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["Edward Z. Yang" <ezyang@xxxxxxxxxxxxxxx>]

Using the original workaround (not comment #8), I have gotten back Wacom
input, and it is preserved across sleep. So maybe the updated udevs rule
is not right either. I haven't tested it. I had to reboot to put the new
rule into action.

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https://bugs.launchpad.net/bugs/1392887

Title:
  serial wacom devices gone after upgrade to utopic/14.10

Status in xf86-input-wacom package in Ubuntu:
  Triaged

Bug description:
  Recently I upgraded ubuntu from 14.04 to 14.10 on my HP EliteBook 2760p. After that, all serial wacom devices (for the touchscreen) are gone:
     serial wacom stylus
     serial wacom eraser
     serial wacom touch

  xinput -list and xsetwacom --list don't show these devices and the
  Wacom Tablet section of the system setings reports 'no tablet
  detected' rather than showing the usual settings. Booting with the old
  linux 3.13 kernel makes no difference to the new version 3.16.

  To find out what happened I played around on a spare partition with the following results:
  1) fresh installation of 14.10 - result is the same like reported above: no touch devices
  2) fresh installation of 14.04 - touch works out of the box
  3) upgraded the fresh installation of trusty to utopic: touch devices gone again
  4) manually changed repos to utopic after fresh installation of 14.04 and updated ONLY the xserver-xorg-input-wacom package: apt pulled some dependencies and installed without errors, touch devices gone (so it reproduces the error exactly as the full upgrade)

  WORKAROUND: Replace the udev rule /lib/udev/rules.d/69-wacom.rules/wacom.rules by the old file from Ubuntu 14.04 by putting it in /lib/udev/rules.d/ :
  https://bugs.launchpad.net/ubuntu/+source/xf86-input-wacom/+bug/1392887/+attachment/4264135/+files/69-xserver-xorg-input-wacom.rules

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xserver-xorg-input-wacom 1:0.25.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Nov 14 22:51:05 2014
  DistUpgraded: 2014-11-01 04:28:11,674 DEBUG enabling apt cron job
  DistroCodename: utopic
  DistroVariant: ubuntu
  InstallationDate: Installed on 2012-10-16 (759 days ago)
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
  MachineType: Hewlett-Packard HP EliteBook 2760p
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic root=UUID=81ff9b66-4d33-49d5-a76f-cf1418c3e354 ro quiet splash vt.handoff=7
  SourcePackage: xf86-input-wacom
  UpgradeStatus: Upgraded to utopic on 2014-11-01 (13 days ago)
  dmi.bios.date: 08/04/2014
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68SOU Ver. F.50
  dmi.board.name: 162A
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 05.40
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68SOUVer.F.50:bd08/04/2014:svnHewlett-Packard:pnHPEliteBook2760p:pvrA0005F02:rvnHewlett-Packard:rn162A:rvrKBCVersion05.40:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 2760p
  dmi.product.version: A0005F02
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Fri Nov 14 21:19:38 2014
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               22337
   vendor                                     SEC
  xserver.version: 2:1.16.0-1ubuntu1

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