Higher power consumption in Debian than in Ubuntu - ASPM disabled instead of enabled for 2 modules (lspci), but why?

[B.M.]

Dear all,

Comparing power consumption with powertop for a brand new Dell laptop I found
out that Debian is consuming about 6 Watts while Ubuntu is consuming 3 Watts
(idle). Comparing configs I just found out that lspci -vv reports ASPM enabled
6 x for Ubuntu and 4 x for Debian. The differences are:

Ubuntu:
Non-Volatile memory controller
ASPM L1 Enabled
Kernel driver in use: nvme

PCI bridge: Intel Corp 12th Gen....
ASPM L1 Enabled
Kernel driver in use: pcieport

Debian:
Non-Volatile memory controller
ASPM Disabled
Kernel driver in use: nvme

PCI bridge: Intel Corp 12th Gen....
ASPM Disabled
Kernel driver in use: pcieport

So the exact same driver is been used and I didn't find any config within /etc/
modprobe.d or /etc/modules or /etc/modules-load.d with respect to these
modules.

Do you have an idea why this happens (same computer, so BIOS settings should
have no impact)?

Thank you very much.

Best regards,
Bernd

[B.M.]

OK, problem solved: with the boot parameter pcie_aspm=force I get the very
same 3 W with Debian as with Ubuntu :-)

Best,
Bernd