Same on Assus K555L with KDE, the problem stooped or at least occurs rarely when ever you stop the turn of touch pad functionality on key enter form synaptic touch pad set up in System Settings->Input Device->Touchpad->l. Enable/Disable touch. pad. And remove Disable touch pad when typing . Hope it helps.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg-server in Ubuntu. https://bugs.launchpad.net/bugs/1220426 Title: [nvidia-prime]Freeze while using touchpad Status in X.Org X server: Fix Released Status in xorg-server package in Ubuntu: Fix Released Status in xorg-server source package in Trusty: Triaged Bug description: Using Asus N43SL laptop as an example, with nvidia-prime installed, so the dedicated NVIDIA graphics card (GT 540m) is in use, once in a while, my screen will freeze when I use my touchpad. WORKAROUND: Use USB mouse. WORKAROUND: Uninstall nvidia-prime and use integrated graphics. WORKAROUND: Do a VT switch via Ctrl+Alt+F1 then Ctrl+Alt+F7. In the attached Xorg.0.log, you can see "synaptics: ETPS/2 Elantech Touchpad: touchpad found" each time I did a VT switch and regained control: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1220426/+attachment/3801516/+files/Xorg.0.log The following upstream report has a patch that addresses this issue: https://bugs.freedesktop.org/show_bug.cgi?id=86288 To manage notifications about this bug go to: https://bugs.launchpad.net/xorg-server/+bug/1220426/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp