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

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Message-ID: <47e2af96-1b97-6654-e65c-eea570383abb@angelsl.xyz>
Date:   Sun, 11 Jun 2017 13:07:07 +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 10:05 PM, Hao Wei Tee wrote:
> 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.

Any thoughts on this?

-- 
Hao Wei