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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => In Progress

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1630238

Title:
  [regression 4.8.0-14 -> 4.8.0-17] keyboard and touchscreen lost on
  Acer Chromebook R11

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Xenial:
  In Progress
Status in linux source package in Yakkety:
  In Progress

Bug description:
  16.10 beta 2, as installed fresh, has working keyboard and touchscreen
  on my Acer Chromebook R11. However, after dist-upgrade they're lost,
  so touchscreen doesn't work and I need to use external keyboard.

  Looking at config diff, the likely culprit is:
  +CONFIG_PINCTRL_AMD=y
   CONFIG_PINCTRL_BAYTRAIL=y
  -CONFIG_PINCTRL_CHERRYVIEW=y
  -CONFIG_PINCTRL_INTEL=y
  -CONFIG_PINCTRL_BROXTON=y
  -CONFIG_PINCTRL_SUNRISEPOINT=y
  +CONFIG_PINCTRL_CHERRYVIEW=m
  +CONFIG_PINCTRL_INTEL=m
  +CONFIG_PINCTRL_BROXTON=m
  +CONFIG_PINCTRL_SUNRISEPOINT=m

  As indicated at https://github.com/GalliumOS/galliumos-
  distro/issues/270, " in the GalliumOS 4.7.2 kernel we needed to add
  CONFIG_PINCTRL_CHERRYVIEW=y (must be y, not m) in addition to
  CONFIG_TOUCHSCREEN_ELAN to get the touchscreen working on CYAN.".

  So, the change of Intel related PINCTRLs (specifically the CHERRYVIEW one) to m instead of y causes at least the touchscreen regression, and probably the keyboard one too.
  --- 
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  timo       1922 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 16.10
  InstallationDate: Installed on 2016-10-04 (0 days ago)
  InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Alpha amd64 (20160922)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2a Intel Corp. 
   Bus 001 Device 002: ID 0bda:57cf Realtek Semiconductor Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: GOOGLE Cyan
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-17-generic root=UUID=7f6c179e-9a4c-4837-869e-0ef2f04a3d61 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7
  RelatedPackageVersions:
   linux-restricted-modules-4.8.0-17-generic N/A
   linux-backports-modules-4.8.0-17-generic  N/A
   linux-firmware                            1.161
  Tags:  yakkety
  Uname: Linux 4.8.0-17-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 08/21/2016
  dmi.bios.vendor: coreboot
  dmi.chassis.type: 3
  dmi.chassis.vendor: GOOGLE
  dmi.modalias: dmi:bvncoreboot:bvr:bd08/21/2016:svnGOOGLE:pnCyan:pvr1.0:cvnGOOGLE:ct3:cvr:
  dmi.product.name: Cyan
  dmi.product.version: 1.0
  dmi.sys.vendor: GOOGLE

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