Re: [PATCH] PCI/ASPM: Add back L1 PM Substate save and restore

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Hi Thomas,

On Tue, Jun 27, 2023 at 11:53:33AM +0200, Thomas Witt wrote:
> On 27/06/2023 08:24, Mika Westerberg wrote:
> > Commit a7152be79b62 ("Revert "PCI/ASPM: Save L1 PM Substates Capability
> > for suspend/resume"") reverted saving and restoring of ASPM L1 Substates
> > due to a regression that caused resume from suspend to fail on certain
> > systems. However, we never added this capability back and this is now
> > causing systems fail to enter low power CPU states, drawing more power
> > from the battery.
> 
> Hello Mika,
> 
> I am sorry, but your patch (applied on top of master) triggers the exact
> same behaviour I described in
> <https://bugzilla.kernel.org/show_bug.cgi?id=216877> (nvme and wifi become
> unavailable during suspend/resume)

Thanks for testing! Can you provide the output of dmidecode from that
system? We can add it to the denylist as well to avoid the issue on your
system.



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