I installed Ubuntu 14.10 on my Dell laptop, every time after log in for a while, the touchpad would stop working so I have to use my USB mouse, I've tried to run these commands after the touchpad stopped working:
# gconftool-2 --set --type boolean /desktop/gnome/peripherals/touchpad/touchpad_enabled true
# entxinput set-prop 14 "Device Enabled" 1
Some debug information:
root@ubt:~# xinput --list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ GlidePoint Virtual Touchpad id=14 [slave pointer (2)]
⎜ ↳ PixArt USB Optical Mouse id=11 [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)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Sleep Button id=9 [slave keyboard (3)]
↳ Laptop_Integrated_Webcam_HD id=10 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=12 [slave keyboard (3)]
↳ Dell WMI hotkeys id=13 [slave keyboard (3)]
Only a restart can solve this issue temporary.