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

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Date:	Wed, 27 Jan 2016 15:26:51 -0800
From:	Joe Perches <joe@...ches.com>
To:	Eric Curtin <ericcurtin17@...il.com>,
	platform-driver-x86@...r.kernel.org
Cc:	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 Wed, 2016-01-27 at 22:14 +0000, Eric Curtin wrote:
> Message gets logged on machines that are well supported.
> 
> Signed-off-by: Eric Curtin <ericcurtin17@...il.com>
> ---
>  drivers/platform/x86/thinkpad_acpi.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/thinkpad_acpi.c
> b/drivers/platform/x86/thinkpad_acpi.c
> index a268a7a..4eb41aa 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -6661,7 +6661,6 @@ static void __init
> tpacpi_detect_brightness_capabilities(void)
>                 pr_info("detected a 8-level brightness capable
> ThinkPad\n");
>                 break;
>         default:
> -               pr_info("Unsupported brightness interface\n");
>                 tp_features.bright_unkfw = 1;
>                 bright_maxlvl = b - 1;
>         }

Perhaps this should be something like this instead:
---
 drivers/platform/x86/thinkpad_acpi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index a268a7a..bd12c71 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -6653,18 +6653,16 @@ static void __init tpacpi_detect_brightness_capabilities(void)
 	switch (b) {
 	case 16:
 		bright_maxlvl = 15;
-		pr_info("detected a 16-level brightness capable ThinkPad\n");
 		break;
 	case 8:
 	case 0:
 		bright_maxlvl = 7;
-		pr_info("detected a 8-level brightness capable ThinkPad\n");
 		break;
 	default:
-		pr_info("Unsupported brightness interface\n");
 		tp_features.bright_unkfw = 1;
 		bright_maxlvl = b - 1;
 	}
+	pr_info("detected %u brightness levels\n", bright_maxlvl + 1);
 }
 
 static int __init brightness_init(struct ibm_init_struct *iibm)