This bug was erroneously marked for verification in bionic; verification
is not required and verification-needed-bionic is being removed.

** Tags removed: verification-needed-bionic
** Tags added: kernel-fixup-verification-needed-bionic verification-done-bionic

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https://bugs.launchpad.net/bugs/1728244

Title:
  Touchpad stops working after reboot on Apollo Lake

Status in Linux:
  Confirmed
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Bionic:
  Fix Released

Bug description:
  ===SRU Justification===
  Hantick touchpad stops working after reboot.

  [Fix]
  Disable runtime power management for the touchpad.

  [Test]
  User confirmed it fixed the issue.
  Some users reported it doesn't work for them, I'll ask them to file new
  bugs for different touchpads.

  [Regression Potential]
  Low. Disable runtime power management doesn't affect devivce's
  funtionality. In general desktop usage the graphical session opens the
  touchpad HID device so the touchpad never get runtime suspended, so it
  won't hurt power in this case.

  ===Original Bug Report===
  On the Jumper EZBook 3 Pro (V4) laptop, using an Apollo Lake N3450 processor, 
if you install Ubuntu 17.10 (or less) with isorespin and use rEFInd as 
bootloader (this is the only way to get linux booting on this laptop) 
everything works out of the box, but after a reboot or two the touchpad stops 
working. Both in Ubuntu and Windows 10. The only way to restore functionality 
is to boot from usb key ubuntu 17.10 respined, or disassemble laptop and 
detach-reattach battery cable. This is mesg | grep i2c_hid:

  [ 2056.460636] i2c_hid i2c-SYNA3602:00: i2c_hid_get_input: incomplete report 
(27/34)
  [ 3077.604699] i2c_hid i2c-SYNA3602:00: failed to reset device.
  [ 3077.605473] dpm_run_callback(): i2c_hid_resume+0x0/0xe0 [i2c_hid] returns 
-61
  [ 3080.468156] i2c_hid i2c-SYNA3602:00: i2c_hid_get_input: incomplete report 
(27/34)

  uname -rvps
  Linux 4.10.0-32-generic #36~16.04.1-Ubuntu SMP Wed Aug 9 09:19:02 UTC 2017 
x86_64

  There has to be a bug in the kernel. Any way to avoid this?

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