（EE）入力デバイスが多すぎるため、USBマウスは無視されました。直し方？
USBマウスはしばらくすると動作しなくなります（再起動すると時々修正されますが、（1）時々失敗し、（2）頻繁に再起動することは望んでいません）。 /var/log/Xorg.0.logをチェックした後、明らかにエラー（EE）メッセージを含む次の一連のメッセージが表示されます。
[ 82489.053] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82489.053] (II) No input driver specified, ignoring this device.
[ 82489.053] (II) This device may have been added with another device file.
[ 82489.146] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82489.146] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82489.146] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82489.146] (**) A4Tech USB Mouse: always reports core events
[ 82489.146] (**) Option "Device" "/dev/input/event261"
[ 82489.146] (**) Option "_source" "server/udev"
[ 82489.225] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82489.225] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82489.225] (II) event261 - A4Tech USB Mouse: device removed
[ 82489.264] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 82489.264] (II) UnloadModule: "libinput"
推測（ラップトップの電源管理ツールの削除など）を続けても、これまでのところ信頼できる治療法は見つかりませんでした。助言がありますか？
Ubuntu 18.04.1 LTS/Dell Latitude 3440/A4Tech N60-F
PDATE：別のUSBへの再接続はもちろん機能しません。 16.04でも問題は続いていました。
PDATE2：Sudo rmmod usbhid + Sudo modprobe usbhidは役に立ちません。
PDATE3：
$ grep -i mouse /var/log/Xorg.0.log
[ 20.301] (==) modeset(0): Silken mouse enabled
[ 20.601] (II) config/udev: Adding input device SynPS/2 Synaptics TouchPad (/dev/input/mouse0)
[ 199.907] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 199.966] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event9)
[ 199.966] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 199.966] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 199.966] (**) A4Tech USB Mouse: always reports core events
[ 200.040] (II) event9 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 200.041] (II) event9 - A4Tech USB Mouse: device is a pointer
[ 200.041] (II) event9 - A4Tech USB Mouse: device removed
[ 200.080] (II) XINPUT: Adding extended input device "A4Tech USB Mouse" (type: MOUSE, id 13)
[ 200.083] (**) A4Tech USB Mouse: (accel) selected scheme none/0
[ 200.083] (**) A4Tech USB Mouse: (accel) acceleration factor: 2.000
[ 200.083] (**) A4Tech USB Mouse: (accel) acceleration threshold: 4
[ 200.141] (II) event9 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 200.141] (II) event9 - A4Tech USB Mouse: device is a pointer
[ 62443.191] (II) config/udev: removing device A4Tech USB Mouse
[ 62443.191] (II) event9 - A4Tech USB Mouse: device removed
[ 82222.732] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82222.814] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82222.814] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82222.814] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82222.814] (**) A4Tech USB Mouse: always reports core events
[ 82222.872] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82222.872] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82222.872] (II) event261 - A4Tech USB Mouse: device removed
[ 82222.912] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 82233.442] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82233.552] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82233.552] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82233.552] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82233.552] (**) A4Tech USB Mouse: always reports core events
[ 82233.649] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82233.649] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82233.649] (II) event261 - A4Tech USB Mouse: device removed
[ 82233.680] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 82244.848] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82244.929] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82244.929] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82244.929] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82244.929] (**) A4Tech USB Mouse: always reports core events
[ 82245.008] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82245.008] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82245.008] (II) event261 - A4Tech USB Mouse: device removed
[ 82245.040] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 82282.414] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82282.485] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82282.485] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82282.485] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82282.485] (**) A4Tech USB Mouse: always reports core events
[ 82282.540] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82282.540] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82282.541] (II) event261 - A4Tech USB Mouse: device removed
[ 82282.584] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 82489.053] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82489.146] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82489.146] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82489.146] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82489.146] (**) A4Tech USB Mouse: always reports core events
[ 82489.225] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82489.225] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82489.225] (II) event261 - A4Tech USB Mouse: device removed
[ 82489.264] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 82802.434] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 82802.528] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 82802.528] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 82802.529] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 82802.529] (**) A4Tech USB Mouse: always reports core events
[ 82802.588] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 82802.588] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 82802.588] (II) event261 - A4Tech USB Mouse: device removed
[ 82802.624] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 84382.375] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 84382.477] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 84382.477] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 84382.477] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 84382.477] (**) A4Tech USB Mouse: always reports core events
[ 84382.537] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 84382.537] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 84382.537] (II) event261 - A4Tech USB Mouse: device removed
[ 84382.576] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 86931.932] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 86932.033] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 86932.033] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 86932.033] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 86932.033] (**) A4Tech USB Mouse: always reports core events
[ 86932.092] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 86932.092] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 86932.092] (II) event261 - A4Tech USB Mouse: device removed
[ 86932.132] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[ 87803.804] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse1)
[ 87803.901] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event261)
[ 87803.901] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[ 87803.901] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[ 87803.901] (**) A4Tech USB Mouse: always reports core events
[ 87803.960] (II) event261 - A4Tech USB Mouse: is tagged by udev as: Mouse
[ 87803.960] (II) event261 - A4Tech USB Mouse: device is a pointer
[ 87803.960] (II) event261 - A4Tech USB Mouse: device removed
[ 87803.996] (EE) Too many input devices. Ignoring A4Tech USB Mouse
PDATE4：Sudo modprobe -r psmouseを試した後、マウスは再び生きています（すぐではなく、30秒以上待つ必要がありました）が、タッチパッドは死んでいます。タッチパッドを復活させる方法を探しています。 grep -i mouse /var/log/Xorg.0.log（その末尾）の出力は次のとおりです。
[189654.285] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event489)
[189654.285] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[189654.285] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[189654.285] (**) A4Tech USB Mouse: always reports core events
[189654.344] (II) event489 - A4Tech USB Mouse: is tagged by udev as: Mouse
[189654.345] (II) event489 - A4Tech USB Mouse: device is a pointer
[189654.345] (II) event489 - A4Tech USB Mouse: device removed
[189654.384] (EE) Too many input devices. Ignoring A4Tech USB Mouse
[189689.204] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/mouse0)
[189689.296] (II) config/udev: Adding input device A4Tech USB Mouse (/dev/input/event6)
[189689.296] (**) A4Tech USB Mouse: Applying InputClass "libinput pointer catchall"
[189689.296] (II) Using input driver 'libinput' for 'A4Tech USB Mouse'
[189689.296] (**) A4Tech USB Mouse: always reports core events
[189689.356] (II) event6 - A4Tech USB Mouse: is tagged by udev as: Mouse
[189689.356] (II) event6 - A4Tech USB Mouse: device is a pointer
[189689.356] (II) event6 - A4Tech USB Mouse: device removed
[189689.396] (II) XINPUT: Adding extended input device "A4Tech USB Mouse" (type: MOUSE, id 12)
[189689.399] (**) A4Tech USB Mouse: (accel) selected scheme none/0
[189689.399] (**) A4Tech USB Mouse: (accel) acceleration factor: 2.000
[189689.399] (**) A4Tech USB Mouse: (accel) acceleration threshold: 4
[189689.457] (II) event6 - A4Tech USB Mouse: is tagged by udev as: Mouse
[189689.457] (II) event6 - A4Tech USB Mouse: device is a pointer
ターミナルで試してください：Sudo modprobe -r psmouse
ターミナルウィンドウを開き、次のコマンドを試して、タッチパッドを再度アクティブにします。
Sudo modprobe psmouse