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Date: Sat, 18 Jun 2016 09:53:53 -0700
From: Greg KH <greg@kroah.com>
To: Marco Trevisan <mail@3v1n0.net>
Cc: stable@vger.kernel.org
Subject: Re: [PATCH] thinkpad_acpi: save kbdlight state on suspend and
 restore it on resume
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On Tue, May 31, 2016 at 07:02:53PM +0200, Marco Trevisan wrote:
> Backport for v4.5 and v4.6 of
> commit afcedebc6a094224973534f43b396bbbf33fe44e upstream.
> 
> Fixes resuming of keyboard backlight for ThinkPad laptops after suspension
> 
> 
> Override default LED class suspend/resume handles, by keeping track of
> the brightness level before suspending so that it can be automatically
> restored on resume by calling default resume handler.
> 
> Signed-off-by: Marco Trevisan (Trevi�o) <mail@3v1n0.net>
> Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
> Signed-off-by: Darren Hart <dvhart@linux.intel.com>
> ---
>  drivers/platform/x86/thinkpad_acpi.c | 43 +++++++++++++++++++++++++++++++++---
>  1 file changed, 40 insertions(+), 3 deletions(-)

This looks like a new feature to me, which isn't really stable material,
sorry.

greg k-h