linux-kernel - Re: [PATCH] thinkpad_acpi: Add support for keyboard backlight

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Message-ID: <20160106084513.GA11364@pali>
Date:	Wed, 6 Jan 2016 09:45:13 +0100
From:	Pali Rohár <pali.rohar@...il.com>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Darren Hart <dvhart@...radead.org>,
	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fabio D'Urso <fabiodurso@...mail.it>
Subject: Re: [PATCH] thinkpad_acpi: Add support for keyboard backlight

On Wednesday 30 December 2015 23:28:48 Pali Rohár wrote:
> On Monday 28 December 2015 15:48:14 Pali Rohár wrote:
> > > Also, is it working properly across suspend+resume?
> > 
> > When doing resume from suspend or hibernate BIOS turning keyboard
> > backlight automatically off.
> 
> Fixed in v2.
> 

Now I see that BIOS try to be too intelligent and automatically turn of
keyboard backlight when LID is closed. When LID is open again then
keyboard backlight stay turned off. Sysfs show correct state (brightness
is zero).

Should thinkpad acpi driver do something? Or let BIOS do that job?

-- 
Pali Rohár
pali.rohar@...il.com
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