https://bugzilla.kernel.org/show_bug.cgi?id=51531
Summary: pcie_aspm: unable to enable ASPM when battery powered
Product: ACPI
Version: 2.5
Kernel Version: 3.6.9
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Other
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
On my Clevo W150HRM laptop (i7 2720QM CPU, HM65 chipset; please see dmidecode
output for details) with the 3.5.7 kernel, by echoing "powersave" to
/sys/module/pcie_aspm/parameters/policy I could turn PCIE ASPM on; I noticed
that with the 3.6.9 kernel this works only when the power supply is connected:
when on battery power it has no effect at all.
I still have to test previous 3.6 minor releases, but I have a feeling that all
3.6 releases are equally affected.
I'm running with pcie_aspm=force to overcome the "ACPI _OSC support
notification failed, disabling PCIe ASPM" issue.
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