Hello,
A good news for the laptop users, Michael Larabel at Phoronix discovered
the
source of the major power regression found in the Linux 2.6.38 kernel:
the biggest cause of the 2.6.38 power issue (according to my testing software and the
hardware I've been running) is due to a change in behavior regarding ASPM. ASPM is the
Active-State Power Management for PCI Express. Namely, to blame is commit
2f671e2dbff6eb5ef4e2600adbec550c13b8fe72 that is titled "PCI: Disable ASPM if BIOS
asks us to."
Given the thousands of users having this 2.6.38 power regression by this change, there is
a big ASPM problem at hand. Fortunately, as PCI-E ASPM problems are not new, a few boot
options can be used. Namely, most people affected by this issue will want to add
"pcie_aspm=force" to their boot command line.
http://www.phoronix.com/scan.php?page=article&item=linux_2638_aspm&num=1
--
Best Regards,
Sorin Toma
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