Feeds

MS patches Win XP Core Duo battery drain bug

One out of three causes fixed

Secure remote control for conventional and virtual desktops

Microsoft has fixed the battery drain bug that has been affecting a number of computer owners with Intel Core Duo-based notebooks. However, two of the three causes of the drain are not fixed by a patch posted by Microsoft yesterday.

The problem emerged in January. At least some Core Duo machines connected to USB peripherals suffer a persistent loss of battery charge above and beyond what you'd expect. Originally thought to be an issue with Intel's chipset, the bug was later identified as a glitch in Windows XP Service Pack 2's power management code that had, in fact, affected older, pre-Core Duo notebooks running the OS.

In February, Microsoft said it was working on a fix and the patch has now arrived. Well, sort of. The patch fixes faster-than-usual battery drains arising from the CPU's inability to enter Advanced Configuration and Power Interface (ACPI) processor idle sleep states as a result of the USB 2.0 driver leaving "the asynchronous scheduler component running continuously".

However, the patch doesn't prevent the USB host controller from finding itself unable to shut down when devices are removed from nested USB hubs, or when said controller is hooked up to USB 2.0 devices that make use of its periodic scheduler. Both instances can also cause the exceptional power drain, but neither are fixed by the patch.

And Microsoft also warns: "Various factors can affect the battery life of different portable computers that use different types of batteries. Therefore, you may not notice any improvement in battery life after you apply this update."

You can get the patch here. ®

Beginner's guide to SSL certificates

More from The Register

next story
Xperia Z3: Crikey, Sony – ANOTHER flagship phondleslab?
The Fourth Amendment... and it IS better
Don't wait for that big iPad, order a NEXUS 9 instead, industry little bird says
Google said to debut next big slab, Android L ahead of Apple event
Microsoft to enter the STRUGGLE of the HUMAN WRIST
It's not just a thumb war, it's total digit war
Ex-US Navy fighter pilot MIT prof: Drones beat humans - I should know
'Missy' Cummings on UAVs, smartcars and dying from boredom
Netscape Navigator - the browser that started it all - turns 20
It was 20 years ago today, Marc Andreeesen taught the band to play
A drone of one's own: Reg buyers' guide for UAV fanciers
Hardware: Check. Software: Huh? Licence: Licence...?
The Apple launch AS IT HAPPENED: Totally SERIOUS coverage, not for haters
Fandroids, Windows Phone fringe-oids – you wouldn't understand
Apple SILENCES Bose, YANKS headphones from stores
The, er, Beats go on after noise-cancelling spat
prev story

Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Why and how to choose the right cloud vendor
The benefits of cloud-based storage in your processes. Eliminate onsite, disk-based backup and archiving in favor of cloud-based data protection.
Three 1TB solid state scorchers up for grabs
Big SSDs can be expensive but think big and think free because you could be the lucky winner of one of three 1TB Samsung SSD 840 EVO drives that we’re giving away worth over £300 apiece.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.