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walterw

touchpad not working on Dell 7490 laptop

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Hi all,

I am having difficulty getting the touchpad working on my laptop - if I boot up to Ubuntu, it works fine.  I played around with removing modules to semi isolate which modules I need and have deduced that I need at least:

i2c_hid

hid_multitouch

 

When I remove those on Ubuntu, the touchpad stops working.  However, merely having those built and available on my funtoo installation is insufficient.  I also tried copying the xorg.conf.d/*.conf files for anything resembling input devices and that also did not work (after restarting X11).

I will play around more with other kernel modules.  I am trying to dig through lspci to see if I'm missing something but it isn't entirely clear to me, perhaps this might be what I need support:

Communication Controller: Intel Corporation Point-LP CSME HECI #1

SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)

 

Thanks,

Walter

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First thing that jumped to mind was the phrase "Xorg synaptics". I recall, when I had a laptop ages ago, that not having synaptic driver in xorg can cause havoc.
A quick google brought this up - https://wiki.gentoo.org/wiki/Synaptics
There is the later/newer libinput - https://wiki.gentoo.org/wiki/Libinput
I'm not sure if these will solve your problems, but identify the need for the driver(correctly we hope) in /etc/portage/make.conf may pull in what you are missing.

YMMV - https://forums.gentoo.org/viewtopic-t-1075806-start-0.html

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Hi digifuzzy,

Good call - I think you are most certainly right, I checked and I do not have x11-drivers/xf86-input-synaptics installed, nor the use flags with synaptics (which probably pulls that in).  I'm building now and will report back :).

 

Thanks,

 

Walter

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I've got a 7490 too, and I do not have synpatics installed as everything works fine with libinput only.

To get the stickpoint and touchpad working, enabling HID_ALPS in my kernel config did the trick.

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Hi gingerbread,

I set that, rebuilt my kernel, modules, and installed it, but I still have no touchpad.  I did have to manually modprobe hid-alps as it wasn't loaded by default; however, manually loading it had no impact.  I am wondering if perhaps it would work if there were a corresponding x11 config file somewhere telling it to use it?

But I am also not sure that matters because my /proc/bus/input/devices doesn't show any touchpad devices.

I believe it works in Ubuntu, so I will have to keep comparing what the kernel supports versus what I have built in my kernel ...

 

Thanks,

Walter

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