linux-kernel - Re: [PATCH] platform/x86: ideapad-laptop: Expose conservation mode switch

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Message-ID: <7ba76865-7fb2-615a-8bcd-35e14b862a8e@angelsl.xyz>
Date:   Tue, 30 May 2017 22:05:01 +0800
From:   Hao Wei Tee <angelsl@...elsl.xyz>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Platform Driver <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Ike Panhc <ike.pan@...onical.com>
Subject: Re: [PATCH] platform/x86: ideapad-laptop: Expose conservation mode
 switch

On 5/30/17 9:22 PM, Andy Shevchenko wrote:
> On Sun, May 28, 2017 at 4:47 PM, Hao Wei Tee <angelsl@...elsl.xyz> wrote:
>> On 5/27/17 3:31 PM, Hao Wei Tee wrote:
>>> This exposes the battery conservation mode present on some (?) IdeaPads.
>>> The mode is set by calling ACPI method SBMC with argument 3 (on) or
>>> 5 (off). Status is reported in bit 5 of the return value of ACPI method
>>> GBMD.
>>>
>>> This patch was written based on an IdeaPad U430p. I'm not sure if the ACPI
>>> methods are the same across all IdeaPads, so it would be great if this got more
>>> testing across other models before it's merged.
>>
>> I got someone to test on an IdeaPad Y510p. It works on that too.
> 
> Do we have any other option that expose something via sysfs?
> 

Sorry, not sure what you meant.

If you meant

> Do we have any other options than expose something via sysfs?

I'm not sure, maybe an ioctl? That wouldn't be very convenient though.

The tp_smapi module (not in mainline) that exposes the battery threshold
functionality for ThinkPads also uses sysfs.

If you meant

> Do we have any other options that expose something via sysfs?

yes, camera_power, fan_mode, touchpad and conservation_mode.

Hao Wei