ASPM (Active-State Power Management) is used to manage the power consumption of PCI Express buses, even if the PCIe device is in use and may affect the device’s response delay.
default – the power parameters that are specified in the BIOS are used.
powersave – maximum energy saving.
performance – maximum performance, disabling ASPM.
The current and available modes can be seen in the file:
You can disable ASPM when starting the operating system by specifying “pcie_aspm=off” in the /etc/default/grub file:
nano /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="pcie_aspm=off" update-grub reboot
pcie_aspm=force allows you to force the power saving mode, but if the device does not support ASPM, then the operating system may freeze.
See also my article:
Changing CPU Scaling Governor on Linux