linux-kernel - Re: [PATCH] samsung-laptop: Set keyboard backlight initially

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Date:	Mon, 24 Dec 2012 13:55:30 +0100
From:	Roland Stigge <stigge@...com.de>
To:	Corentin Chary <corentin.chary@...il.com>
CC:	gregkh@...uxfoundation.org, Matthew Garrett <mjg@...hat.com>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] samsung-laptop: Set keyboard backlight initially

On 24/12/12 09:41, Corentin Chary wrote:
> On Sun, Dec 23, 2012 at 6:21 PM, Roland Stigge <stigge@...com.de> wrote:
>> After boot, /sys/devices/platform/samsung/leds/samsung::kbd_backlight/brightness
>> shows the maximum value (8) by readout, but the led is off. I need to manually
>> set it to the respective value to have keyboard backlight.
> 
> If the led is set to 0, what's the value after reboot ? 0 or 8 ?

Right - when writing 0 there before restart, the led value is actually 8
after reboot, and the LED hardware is ON. This holds for both reboot and
halt+poweron cycle.

Maybe this is related to the "#define MAX_BRIGHT 0x07" (which is unused
in samsung-laptop.c)? A bit confusing in the code - but your question
hints for some other bug (to be solved differently). Tell me if I can
help somehow, here.

> What's the behavior on windows ?

There is no windows available on this machine.

Thanks,

Roland
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