如何将TrackPoint驱动程序从默认的libinput更改为较新的libinput或返回到Synaptics？

Question

TrackPoint的运动在这个ThinkPad X390与Ubuntu18.04LTS是跳跃，滞后和不能用于微妙的，小的动作。我已经确认这可能是一个软件问题，因为我已经用TrackPoint测试了一个外部键盘，它在16.04很好，但在18.04上显示了相同的问题。

我可以在网上看到一些评论，这些评论表明，将libinput转换到一个更新的版本会有帮助，而从libinput到Synaptics的切换也会有所帮助。怎样才能做到后者呢？从这里中可以看出，安装xserver-xorg-input-synaptics是一种可能，但是，当我这样做时，会遇到一些问题：

$ sudo apt install xserver-xorg-input-synaptics
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies.
 xserver-xorg-input-synaptics : Depends: xserver-xorg-core (>= 2:1.18.99.901)
E: Unable to correct problems, you have held broken packages.

$ sudo apt install xserver-xorg-core
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libunity-gtk2-parser0 libunity-gtk3-parser0 libxatracker2 unity-gtk-module-common xinput
Use 'sudo apt autoremove' to remove them.
Suggested packages:
  xfonts-100dpi | xfonts-75dpi
The following packages will be REMOVED
  ubuntu-desktop ubuntu-mate-core ubuntu-mate-desktop ubuntu-unity-desktop xorg
  xserver-xorg-core-hwe-18.04 xserver-xorg-hwe-18.04 xserver-xorg-input-all-hwe-18.04
  xserver-xorg-input-libinput-hwe-18.04 xserver-xorg-input-synaptics-hwe-18.04
  xserver-xorg-input-wacom-hwe-18.04 xserver-xorg-video-all-hwe-18.04
  xserver-xorg-video-amdgpu-hwe-18.04 xserver-xorg-video-ati-hwe-18.04
  xserver-xorg-video-fbdev-hwe-18.04 xserver-xorg-video-intel-hwe-18.04
  xserver-xorg-video-nouveau-hwe-18.04 xserver-xorg-video-qxl-hwe-18.04
  xserver-xorg-video-radeon-hwe-18.04 xserver-xorg-video-vesa-hwe-18.04
  xserver-xorg-video-vmware-hwe-18.04
The following NEW packages will be installed
  xserver-xorg-core
0 to upgrade, 1 to newly install, 21 to remove and 11 not to upgrade.
Need to get 1,351 kB of archives.
After this operation, 5,808 kB disk space will be freed.
Do you want to continue? [Y/n] n
Abort.

怎样才能继续下去？

编辑:根据@Pilot6 6 这里的建议，我安装了xserver-xorg-input-synaptics-hwe-18.04 (看起来很成功)，并检查了目录/usr/share/X11/xorg.conf.d中的文件：

10-amdgpu.conf
10-quirks.conf
10-radeon.conf
40-libinput.conf
51-synaptics-quirks.conf
70-synaptics.conf
70-wacom.conf

我删除了文件40-libinput.conf并重新启动，希望Synaptics驱动程序能够启动。它没有这样做，导致键盘和TrackPoint (和触摸屏)没有响应。幸运的是，触摸屏和屏幕上的键盘能够替换文件40-libinput.conf。我不知道下一步该怎么办。

40-libinput.conf的内容如下：

# Match on all types of devices but joysticks
Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput keyboard catchall"
        MatchIsKeyboard "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput touchpad catchall"
        MatchIsTouchpad "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput touchscreen catchall"
        MatchIsTouchscreen "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

Section "InputClass"
        Identifier "libinput tablet catchall"
        MatchIsTablet "on"
        MatchDevicePath "/dev/input/event*"
        Driver "libinput"
EndSection

70-synaptics.conf的内容如下：

# Example xorg.conf.d snippet that assigns the touchpad driver
# to all touchpads. See xorg.conf.d(5) for more information on
# InputClass.
# DO NOT EDIT THIS FILE, your distribution will likely overwrite
# it when updating. Copy (and rename) this file into
# /etc/X11/xorg.conf.d first.
# Additional options may be added in the form of
#   Option "OptionName" "value"
#
Section "InputClass"
        Identifier "touchpad catchall"
        Driver "synaptics"
        MatchIsTouchpad "on"
# This option is recommend on all Linux systems using evdev, but cannot be
# enabled by default. See the following link for details:
# http://who-t.blogspot.com/2010/11/how-to-ignore-configuration-errors.html
      MatchDevicePath "/dev/input/event*"
EndSection

Section "InputClass"
        Identifier "touchpad ignore duplicates"
        MatchIsTouchpad "on"
        MatchOS "Linux"
        MatchDevicePath "/dev/input/mouse*"
        Option "Ignore" "on"
EndSection

# This option enables the bottom right corner to be a right button on clickpads
# and the right and middle top areas to be right / middle buttons on clickpads
# with a top button area.
# This option is only interpreted by clickpads.
Section "InputClass"
        Identifier "Default clickpad buttons"
        MatchDriver "synaptics"
        Option "SoftButtonAreas" "50% 0 82% 0 0 0 0 0"
        Option "SecondarySoftButtonAreas" "58% 0 0 15% 42% 58% 0 15%"
EndSection

# This option disables software buttons on Apple touchpads.
# This option is only interpreted by clickpads.
Section "InputClass"
        Identifier "Disable clickpad buttons on Apple touchpads"
        MatchProduct "Apple|bcm5974"
        MatchDriver "synaptics"
        Option "SoftButtonAreas" "0 0 0 0 0 0 0 0"
EndSection

Answer 1

对于HWE安装，命令如下

sudo apt install xserver-xorg-input-synaptics-hwe-18.04

您可以通过删除synaptics文件切换到/usr/share/X11/xorg.conf.d/XX-libinput.conf驱动程序。

Answer 2

因此，在@ have的建议之后，我从默认情况下升级了libinput，这似乎大大改进了一些事情。程序如下：

sudo apt install check doxygen libev-dev python3-sphinx
sudo pip3 install recommonmark sphinx_rtd_theme    
git clone https://gitlab.freedesktop.org/libinput/libinput
cd libinput
meson --prefix=/usr builddir/
ninja -C builddir/
sudo ninja -C builddir/ install
sudo systemd-hwdb update

然后是重新启动。