Cannot move touchpad by less than ~50 pixels at a time

[Anders Kaseorg]

I have a Lenovo Y50 UHD (3840×2160) with a ETPS/2 Elantech Touchpad. When I try to move the cursor by a very small amount (a few pixels), by slowly rolling my finger, there is no movement at all until I’ve moved at least 50 pixels or so. Then the cursor jumps* those 50 pixels all at once. If I continue moving my finger slowly, I can make nice pixel-by-pixel movements, so the touchpad clearly supports the required precision. But the initial jump makes it very frustrating to point at small targets that are close to the initial cursor location. I always have to move the cursor away, then move it back, then adjust to hit the target without lifting my finger.

I noticed the HorizHysteresis and VertHysteresis options, which default to 19 here, but reducing them has no effect.

* This initial jump is animated, even, which is frankly just insulting. It’s as if somebody noticed already this bug and tried to cover it up by making it look like the user’s fault!

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: xserver-xorg-input-synaptics 1.8.0-1~exp2ubuntu2
ProcVersionSignature: Ubuntu 3.16.0-12.18-generic 3.16.1
Uname: Linux 3.16.0-12-generic x86_64
NonfreeKernelModules: openafs
ApportVersion: 2.14.7-0ubuntu1
Architecture: amd64
Date: Wed Sep 3 13:20:24 2014
DistUpgraded: Fresh install
DistroCodename: utopic
DistroVariant: ubuntu
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-08-22 (12 days ago)
InstallationMedia: Ubuntu-GNOME 14.10 "Utopic Unicorn" - Alpha amd64 (20140730)
MachineType: LENOVO 20349
ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.16.0-12-generic.efi.signed root=/dev/mapper/fcntl-ubuntu ro rootflags=subvol=@ quiet splash init=/lib/systemd/systemd vt.handoff=7
SourcePackage: xserver-xorg-input-synaptics
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/27/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 9ECN26WW(V1.09)
dmi.board.asset.tag: 31900058Std
dmi.board.name: Lenovo Y50-70 Touch
dmi.board.vendor: LENOVO
dmi.board.version: 31900058Std
dmi.chassis.asset.tag: 31900058Std
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Y50-70 Touch
dmi.modalias: dmi:bvnLENOVO:bvr9ECN26WW(V1.09):bd05/27/2014:svnLENOVO:pn20349:pvrLenovoY50-70Touch:rvnLENOVO:rnLenovoY50-70Touch:rvr31900058Std:cvnLENOVO:ct10:cvrLenovoY50-70Touch:
dmi.product.name: 20349
dmi.product.version: Lenovo Y50-70 Touch
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.56-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.2.6-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.2.6-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Wed Sep 3 13:20:00 2014
xserver.configfile: default
xserver.errors:
 intel: Failed to load module "dri3" (module does not exist, 0)
 intel: Failed to load module "present" (module does not exist, 0)
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 18514
 vendor SDC
xserver.version: 2:1.15.1-0ubuntu9

[penalvch (penalvch)]

Anders Kaseorg, thank you for reporting this and helping make Ubuntu better.

As per https://wiki.ubuntu.com/Releases your release is EOL.

If you have an issue in a supported release (ex. 16.04) please file a new report, and feel free to subscribe me to it.