state • Power save mode • Collectively they were called SMM • Was not enough (you need a BIOS & OS that could fully utilize the SMM modes) • BIOS & OS utilization • Intel sent out specifications for APM & ACPI • APM Advanced Power Management • APCI Advanced configuration and power interface

  9. Requirements on APM/ACPI • Need SMM powered CPU • Need APM compliant BIOS • Enables the CPU to shut off peripherals when desired • It also need an OS system that know how to request particular devices to be shut down and to ask for the CPU clock to be slowed or stopped • ACPI (successor to AMP) • ACPI and allows user the ability to manage hot swappable items

  10. APM Levels • Full on (power connected) • APM enables (power disconnected but batteries at full charge) • CPU and RAM are being watched / none used devices may be disabled • APM Standby • CPU is stop and RAM stores all programs all devices are turned off • APM Suspend • Everything on PC is shut down to save power consumption • Critical information is written to the hard drive (typically know as your hibernation state)

  11. ACPI Levels • G0- Fully operational • G1 - into sleep stage mode • S1 CPU stop processing but power to both ram and CPU stay the same • S2 CPU is shut down • S3 Standby mode is enabled RAM stays with power • S4 Hibernation mode is enabled RAM information is stored to HDD • G2 or S5All components turn off except for USB keyboard or mouse • G3 everything is shut off except for the RTC which is the Real time clock and all components are powered down.

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