Power Drain Issue

[limerro]

Witam,

 

Wnikliwi obserwatorzy zauważyli zapewne, że część portali zaczęła testować czas pracy na aku także z podłączonymi urządzeniami USB. Ma to związek z niedawno wykrytym (konkretnie od premiery notebooków opartych na platformie NAPA) problemem "Power Drain Issue", czyli znacznego skrócenia czasu pracy na aku podczas korzystania z urządzeń USB 2.0. Problem może dotyczyć także platformy AMD a także stacjonarnych komputerów. Microsoft stworzył nieoficjalny patch polegający na modyfikacji rejestru dostępny dla firm produkujących notebooki. Pozwala na wydłużenie czasu pracy o kilkadziesiąt minut !!! Zapraszam, więc do leORT: ORT: ORT: ktury, modyfikacji rejestru i pomiarów:

 

AnandTech - Intel Core Duo USB Issue: A Mischaracterized Bug

TG Daily - Microsoft driver bug saps Core Duo power

TG Daily - Microsoft to release patch for power drain bug

USB 2.0 Cuts Battery Life on Intel Laptops by 30%

 

Software do pomiarów czasu pracy na aku:

 

Battery Eater

Battery Mark 4.0.1

 

"Partner Only Article Article ID : 899179

 

Last Review : July 12, 2005

 

Revision : 1.0

 

 

Important This article contains information about how to modify the registry. Make sure to back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

 

 

SYMPTOMS

 

Consider the following scenario. You install Microsoft Windows XP Service Pack 2 (SP2) on a portable computer. Then, you connect a USB 2.0 device to the computer. In this scenario, the computer uses its battery power more quickly than you expect.

 

 

CAUSE

 

Windows XP SP2 installs a USB 2.0 driver that initializes any connected USB device. However, the USB 2.0 driver leaves the asynchronous scheduler component continuously running. This problem causes continuous instances of memory access that prevent the computer from entering the deeper Advanced Configuration and Power Interface (ACPI) processor idle sleep states. These processor idle sleep states are also known as C states. For example, these include the C3 and C4 states. These sleep states are designed, in part, to save battery power. If an otherwise idle portable computer cannot enter or maintain the processor idle sleep states, the computer uses its battery power more quickly than you expect.

 

 

RESOLUTION

 

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk. To resolve this problem, add the EnIdleEndpointSupport entry to the USB registry key. To do this, follow these steps:

 

 

1. Click Start, click Run, type regedit, and then click OK.

 

2. Locate, and then click the following registry subkey:

 

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Servic es\USB

 

Note If the USB subkey does not exist, create it. To do this, follow these steps: a. Select the Services key. On the Edit menu, point to New, and then click Key. b. Type USB in the New Key #1 box to name the new key "USB."

 

3. Right-click USB, point to New, and then click DWORD Value.

 

4. In the New Value #1 box that appears, type EnIdleEndpointSupport, and then press ENTER.

 

5. Right-click EnIdleEndpointSupport, and then click Modify.

 

6. In the Value data box, type 1, leave the Hexadecimal option selected, and then click OK.

 

7. Quit Registry Editor."

 

Pozdrawiam,

 

Moderator.

Edytowane 17 Marca 2006 przez limerro

[costi]

Czy to sie tyczy tylko laptopow z Core Duo, czy wszystkich?

[limerro]

Napewno problem dotyczy platformy Intela - Sonoma i Core Duo. Platformy AMD jeszcze nie przetestowano.

[sansaba]

Na Celeronie M nie ma żadnej róznicy - przynajmniej u mnie...

Pozdrawiam

[M4ciek]

poprawka dla chętnych w załączniku

WindowsXP_KB918005_v2_x86_PLK.zip