Public bug reported: [Impact]
* Touchpad using libinput behaves badly. It's imprecise for small movements, the cursor jumps from one point to another, movements seem to take a while to register, etc., specially if compared to the Synaptics driver that was used in Xenial. Since users will upgrade from Xenial to Bionic, this can be regarded as a regression. * A regression that can make several touchpads behave very, very badly, is not something to be desired. Even more for a LTS release that'll be the "flagship" for new users for a whole 2 years. * The only working solution is reverting back to the Synaptics driver. * libinput 1.11 (and 1.11.1) fixes this. In this release, Peter Hutterer analysed the acceleration code from macOS and Windows and was able to replicate it in libinput. I've tested it in Fedora, upgrading from 1.10.5 to 1.11 and the difference is simply massive. No more missed clicks, no more imprecise movements. It behaves like in macOS. * On top of that, numerous bugs here in launchpad related to hysteresis and sensitivity and problems with specific models will be fixed as a consequence, too. [Test Case] * Get a laptop with a touchpad * Install Ubuntu 16.04.4, which uses the Synaptics driver, or Windows, or macOS. Make some small movements. * Now install Ubuntu 18.04, which uses libinput. Check that the touchpad is much less responsive, or sometimes even unusable due to how it behaves in small movements. Use it for an extended period of time. * This issue is specially pronounced in Elantech touchpads, in my experience. [Regression Potential] * Like any big upgrade, this can bring some problems. It seems there weren't any major ones, judging by other distros' bug trackers, as well as libinput's official bug tracker. * It should spend a lot of time in proposed or be considered for backporting only, and we should allow users to test it a lot, if possible. * libinput 1.11.1 has a bug (https://gitlab.freedesktop.org/libinput/libinput/issues/50) that can make some touchpads not appear in the device listing. Maybe we should wait for libinput 1.11.2, or use the code as of this commit: https://gitlab.freedesktop.org/libinput/libinput/commit/7c51c881dc72827ca50ae9eea3d123eef9cb4a66 [Other Info] * Users who do report problems are a minority. Even then, there are several instances of users complaining about these issues in the forums and AskUbuntu. ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: libinput10 1.10.4-1 ProcVersionSignature: Ubuntu 4.15.0-23.25-generic 4.15.18 Uname: Linux 4.15.0-23-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.2 Architecture: amd64 BootLog: Error: [Errno 13] Permissão negada: '/var/log/boot.log' CompositorRunning: None CurrentDesktop: KDE Date: Thu Jun 21 10:47:22 2018 DistUpgraded: Fresh install DistroCodename: bionic DistroVariant: ubuntu DkmsStatus: nvidia, 390.48, 4.15.0-23-generic, x86_64: installed GraphicsCard: Intel Corporation HD Graphics 620 [8086:5916] (rev 02) (prog-if 00 [VGA controller]) Subsystem: Dell HD Graphics 620 [1028:0781] Subsystem: Dell GM108M [GeForce 940MX] [1028:0781] InstallationDate: Installed on 2018-06-21 (0 days ago) InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) Lsusb: Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 004: ID 0cf3:e007 Atheros Communications, Inc. Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller Bus 001 Device 002: ID 0bda:5769 Realtek Semiconductor Corp. Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub MachineType: Dell Inc. Inspiron 7460 ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.15.0-23-generic root=/dev/mapper/kubuntu--vg-root ro quiet splash nouveau.runpm=0 vt.handoff=1 SourcePackage: libinput UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/31/2018 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.5.4 dmi.board.name: 0V736W dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.5.4:bd01/31/2018:svnDellInc.:pnInspiron7460:pvr:rvnDellInc.:rn0V736W:rvrA01:cvnDellInc.:ct10:cvr: dmi.product.family: Inspiron dmi.product.name: Inspiron 7460 dmi.sys.vendor: Dell Inc. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.91-2 version.libgl1-mesa-dri: libgl1-mesa-dri 18.1.1-0~b~padoka0 version.libgl1-mesa-glx: libgl1-mesa-glx 18.1.1-0~b~padoka0 version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20171229-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2 ** Affects: libinput (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug bionic ubuntu -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to libinput in Ubuntu. https://bugs.launchpad.net/bugs/1778072 Title: [SRU or Backport][Bionic] Touchpad is imprecise for small movements, keeps missing clicks, the cursor jumps after being stopped for a while. Upgrade to libinput 1.11 fixes it. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1778072/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
