https://bugzilla.kernel.org/show_bug.cgi?id=67241
Bug ID: 67241
Summary: ASPM not working on Lenovo T440p
Product: ACPI
Version: 2.5
Kernel Version: 3.13rc3
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: BIOS
Assignee: acpi_b...@kernel-bugs.osdl.org
Reporter: nkalk...@web.de
Regression: No
Created attachment 118841
--> https://bugzilla.kernel.org/attachment.cgi?id=118841&action=edit
dmesg dump
Hello,
got a Lenovo T440p today with a i7-4600M cpu and I've noticed that power
comsumption is way up (17-19 Watts according to Powertop) even if the machine
is idle. Even my old T420 with a SNB i7 idles at only 7-8 Watts. I dug around
in the dmesg output and found something fishy:
[ 0.101907] ACPI FADT declares the system doesn't support PCIe ASPM, so
disable it
[ 0.256275] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM
Segments MSI]
[ 0.257724] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM
I guess this means that the kernel failed to enable ASPM. pcie_aspm=force
didn't help either. Could someone please look into it? I've attached dmesg,
acpidump and my kernel config.
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