Public bug reported:

Since the X transition in precise, scrolling is very erratic. When I
activate edge scrolling on my touchpad, the content I'm scrolling often
jumps by an unpredictable and large amount in either direction, before
scrolling correctly.

Other people have reported the same issue with mouse scrollwheels too,
so it doesn't seem to be touchpad specific.

This is easily triggered by using either of the other touchpad buttons
before scrolling. If I activate a scroll without touching any other
buttons, then it appears to work correctly.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xorg 1:7.6+10ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-12.20-generic 3.2.2
Uname: Linux 3.2.0-12-generic x86_64
.tmp.unity.scope.cities: Error: [Errno 21] Is a directory: 
'/tmp/unity-scope-cities'
.tmp.unity.support.test.0:
 
ApportVersion: 1.91-0ubuntu1
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,regex,snap,move,resize,gnomecompat,mousepoll,grid,place,imgpng,unitymtgrabhandles,animation,session,workarounds,wall,fade,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Thu Feb  2 23:01:13 2012
DistUpgraded: Log time: 2011-11-16 16:59:15.521011
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 02) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:040a]
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901)
MachineType: Dell Inc. Latitude E6410
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
PlymouthDebug: Error: [Errno 13] Permission denied: 
'/var/log/plymouth-debug.log'
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-12-generic 
root=UUID=b2e419c9-361b-45c5-8964-3ee8ca387122 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to precise on 2011-11-16 (78 days ago)
dmi.bios.date: 02/15/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A07
dmi.board.name: 04373Y
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA07:bd02/15/2011:svnDellInc.:pnLatitudeE6410:pvr0001:rvnDellInc.:rn04373Y:rvrA03:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6410
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu8
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.11.3-0ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901-1ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug compiz-0.9 precise regression reproducible 
running-unity single-occurrence ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/925785

Title:
  Starting to scroll is erratic

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/925785/+subscriptions

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