linux-kernel - Re: [PATCH 11/15] samsung-laptop: add keyboard backlight support

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Date:	Wed, 23 Nov 2011 17:41:55 +0100
From:	David Herrmann <dh.herrmann@...glemail.com>
To:	Corentin Chary <corentin.chary@...il.com>
Cc:	Greg KH <gregkh@...e.de>, platform-driver-x86@...r.kernel.org,
	Matthew Garrett <mjg@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/15] samsung-laptop: add keyboard backlight support

On Wed, Nov 23, 2011 at 7:35 AM, Corentin Chary
<corentin.chary@...il.com> wrote:
> On Tue, Nov 22, 2011 at 11:23 PM, Greg KH <gregkh@...e.de> wrote:
>> On Tue, Nov 22, 2011 at 11:02:42PM +0100, Corentin Chary wrote:
>>> Signed-off-by: Corentin Chary <corentincj@...aif.net>
>>
>> What happens on boxes that don't have this type of hardware?  Will the
>> LED device still show up, yet it will not work?
>>
>> You should be able to trigger this off of the model type somehow, much
>> like the video backlight should work.
>
> kbd_backlight_enable(samsung) will be called, it will fire a {0x78,
> 0xaabb} command on machines using swsmi and this command will fail if
> the feature is not available. I did some test, and unknown commands
> seems to fail gracefully, and that makes sabi_command() (and callers)
> return -EINVAL).
>
> It think {0x78, 0x80} is also here to tell if the backlight is
> available or not, but I can't test it, since it always returns 1 here.

I do not have a keyboard backlight and hence always get an error
message on boot up. It would be great to suppress this error message
as this is not really an error (for me):
samsung_laptop: SABI command 0x0078 failed with completion flag 0xaa

> So yeah, if someone could test that on a swsmi laptop without keyboard
> backlight, that would be great.
> --
> Corentin Chary
> http://xf.iksaif.net
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