I confirm the freeze when using the touchpad and the nVidia GPU on my nVidia Optimus laptop (specifications below). I thus went to nvidia- settings and selected "Intel (Power Saving Mode)" in the "PRIME Profiles". Now, "prime-select query" prints "intel", the bug does not bother me any more, and the laptop has far more battery life.
Hardware ------------- Lenovo ThinkPad T420s (4173-P41), see http://projektneptun.com/339.html $ grep -i touchpad /proc/bus/input/devices N: Name="SynPS/2 Synaptics TouchPad" $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 01:00.0 VGA compatible controller: NVIDIA Corporation GF119M [NVS 4200M] (rev ff) Software ------------ Ubuntu 14.04.1 LTS, 64 bit linux-generic kernel 3.13.0-32-generic $ apt-show-versions nvidia-prime nvidia-331 nvidia-settings ubuntu-drivers-common bbswitch-dkms libvdpau1 bbswitch-dkms:amd64/trusty 0.7-2ubuntu1 uptodate libvdpau1:amd64/trusty 0.7-1 uptodate nvidia-331:amd64/trusty-updates 331.38-0ubuntu7.1 uptodate nvidia-prime:amd64/trusty 0.6.2 uptodate nvidia-settings:amd64/trusty 331.20-0ubuntu8 uptodate ubuntu-drivers-common:amd64/trusty-updates 1:0.2.91.7 uptodate -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-prime in Ubuntu. https://bugs.launchpad.net/bugs/1220426 Title: [nvidia-prime]Freeze while using touchpad Status in “nvidia-graphics-drivers-319” package in Ubuntu: Triaged Status in “nvidia-graphics-drivers-331” package in Ubuntu: Triaged Status in “nvidia-graphics-drivers-343” package in Ubuntu: Triaged Status in “nvidia-prime” package in Ubuntu: Triaged Bug description: I'm using an Optimus laptop (Asus N43SL) nvidia-prime is installed, so my nvidia dedicated graphics card (GT 540m) is in use. Once in a while, my screen will freeze, only when I use my touchpad. This does not happen with my USB mouse. This does not happen either when I uninstall nvidia-prime and use my intel integrated graphics (HD3000). I can temporarily solve the issue by doing a VT switch. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-drivers-319/+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
