linux-kernel - Re: [PATCH v4 1/1] asus-wmi: Add support for custom fan curves

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Date:   Fri, 20 Aug 2021 13:39:02 +0200
From:   Bastien Nocera <hadess@...ess.net>
To:     Luke Jones <luke@...nes.dev>
Cc:     linux-kernel@...r.kernel.org, hdegoede@...hat.com,
        platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v4 1/1] asus-wmi: Add support for custom fan curves

On Fri, 2021-08-20 at 23:00 +1200, Luke Jones wrote:
> 
> 
> On Fri, Aug 20 2021 at 12:51:08 +0200, Bastien Nocera 
> <hadess@...ess.net> wrote:
> > On Fri, 2021-08-20 at 12:43 +0200, Bastien Nocera wrote:
> > >  On Fri, 2021-08-20 at 22:33 +1200, Luke Jones wrote:
> > >  > > Am I going to get bug reports from Asus users that will
> > > complain
> > >  > > that
> > >  > > power-profiles-daemon doesn't work correctly, where I will
> > > have
> > >  > > to
> > >  > > wearily ask if they're using an Asus Rog laptop?
> > >  >
> > >  > No. Definitely not. The changes to fan curves per-profile need
> > > to
> > >  > be
> > >  > explicitly enabled and set. So a new user will be unaware that
> > > this
> > >  > control exists (until they look for it) and their laptop will
> > >  > behave
> > >  > exactly as default.
> > > 
> > >  "The user will need to change the fan curves manually so will
> > >  definitely remember to mention it in bug reports" is a very 
> > > different
> > >  thing to "the user can't change the fan curves to be nonsensical
> > > and
> > >  mean opposite things".
> > > 
> > >  I can assure you that I will eventually get bug reports from
> > > "power
> > >  users" who break their setup and wonder why things don't work
> > >  properly,
> > >  without ever mentioning the changes they made changes to the fan
> > >  curves, or anything else they might have changed.
> > 
> > A way to taint the settings that power-profiles-daemon could catch
> > would be fine by me. I absolutely don't want to have to support
> > somebody's tweaks until they undo them.
> 
> Definitely understood. Do you have something in mind?

A sysfs attribute with boolean data that shows whether custom fan
curves are used would be enough.

I could then check whether that file exists on startup, and throw a
warning if custom curves are used, or become used, so that it shows up
in power-profiles-daemon's logs.