linux-kernel - Re: [PATCH 2.6.21-rc4] hwmon: HP Mobile Data Protection System 3D ACPI driver

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Date:	Fri, 23 Mar 2007 22:55:19 +0200
From:	Yan Burman <burman.yan@...il.com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	linux-kernel@...r.kernel.org, khali@...ux-fr.org
Subject: Re: [PATCH 2.6.21-rc4] hwmon: HP Mobile Data Protection System 3D
 ACPI driver

Dmitry Torokhov wrote:
> Hi Yan,
>
> On 3/23/07, Yan Burman <burman.yan@...il.com> wrote:
>> +
>> +static unsigned int input_3d;
>> +module_param(input_3d, bool, S_IRUGO);
>> +MODULE_PARM_DESC(input_3d, "Operate as a 3D joystick instead of 2D");
>
> Why do you need that? Just have the driver always report all 3 events
> and have applications decide if they want to use ABS_Z events...
>
Getting the coordinates goes through ACPI, so it eats up CPU. I think I 
remember seeing
up to 15-16% CPU usage with all 3 events.
That is why you probably want to disable it in most cases.
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