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____/ Chris Ahlstrom on Wednesday 29 Jun 2011 11:34 : \____
> Roy Schestowitz wrote this copyrighted missive and expects royalties:
>
>> Kernel Log: BIOS bugs behind greater power use
>>
>> ,----[ Quote ]
>>Since version 2.6.38, kernels have used more power because, in certain
>>situations, they disable the power-saving ASPM feature. New stable and
>>long-term kernels offer corrections; however, one of them is conspicuously
>>lagging behind. In April, the Phoronix web site reported that some
>>systems require more power with Linux 2.6.35 and 2.6.38 than they did
>>with the previous versions. Phoronix says it has now found the reason for
>>the increased power consumption in 2.6.38.
>> `----
>>
>> http://www.h-online.com/open/features/Kernel-Log-BIOS-bugs-behind-greater-power-use-1269032.html
>
> However, in a large number of systems, the BIOS apparently provides
> incorrect ASPM support information via the FADT. From kernel version
> 2.6.38, all the PCIe lanes for communicating with PCIe chips are,
> therefore, permanently active in many of these systems, and it is this
> that has caused the increased power consumption many users have noticed.
>
> . . .
>
> That Linux actually approaches some situations more correctly than
> Windows is irrelevant: highly specification-compliant operational
> procedures coupled with inaccurate notebook BIOS ACPI tables have been
> among the causes of many ACPI problems that have troubled Linux users
> over the years. Things got better when the Linux ACPI interpreter began
> to imitate that of Windows, making some of the same mistakes ("bug
> compatibility").
>
> The coming days and weeks will show how the kernel hackers tackle the
> problem; however, a correction to re-enable ASPM in a larger number of
> systems will probably be part of Linux 3.1 at the earliest. Phoronix is
> still searching for the modification that has increased the kernel's
> power consumption since Linux 2.6.35.
>
> "Bug compatibility" <chuckle>
Fake leap year in OOXML? :-)
- --
~~ Best of wishes
Dr. Roy S. Schestowitz (Ph.D. Medical Biophysics), Imaging Researcher
http://Schestowitz.com | GNU/Linux administration | PGP-Key: 0x74572E8E
Editor @ http://techrights.org & Broadcaster @ http://bytesmedia.co.uk/
GPL-licensed 3-D Othello @ http://othellomaster.com
Non-profit search engine proposal @ http://iuron.com
Contact E-mail address (direct): s at schestowitz dot com
Contact Internet phone (SIP): schestowitz@xxxxxxxxx (24/7)
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