linux-kernel - Re: [PATCH v2] platform: x86: dell-laptop: Add support for keyboard backlight

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Date:	Wed, 3 Dec 2014 03:51:37 -0800
From:	Darren Hart <dvhart@...radead.org>
To:	Gabriele Mazzotta <gabriele.mzt@...il.com>
Cc:	Pali Rohár <pali.rohar@...il.com>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	libsmbios-devel@...ts.us.dell.com, Srinivas_G_Gowda@...l.com,
	Michael_E_Brown@...l.com
Subject: Re: [PATCH v2] platform: x86: dell-laptop: Add support for keyboard
 backlight

On Thu, Dec 04, 2014 at 09:50:02AM +0100, Gabriele Mazzotta wrote:
> On Wednesday 03 December 2014 00:43:21 Darren Hart wrote:
> > > +     int kbd_timeouts[];
> > >
> > >  };
> > >  
> > >  static struct quirk_entry *quirks;
> > >
> > > @@ -76,6 +89,10 @@ static int __init dmi_matched(const struct
> > > dmi_system_id *dmi)>
> > >       return 1;
> > >  }
> > >  
> > >
> > > +static struct quirk_entry quirk_dell_xps13_9333 = {
> > > +     .kbd_timeouts = { 0, 5, 15, 60, 5*60, 15*60, -1 },
> > 
> > Where did these values come from? Were they documented in the
> > libsmbios project? Can you provide a URL to that? These really should
> > be described by the firmware, but if they aren't, nothing we can do
> > about it.
> 
> I took those values from a Windows utility provided by Dell. I tried
> to find a reason for that specific list to exist, but I couldn't. The
> reason why it's there is that the BIOS of my laptop accepts any timeout,
> but it silently sets the timeout to 0 (i.e. illumination never off)
> if a value not in that list is given. So, given the wide range of
> of possible input values, we added that quirk. This is something my
> laptop does, Pali's behaves differently and such a list is not needed.

Let's get a comment above the quirk describing the scenario.


-- 
Darren Hart
Intel Open Source Technology Center
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