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[Gabriele <1245328@xxxxxxxxxxxxxxxxxx>]

I did the same test once and because of my lazyness I just saw that the
pressure and the width were not completely uncorrelated. I didn't
analyze the result of my tests carefully and just assumed that what I
read on the emails I linked was correct (or at least my interpretation
of them).

Anyway, I did the same test once more and obtained your same result:
http://pastebin.com/raw.php?i=7SZupHuz

At this point, I really don't know the reason of why ABS_TOOL_WIDTH is
not reported.

I guess that opening a bug report on https://bugzilla.kernel.org/ will
clear all the doubts. This is an upstream kernel bug after all.

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https://bugs.launchpad.net/bugs/1245328

Title:
  Synaptics kernel driver does not report finger width information,
  breaking usermode driver's palm detection

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  While doing some work on the Xorg synaptics driver, I noticed that we
  never actually detect palm blocking even after running synclient
  PalmDetect=1. Digging in a bit, the driver claims in its capability
  bits that it should be sending ABS_TOOL_WIDTH records, but according
  to evtest(1), the driver never sends these advertised records to
  userspace. As a result, the Xorg synaptics driver never sees
  hw->fingerWidth become non-zero in SynapticsDetectFinger and never
  detects that I've mashed my palm into the large touchpad on this
  machine.

  Expected:

  Kill X. Run evtest(1). Select touchpad device. Move touchpad. See
  ABS_TOOL_WIDTH records in the event stream.

  Actual:

  No ABS_TOOL_WIDTH records even though the device claims to support
  them in its capability bits.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19 [modified: boot/vmlinuz-3.11.0-12-generic]
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dancol     2258 F.... pulseaudio
  Date: Sun Oct 27 21:43:01 2013
  HibernationDevice: RESUME=UUID=7da7377a-42c7-49f8-a060-8dee466c61fd
  InstallationDate: Installed on 2013-10-23 (4 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO 34601F5
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/29/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G6ET96WW (2.56 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 34601F5
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: 2059198
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG6ET96WW(2.56):bd04/29/2013:svnLENOVO:pn34601F5:pvrThinkPadX1Carbon:rvnLENOVO:rn34601F5:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 34601F5
  dmi.product.version: ThinkPad X1 Carbon
  dmi.sys.vendor: LENOVO

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