用libinput代替synaptics驱动的Touchpad

Question

我的联想x230上的触摸屏没有运行synaptics驱动程序，我需要它增加功能。相反，它使用的是libinput。我怎样才能让synaptics驱动程序在引导时获得优先权？

触摸屏是(xinput list)：

⎜   ↳ PS/2 Synaptics TouchPad                   id=13   [slave  pointer  (2)]

我可以检查它在grep -i "Using input driver" /var/log/Xorg.0.log中使用的驱动程序：

(II) Using input driver 'libinput' for 'PS/2 Synaptics TouchPad'

但是，我确实安装了synaptics驱动程序(sudo apt install xserver-xorg-input-synaptics)：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
xserver-xorg-input-synaptics is already the newest version (1.9.0-1ubuntu1).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

我可以在libinput驱动程序(ls /usr/share/X11/xorg.conf.d/)旁边看到synaptics驱动程序的配置文件：

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

我的结论是synaptics和libinput都安装了驱动程序，但出于某种原因，libinput具有更高的优先级。这是令人困惑的，因为我的理解是，/usr/share/X11/xorg.conf.d/中配置文件的数量越多，优先级就越高，这意味着应该选择synaptics。

我怎样才能让synaptics运行呢？到目前为止，我试图将synaptics.conf文件移动到/etc/X11/xorg.conf.d，因为我看到这个目录有更高的优先级，但这是行不通的。/var/log/Xorg.0.log的相关部分是

[     7.718] (II) config/udev: Adding input device PS/2 Synaptics TouchPad (/dev/input/event5)
[     7.718] (**) PS/2 Synaptics TouchPad: Applying InputClass "libinput pointer catchall"
[     7.718] (II) Using input driver 'libinput' for 'PS/2 Synaptics TouchPad'
[     7.718] (**) PS/2 Synaptics TouchPad: always reports core events
[     7.718] (**) Option "Device" "/dev/input/event5"
[     7.718] (**) Option "_source" "server/udev"
[     7.719] (II) event5  - PS/2 Synaptics TouchPad: is tagged by udev as: Mouse
[     7.719] (II) event5  - PS/2 Synaptics TouchPad: device is a pointer
[     7.719] (II) event5  - PS/2 Synaptics TouchPad: device removed
[     7.748] (**) Option "config_info" "udev:/sys/devices/platform/i8042/serio1/input/input5/event5"
[     7.748] (II) XINPUT: Adding extended input device "PS/2 Synaptics TouchPad" (type: MOUSE, id 13)
[     7.748] (**) Option "AccelerationScheme" "none"
[     7.748] (**) PS/2 Synaptics TouchPad: (accel) selected scheme none/0
[     7.748] (**) PS/2 Synaptics TouchPad: (accel) acceleration factor: 2.000
[     7.748] (**) PS/2 Synaptics TouchPad: (accel) acceleration threshold: 4
[     7.749] (II) event5  - PS/2 Synaptics TouchPad: is tagged by udev as: Mouse
[     7.749] (II) event5  - PS/2 Synaptics TouchPad: device is a pointer
[     7.749] (II) config/udev: Adding input device PS/2 Synaptics TouchPad (/dev/input/mouse0)
[     7.749] (II) No input driver specified, ignoring this device.
[     7.750] (II) This device may have been added with another device file.

它引用的另一个设备文件是什么？在哪里选择libinput作为触屏驱动程序，如何选择synaptics？

编辑:我的libinput版本是

kp@kvnp:~$ libinput --version
1.10.4

似乎只有一种滚动方法可用：

kp@kvnp:~$ xinput list-props 16
Device 'PS/2 Synaptics TouchPad':
    Device Enabled (150):   1
    Coordinate Transformation Matrix (152): 1.000000, 0.000000, 0.000000, 0.000000, 1.000000, 0.000000, 0.000000, 0.000000, 1.000000
    libinput Natural Scrolling Enabled (285):   1
    libinput Natural Scrolling Enabled Default (286):   0
    libinput Scroll Methods Available (289):    0, 0, 1
    libinput Scroll Method Enabled (290):   0, 0, 1
    libinput Scroll Method Enabled Default (291):   0, 0, 1
    libinput Button Scrolling Button (292): 2
    libinput Button Scrolling Button Default (293): 2
    libinput Middle Emulation Enabled (294):    1
    libinput Middle Emulation Enabled Default (295):    0
    libinput Accel Speed (296): 0.000000
    libinput Accel Speed Default (297): 0.000000
    libinput Accel Profiles Available (298):    1, 1
    libinput Accel Profile Enabled (299):   1, 0
    libinput Accel Profile Enabled Default (300):   1, 0
    libinput Left Handed Enabled (301): 0
    libinput Left Handed Enabled Default (302): 0
    libinput Send Events Modes Available (270): 1, 0
    libinput Send Events Mode Enabled (271):    0, 0
    libinput Send Events Mode Enabled Default (272):    0, 0
    Device Node (273):  "/dev/input/event5"
    Device Product ID (274):    2, 1
    libinput Drag Lock Buttons (287):   
    libinput Horizontal Scroll Enabled (288):   1

当我试图让两个手指在libinput中滚动时，我得到了以下输出：

kp@kvnp:~$ xinput set-prop 16 290 1 0 0 
X Error of failed request:  BadValue (integer parameter out of range for operation)
  Major opcode of failed request:  131 (XInputExtension)
  Minor opcode of failed request:  57 ()
  Value in failed request:  0x122
  Serial number of failed request:  19
  Current serial number in output stream:  20

Answer 1

我知道这个线程是旧的，但是最近我在更新到Ubuntu20.04LTS之后遇到了同样的问题。

我通过改变/usr/share/X11/xorg.conf.d/中的synaptics号优先级来解决这个问题。

在我的例子中，这是命令ls -1 /usr/share/X11/xorg.conf.d/的输出

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

我使用命令将70-synaptics.conf更改为30-synaptics.conf

mv 70-synaptics.conf 30-synaptics.conf

这给了它比40-libinput.conf更高的优先级。一定要以根用户的身份执行此操作。然后是reboot。