linux-kernel - Re: [PATCH 2/2] Revert "PCI/ASPM: Refactor L1 PM Substates Control Register programming"

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Date:   Sat, 4 Feb 2023 14:48:00 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     linux-pci@...r.kernel.org, Thomas Witt <kernel@...t.link>,
        Vidya Sagar <vidyas@...dia.com>, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH 2/2] Revert "PCI/ASPM: Refactor L1 PM Substates Control
 Register programming"

On Sat, Feb 04, 2023 at 06:45:25PM +0100, Lukas Wunner wrote:
> On Fri, Feb 03, 2023 at 04:48:20PM -0600, Bjorn Helgaas wrote:
> > Thomas Witt reported that 5e85eba6f50d ("PCI/ASPM: Refactor L1 PM Substates
> > Control Register programming") broke suspend/resume on a Tuxedo
> > Infinitybook S 14 v5, which seems to use a Clevo L140CU Mainboard.
> > 
> > The main symptom is:
> > 
> >   iwlwifi 0000:02:00.0: Unable to change power state from D3hot to D0, device inaccessible
> >   nvme 0000:03:00.0: Unable to change power state from D3hot to D0, device inaccessible
> > 
> > and the machine is only partially usable after resume.  It can't run dmesg
> > and can't do a clean reboot.  This happens on every suspend/resume cycle.
> > 
> > Revert 5e85eba6f50d until we can figure out the root cause.
> > 
> > Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=216877
> 
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=216877
> Fixes: 5e85eba6f50d ("PCI/ASPM: Refactor L1 PM Substates Control Register programming")
> Cc: stable@...r.kernel.org # v6.1+

It's a pattern ;)  Thanks again!