Touchpad toggle mess

Dmitry Torokhov dmitry.torokhov at
Thu Nov 4 19:20:05 PDT 2010

Hi Bastien,

On Fri, Nov 05, 2010 at 12:00:09AM +0000, Bastien Nocera wrote:
> Heya,
> In GNOME 2.32, we added support for touchpad toggle buttons, by
> capturing the XF86TouchpadToggle button in gnome-settings-daemon,
> showing a nice popup, and disabling the touchpad in software.
> That works great for a number of laptops, but completely breaks a number
> of others where the hardware handles the request, but still sends a key
> event (usually separate ones for on and off). In those cases, we'd need
> 2 more key types, in the kernel, and in

Rfkill story all over I guess ;(

> The patches in
> implement this for the kernel, and for
> Then we have the problem that udev's keymaps seem to use different
> function keys depending on the hardware [1], when (because of the
> limitations of XKB) standardised on F22 for "XF86TouchpadToggle".
> So we'll need to standardise on the keys used. I selected F21 for
> XF86TouchpadToggle, F22 for XF86TouchpadOn and F23 for XF86TouchpadOff.
> See the patch in:
> The remaining fixes would need to be in udev's keymaps, to set hardware
> handled keys to F22 and F23, and software ones to F21. Patch is attached
> for that.
> Questions, comments?

I still believe we need dedicated keycodes in kernel for that and make
sure that in-kernel maps use proper keycodes so that programs that do
not have the same limitations that X has could differentiate between
touchpad events and real F2* events. X can still continue to use f21, 22
and 23 (at least while it can't handle higher keycodes), and common
setups may rely on udev's facilities to remap the keys.



More information about the xorg mailing list