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 -- To unsubscribe from this list: send the line "unsubscribe linux-input" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
