From: Seth Forshee <seth.forshee@canonical.com>
To: Chase Douglas <chase.douglas@canonical.com>,
Randy Dunlap <rdunlap@xenotime.net>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>, linux-input@vger.kernel.org
Subject: Re: disable touchpad?
Date: Fri, 24 Feb 2012 16:37:52 -0600 [thread overview]
Message-ID: <20120224223752.GA9883@ubuntu-macmini> (raw)
In-Reply-To: <4F480EBA.7020509@canonical.com>
On Fri, Feb 24, 2012 at 02:27:06PM -0800, Chase Douglas wrote:
> On 02/24/2012 01:31 PM, Dmitry Torokhov wrote:
> >On Friday, February 24, 2012 12:04:04 PM Randy Dunlap wrote:
> >>(b) My Toshiba Portege laptop has a touchpad on/off button. Is that
> >>supported?
> >
> >Kernel probably emits one of KEY_TOUCHPAD_* for it; whether it is handled
> >in userspace I do not know.
>
> I have heard from some of our engineers who have looked into this
> that the interface for these buttons is not standardized. Sometimes
> the buttons turn off the touchpad in hardware. Sometimes they emit
> events that tell the OS to turn it off, and the OS needs to know how
> to handle it.
>
> On top of that, LEDs are sometimes there to tell you if the trackpad
> is on or off. These are also not standardized. Sometimes they are
> hooked up to the hardware, and when the hardware is off they go off.
> Sometimes they are just a plain old LED and the OS needs to turn it
> on and off.
>
> Fun...
I've worked with a few Toshibas, and while there's quite a bit of
variation within Toshiba models, all the ones I've seen report a key
event rather than disabling the touchpad in firmware. Some of them
report the key on the AT keyboard while others use a Toshiba-specific
ACPI interface.
Randy, if you can't find a key event currently being emitted on your
machine, I have some patches for toshiba_acpi to enable hotkeys for some
Toshibas [1]. You might give them a try.
Seth
[1] https://lkml.org/lkml/2012/1/18/328
next prev parent reply other threads:[~2012-02-24 22:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-24 20:04 disable touchpad? Randy Dunlap
2012-02-24 21:31 ` Dmitry Torokhov
2012-02-24 22:27 ` Chase Douglas
2012-02-24 22:37 ` Seth Forshee [this message]
2012-02-25 1:49 ` Randy Dunlap
2012-02-24 22:55 ` Dmitry Torokhov
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