linux-kernel - Re: [PATCH] Favor native backlight interface for ThinkPad Helix

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Date:	Tue, 08 Apr 2014 14:29:58 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Aaron Lu <aaron.lu@...el.com>
Cc:	Stephen Chandler Paul <thatslyude@...il.com>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Shawn Rutledge <shawn.t.rutledge@...il.com>
Subject: Re: [PATCH] Favor native backlight interface for ThinkPad Helix

On Tuesday, April 08, 2014 10:49:17 AM Aaron Lu wrote:
> On 04/04/2014 10:44 PM, Stephen Chandler Paul wrote:
> > Like many other Windows 8 laptops the ThinkPad Helix's backlight has a
> > broken ACPI interface and can only be properly adjusted by using the
> > video card's native backlight control. This adds the ThinkPad Helix to
> > the list of laptops affected with this issue so that
> > video.use_native_backlight is enabled by default.
> 
> It would be good to attach your acpidump so that we know for sure and if
> one day we need to remove this entry, we can verify its table.
> 
> Bug 51231 is tracking this problem and mostly are thinkpad laptops, so
> please attach your acpidump and dmi there, thanks.
> https://bugzilla.kernel.org/show_bug.cgi?id=51231

I've queued this patch up for the next ACPI pull request.  We'll revert it
if it turns out to be incorrect.

> > Signed-off-by: Stephen Chandler Paul <thatslyude@...il.com>
> > ---
> >  drivers/acpi/video.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/drivers/acpi/video.c b/drivers/acpi/video.c
> > index 48c7e8a..8b6990e 100644
> > --- a/drivers/acpi/video.c
> > +++ b/drivers/acpi/video.c
> > @@ -488,6 +488,14 @@ static struct dmi_system_id video_dmi_table[] __initdata = {
> >  		},
> >  	},
> >  	{
> > +	.callback = video_set_use_native_backlight,
> > +	.ident = "Thinkpad Helix",
> > +	.matches = {
> > +		DMI_MATCH(DMI_SYS_Vhttps://bugzilla.kernel.org/show_bug.cgi?id=51231ENDOR, "LENOVO"),
> > +		DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad Helix"),
> > +		},
> > +	},
> > +	{
> >  	 .callback = video_set_use_native_backlight,
> >  	 .ident = "Dell Inspiron 7520",
> >  	 .matches = {
> > 
> 
> --
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-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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