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[Jesse Sung <1218166@xxxxxxxxxxxxxxxxxx>]

Re-installed 12.04.2 and found that:

* On a fresh installed 12.04.2 with kernel 3.5.0-23, edge scroll works.
* After a system upgrade, kernel bumped to 3.5.0-40, and edge scroll stops working.
* Use the same file system above and boot with 3.5.0-23, edge scroll works again.

Something between 3.5.0-23 and 3.5.0-40 breaks the edge scroll support.

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https://bugs.launchpad.net/bugs/1218166

Title:
  [Dell XPS 13] Horizontal/Vertical scrolling feature on touchpad does
  not work.

Status in “linux” package in Ubuntu:
  In Progress

Bug description:
  CID: 201209-11840 Dell XPS 13

  Both of the edge scrolling feature (horizontal and vertical) does not
  work on this system.

  ubuntu@201209-11840:~$ xinput list
  ⎡ Virtual core pointer                    	id=2	[master pointer  (3)]
  ⎜   ↳ Virtual core XTEST pointer              	id=4	[slave  pointer  (2)]
  ⎜   ↳ CyPS/2 Cypress Trackpad                 	id=12	[slave  pointer  (2)]
  ⎣ Virtual core keyboard                   	id=3	[master keyboard (2)]
      ↳ Virtual core XTEST keyboard             	id=5	[slave  keyboard (3)]
      ↳ Power Button                            	id=6	[slave  keyboard (3)]
      ↳ Video Bus                               	id=7	[slave  keyboard (3)]
      ↳ Power Button                            	id=8	[slave  keyboard (3)]
      ↳ Sleep Button                            	id=9	[slave  keyboard (3)]
      ↳ Laptop_Integrated_Webcam_1.3M           	id=10	[slave  keyboard (3)]
      ↳ AT Translated Set 2 keyboard            	id=11	[slave  keyboard (3)]
      ↳ Dell WMI hotkeys                        	id=13	[slave  keyboard (3)]

  There is no E7 value in dmesg, and the only EC value is:
  ubuntu@201209-11840:~$ cat /var/log/dmesg| grep EC
  [    0.156762] ACPI: EC: Look up EC in DSDT
  [    0.181523] ACPI: EC: GPE = 0x17, I/O: command/status = 0x66, data = 0x62

  This problem does not exist in 12.04.2

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.8.0-29-generic 3.8.0-29.42~precise1 [modified: boot/vmlinuz-3.8.0-29-generic]
  ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  Date: Wed Aug 28 22:40:56 2013
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lts-raring
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k3.8.0-29-generic.
  ApportVersion: 2.0.1-0ubuntu17.4
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC275 Analog [ALC275 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1558 F.... pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xd0510000 irq 45'
     Mixer name	: 'Intel PantherPoint HDMI'
     Components	: 'HDA:10ec0275,1028058b,00100008 HDA:80862806,80860101,00100000'
     Controls      : 29
     Simple ctrls  : 11
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=7cf28595-73f5-41ba-b4a2-c7839c56eaec
  InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 (20130820.1)
  MachineType: Dell Inc. Dell System XPS L322X
  MarkForUpload: True
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic.efi.signed root=UUID=f0ed3242-8409-4aac-b950-6e8b8cd1ff74 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.8.0-29.42~precise1-generic 3.8.13.5
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-29-generic N/A
   linux-backports-modules-3.8.0-29-generic  N/A
   linux-firmware                            1.79.6
  Tags:  precise running-unity
  Uname: Linux 3.8.0-29-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 04/18/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A08
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA08:bd04/18/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS L322X
  dmi.sys.vendor: Dell Inc.

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