Re: Lenovo Yoga 13 touchpad regression

Kevin Cernekee
2013-05-07T06:05:11Z

On Mon, May 6, 2013 at 10:25 PM, H. Peter Anvin <hpa@zytor.com> wrote:
> Hello,
>
> The touchpad on Lenovo Yoga 13 seems to have broken some time between 3.4
> and the current kernel. The dmesg is full of spewage:
>
> [ 256.246481] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it
> known.
> [ 256.251473] atkbd serio0: Unknown key released (translated set 2, code
> 0xbe on isa0060/serio0
>
> ... about once per second; I am wondering if the touchpad is spewing output
> onto the keyboard channel or if there is something else wrong.

>From googling around this looks like a Synaptics unit.

Is it being detected by the ALPS driver? If so, did it use the ALPS
driver in 3.4?

alps.c was changed to identify several new models, but PS/2 touchpad
identification uses "magic knock sequences" which may be prone to
false positives. This is something we should watch for.