Comment 66 for bug 1504445

Thanks to Harris Anggara (harrisanggara) and Daniel Drake (dsdrake) here, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1490130 , I could solve my problem by adding this patch to the kernel :
https://marc.info/?l=linux-input&m=144312209020616&w=2

now i'm using kernel 4.2 for Ubuntu 14.04 with the patch. i changed the DMI_PRODUCT_NAME with K501LX (because that is my laptop model).

I tried directly with kernel 4.2 because before that, kernel 3.19 and so, they need a driver for my touchpad. I followed the instruction here to obtain the source of kernel 4.2 for Ubuntu 14.04, https://wiki.ubuntu.com/Kernel/Dev/KernelGitGuide
git clone git://kernel.ubuntu.com/ubuntu/ubuntu-trusty.git
then from inside the folder you've just downloaded (cd ubuntu-trusty)
git tag -l Ubuntu-*
to know what is available for ubuntu 14.04
and then
git checkout -f -b temp Ubuntu-lts-4.2.0-6.6_14.04.1.1

After, to build the kernel, I followed this explanation, https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel
fakeroot debian/rules clean
fakeroot debian/rules binary-headers binary-generic
then
cd ..
ls *.deb
    linux-cloud-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-headers-4.2.0-6_4.2.0-6.6~14.04.1.1_all.deb
    linux-headers-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-image-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-image-extra-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb

I deleted this two files because I don't need them
    linux-cloud-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
    linux-tools-4.2.0-6-generic_4.2.0-6.6~14.04.1.1_amd64.deb
and finally,
sudo dpkg -i linux*4.2.0-6.6~14.04.1.1*.deb
sudo reboot

Now it works nicely. The touchpad works fine, without the need to install any driver and I can suspend the activity of my computer and resume without loosing the touchpad. I hope the patch will be integrated soon and I won't loose my touchpad again with updates in the future.

Thank you everybody,
Take care, always smiling,