linux-kernel - Re: [PATCH] Remove ambiguous logging for "Unsupported brightness interface"

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Date:	Wed, 27 Jan 2016 16:43:41 -0800
From:	Joe Perches <joe@...ches.com>
To:	Eric Curtin <ericcurtin17@...il.com>
Cc:	platform-driver-x86@...r.kernel.org,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Darren Hart <dvhart@...radead.org>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	ibm-acpi-devel@...ts.sourceforge.net
Subject: Re: [PATCH] Remove ambiguous logging for "Unsupported brightness
 interface"

On Thu, 2016-01-28 at 00:36 +0000, Eric Curtin wrote:
> On 27 January 2016 at 23:26, Joe Perches <joe@...ches.com> wrote:
> > On Wed, 2016-01-27 at 22:14 +0000, Eric Curtin wrote:
> > > Message gets logged on machines that are well supported.
[]
> > diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
[]
> > +       pr_info("detected %u brightness levels\n", bright_maxlvl + 1);
> >  }
> > 
> >  static int __init brightness_init(struct ibm_init_struct *iibm)
> 
> Maybe, but the other logging issues kinda mean something. There are
> many, many reports of people thinking their brightness interface is
> broken because of this logging message, when in reality the i915 driver
> supports their devices just fine as previously stated.

That's why I suggest changing it to show the number
of brightness levels detected on any device.