ASPM for E3C246D4U

[tdatta]

Im trying to get to higher c-states. 

I have spent some time going through the BIOS to enable ASPM on as many PCIE items as I can find. But I am struggling with addressing all of them. 

 

 

As you can see the ones with ASPM disabled are root ports 10 and 17 and also the AST1150 PCI-to-PCI bridge. 

In the BIOS port 10 has the same settings as the rest (ASPM enabled), and port 17 is delegated to USB/SATA and I have no control options. For the PCI bridge, I am unsure what settings to change. In general I enter the BIOS with ctrl+alt+f3, I wonder if this is complicating things by making too many options available. 

 

Powertop shows nothing higher that C3 for the package. Note that I have a Vm with blue iris running when this snapshot was taken. If that VM is not running the package C3 percentage can hit ~50%.

 

 

and it also shows a number of devices at 100%

 

Any assistance would be greatly appreciated.

Edited March 15, 2023 by tdatta
correct model numner for AST1150

[tdatta]

Ok, so I went through the bios and disabled a number of things.

And then I forcibly set ASPM for all that had is disabled by setting the PCI link control registers manually.

This yields the following output:

Interestingly this "allowed" me to set L1 for a device which claims it doesnt support ASPM (port #17 above).

Yet now when I go through powertop I still dont see any states above C3 for the package

 

Any thoughts on this?