Re: Problems with Elantech touchpad in 3.18-rc2

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Hi Roel,

On Thu, Oct 30, 2014 at 06:14:09PM +0100, Roel Aaij wrote:
> Dear kernel input developers,
> 
> While trying out 3.18-rc2, I noticed that the Elantech touchpad on my
> laptop didn't work as intended anymore. Mouse movement and tapping one
> finger worked, but scrolling and two finger tapping did not. X.org also
> didn't recognise the touchpad as a synaptics touchpad anymore.
> 
> After googling around I found that i8042.nomux=0 brought it back to normal.
> 
> My laptop is a Clevo model W650SH with a keyboard and a touchpad attached,
> and no touchschreen. Some output of dmesg is listed at the bottom, and the
> result of dmidecode is attached.

Argh, so quick search shows that there might be quite a few clones of
W650SH floating around, and I wonder if any of W650SF/W650SJ/W670SJQ/
W650SR/W650SZ exhibit the same behavior.

We might need to revert the nomux back to the original setting, although
I really do not want to do this: in my opinion it is better to have
touchpad revert to basic mode on affected laptops and work on
re-enabling MUX on them instead of having touchpad/keyboard completely
hosed from the get-go.

Linus, any guidance here? Can we live with such regression?

Thanks.

-- 
Dmitry