在华硕 A450L 上暂停后触摸板不工作

Question

我最近将笔记本电脑更换为 asus A450L 并安装了最新的 ubuntu 15.04，有一个烦人的错误，挂起后触摸板无法工作，需要重新启动才能再次工作。

挂起后 xinput 中不存在触摸板，这是我挂起前的 xinput ：

? Virtual core pointer                      id=2    [master pointer  (3)]
?   ? Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
?   ? ETPS/2 Elantech Touchpad                  id=15   [slave  pointer  (2)]
? Virtual core keyboard                     id=3    [master keyboard (2)]
    ? Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ? Power Button                              id=6    [slave  keyboard (3)]
    ? Video Bus                                 id=7    [slave  keyboard (3)]
    ? Video Bus                                 id=8    [slave  keyboard (3)]
    ? Sleep Button                              id=9    [slave  keyboard (3)]
    ? USB2.0 HD UVC WebCam                      id=10   [slave  keyboard (3)]
    ? Asus WMI hotkeys                          id=13   [slave  keyboard (3)]
    ? AT Translated Set 2 keyboard              id=14   [slave  keyboard (3)]

这之后：

? Virtual core pointer                      id=2    [master pointer  (3)]
?   ? Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
? Virtual core keyboard                     id=3    [master keyboard (2)]
    ? Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ? Power Button                              id=6    [slave  keyboard (3)]
    ? Video Bus                                 id=7    [slave  keyboard (3)]
    ? Video Bus                                 id=8    [slave  keyboard (3)]
    ? Sleep Button                              id=9    [slave  keyboard (3)]
    ? USB2.0 HD UVC WebCam                      id=10   [slave  keyboard (3)]
    ? Asus WMI hotkeys                          id=13   [slave  keyboard (3)]
    ? AT Translated Set 2 keyboard              id=14   [slave  keyboard (3)]

使用此技巧在挂起前工作但在挂起后不工作：

sudo rmmod psmouse
sudo modprobe psmouse

还有其他解决方法吗？

[更新]

它甚至在休眠后再次工作（挂在磁盘上）。

:~$ dmesg | grep serio1
[    1.294732] psmouse serio1: alps: Unknown ALPS touchpad: E7=10 00 64, EC=10 00 64
[    1.793203] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x361f01)
[    1.806832] psmouse serio1: elantech: Synaptics capabilities query result 0x00, 0x15, 0x0c.
[    1.875780] input: ETPS/2 Elantech Touchpad as /devices/platform/i8042/serio1/input/input5
...after suspend no additional output.
...after hibernate touchpad redetected again.
[ 2704.226793] psmouse serio1: alps: Unknown ALPS touchpad: E7=10 00 64, EC=10 00 64
[ 2704.725799] psmouse serio1: elantech: assuming hardware version 4 (with firmware version 0x361f01)
[ 2704.739412] psmouse serio1: elantech: Synaptics capabilities query result 0x00, 0x15, 0x0c.
[ 2704.808346] input: ETPS/2 Elantech Touchpad as /devices/platform/i8042/serio1/input/input20