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[Renji T <1220426@xxxxxxxxxxxxxxxxxx>]

I have a Sager 8268-s / Clevo 150 running Ubuntu 14.10, nvidia 343 for
GTX 870M.

The screen freeze is guaranteed to happen. It seems to be triggered when
I am using the nvidia GPU and the touchpad. Using the Intel Graphics via
prime-select prevents the screen freeze. I don't know if touchpad
details would help with fixing this nvidia bug.

The touchpad is 
I: Bus=0011 Vendor=0002 Product=0007 Version=01b1
N: Name="SynPS/2 Synaptics TouchPad"
P: Phys=isa0060/serio2/input0
S: Sysfs=/devices/platform/i8042/serio2/input/input10
U: Uniq=
H: Handlers=mouse0 event14 
B: PROP=9
B: EV=b
B: KEY=6420 30000 0 0 0 0
B: ABS=260800011000003

01:00.0 VGA compatible controller: NVIDIA Corporation GK104M [GeForce GTX 870M] (rev a1) (prog-if 00 [VGA controller])
	Subsystem: CLEVO/KAPOK Computer Device 5281
	Flags: bus master, fast devsel, latency 0, IRQ 56
	Memory at f6000000 (32-bit, non-prefetchable) [size=16M]
	Memory at e0000000 (64-bit, prefetchable) [size=256M]
	Memory at f0000000 (64-bit, prefetchable) [size=32M]
	I/O ports at e000 [size=128]
	[virtual] Expansion ROM at f7000000 [disabled] [size=512K]
	Capabilities: <access denied>
	Kernel driver in use: nvidia

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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.

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