Going around impossibility of enabling ASPM

[Lockheed]

Adding pcie_aspm=force to kernel line doesn't work (any longer?) on recent kernels. This was the only known to me way of enabling it (please, do tell, if you know another one).

The result is the unavoidable

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$ dmesg | grep ASPM
[    0.000000] PCIe ASPM is forcibly enabled
[    0.094612] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it

I can also confirm it with

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$ cat /sys/module/pcie_aspm/parameters/policy
default [performance] powersave

which means it's disabled.


However, I can change this value with

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$ echo default > /sys/module/pcie_aspm/parameters/policy
$ cat /sys/module/pcie_aspm/parameters/policy
[default] performance powersave 

The question is, does it actually enable ASPM, or does it just change the text value, leaving ASPM still inactive.

[twistero]

Try editing the PCI registry directly with setpci to enable ASPM. http://forum.notebookreview.com/hardwar ... ption.html