RE: Many reports of laptops getting hot while suspended with kernels >= 5.16.10 || >= 5.17-rc1

["Limonciello, Mario" <Mario.Limonciello@amd.com>]

[Public]



> -----Original Message-----
> From: Rafael J. Wysocki <rafael@kernel.org>
> Sent: Wednesday, March 16, 2022 08:46
> To: Limonciello, Mario <Mario.Limonciello@amd.com>
> Cc: Rafael J. Wysocki <rafael@kernel.org>; Hans de Goede
> <hdegoede@redhat.com>; Linux PM <linux-pm@vger.kernel.org>; Stable
> <stable@vger.kernel.org>; Justin Forbes <jmforbes@linuxtx.org>; Mark
> Pearson <markpearson@lenovo.com>; ACPI Devel Maling List <linux-
> acpi@vger.kernel.org>; Kai-Heng Feng <kai.heng.feng@canonical.com>
> Subject: Re: Many reports of laptops getting hot while suspended with
> kernels >= 5.16.10 || >= 5.17-rc1
> 
> On Wed, Mar 16, 2022 at 2:38 PM Limonciello, Mario
> <Mario.Limonciello@amd.com> wrote:
> >
> > [Public]
> >
> > > > Just FWIW this fix that was backported to stable also fixed keyboard
> > > > wakeup from s2idle on a number of HP laptops too.  I know for sure
> that
> > > > it fixed it on the AMD versions of them, and Kai Heng Feng suspected it
> > > > will also fix it for the Intel versions.  So if there is another commit
> > > > that can be backported from 5.17 to make it safer for the other
> systems,
> > > > I think we should consider doing that to solve it too.
> > >
> > > There is a series of ACPI EC driver commits that are present in
> > > 5.17-rc, but have not been included in any "stable" series:
> > >
> > > befd9b5b0c62 ACPI: EC: Relocate acpi_ec_create_query() and drop
> > > acpi_ec_delete_query()
> > > c33676aa4824 ACPI: EC: Make the event work state machine visible
> > > c793570d8725 ACPI: EC: Avoid queuing unnecessary work in
> > > acpi_ec_submit_event()
> > > eafe7509ab8c ACPI: EC: Rename three functions
> > > a105acd7e384 ACPI: EC: Simplify locking in acpi_ec_event_handler()
> > > 388fb77dcf97 ACPI: EC: Rearrange the loop in acpi_ec_event_handler()
> > > 98d364509d77 ACPI: EC: Fold acpi_ec_check_event() into
> > > acpi_ec_event_handler()
> > > 1f2350443dd2 ACPI: EC: Pass one argument to acpi_ec_query()
> > > ca8283dcd933 ACPI: EC: Call advance_transaction() from
> > > acpi_ec_dispatch_gpe()
> > >
> > > It is likely that they prevent the problem exposed by the problematic
> > > commit from occurring, but I'm not sure which ones do that.  Some of
> > > them are clearly cosmetic, but the ordering matters.
> >
> > Hans,
> >
> > Do you think you could get one of the folks who reported this regression to
> do
> > a bisect to see which one "fixed" it?  If we get lucky we can come down to
> > some smaller hunks of code that can come back to stable instead of
> reverting.
> 
> It's been reverted already.
> 
> What we can do is to request adding it back along with other commits
> needed for it to work as expected.

OK thanks, makes sense.

> 
> Also, I think we'll need all of the commits listed up to and including
> c793570d8725 ("ACPI: EC: Avoid queuing unnecessary work in
> acpi_ec_submit_event()") at least, but that's just a guess.

Yeah so we'll for sure need a bisect to confirm and come up with that list.