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From:   Alain Michaud <alainmichaud@google.com>
Date:   Wed, 22 Jan 2020 16:48:32 -0500
Message-ID: <CALWDO_VC2z8ZxCQM0EBWvkEWJRQKaVy0butAeRc+uUqhpGcyMw@mail.gmail.com>
Subject: Re: [Bluez PATCH] doc: Add definition for Set Kernel Debug Level
To:     Johan Hedberg <johan.hedberg@gmail.com>
Cc:     Marcel Holtmann <marcel@holtmann.org>,
        Alain Michaud <alainm@chromium.org>,
        BlueZ <linux-bluetooth@vger.kernel.org>
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Thanks for your patience.  After further research dynamic_debug is not
available on retail chromium os user systems for a variety of reasons,
some of which you can find in this trail:
https://bugs.chromium.org/p/chromium/issues/detail?id=188825.

Given we need to be able to diagnose things in the field, this is not
a good option for this.

I hope this helps explain or justify the need for this interface.

Thanks!
Alain

On Tue, Jan 21, 2020 at 1:37 PM Alain Michaud <alainmichaud@google.com> wrote:
>
> Thanks, we'll check it out, please consider this patch as abandoned for now.
>
> On Tue, Jan 21, 2020 at 1:33 PM Johan Hedberg <johan.hedberg@gmail.com> wrote:
> >
> > Hi Alain,
> >
> > On 21. Jan 2020, at 20.25, Alain Michaud <alainmichaud@google.com> wrote:
> > > I'm not familiar with the dynamic_debug feature.
> > >
> > > On ChromiumOS, the interface proposed here is used by the user
> > > feedback system to allow the collection of BT_DBG output when the user
> > > is trying to send us feedback.  If there is a better way to do this,
> > > we can certainly use that. but may need to be pointed in the right
> > > direction.
> >
> > I think Marcel is referring to this:
> >
> > https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html
> >
> > Johan