As I had mentionned in previous bug, problem still exists with latest
upstream.
Kernel tested: 
th0ma7@brutus:~$ uname -a
Linux brutus 3.15.0-031500rc2-generic #201404201435 SMP Sun Apr 20 18:36:18 UTC 
2014 x86_64 x86_64 x86_64 GNU/Linux

However I did noticed USB errors at boot time which seemed relevant:
[    4.078636] usb 2-6: device descriptor read/64, error -71
[    4.182641] xhci_hcd 0000:00:14.0: Setup ERROR: setup context command for 
slot 3.
[    4.182726] usb 2-6: hub failed to enable device, error -22
[    4.406874] usb 2-6: device descriptor read/64, error -71
[    4.510833] xhci_hcd 0000:00:14.0: Setup ERROR: setup context command for 
slot 4.
[    4.510919] usb 2-6: hub failed to enable device, error -22
[    5.031131] usb 2-6: device not accepting address 6, error -71
[    5.551425] usb 2-6: device not accepting address 7, error -71


** Attachment added: "Full 3.15-rc upstream kernel boot dmesg"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1312489/+attachment/4097612/+files/dmesg-3.15.0-rc2-upstream.txt

** Tags removed: amd64 apport-bug latest-bios-f.24 trusty
** Tags added: kernel-bug-exists-upstream

** Tags removed: kernel-bug-exists-upstream
** Tags added: kernel-bug-exists-upstream-3.15.0-rc2

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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Title:
  [HP Split 13-m110ca x2 PC] Touchpad not working

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