On Fri, 2020-07-24 at 18:13 -0500, Bjorn Helgaas wrote: > > Maybe we should simplify this a little bit more. James, if you don't > touch ASPM config at all, either manually or via udev, does the ASPM > configuration stay the same across suspend/resume? > Yes, it stays the same. Explicitly: With the udev rule disabled, immediately following clean boot from power-off (and no additional tinkering), ASPM is OFF to the best of my knowledge: - link/l1_aspm in sysfs is 0 for PCI devices 0000:01:00.[01]; - the processor sleeps no deeper than package C3. The situation above is the same following a suspend/resume cycle -- both in terms of sysfs, and observed package C-state occupancy. [Tested on kernel 5.7.10, but the behaviour is the same as prior kernels.] Thanks, James.
