Confirming Bug using nvidia-prime on Kubuntu 14.10 & Ubuntu 14.10 using driver Nvidia-331.89, GT540M (Optimus) and ELAN trackpad on Acer 5755G. The freezing occurs when running on battery power in about every 2 to 5 minutes of usage in my case, Switching to and from VT only solution. On AC power the freezing generally occurs only once or twice in 24 hours.
Confirming Bug using nvidia-prime on Kubuntu 14.10 & Ubuntu 14.10 using driver Nvidia-331.89, GT540M (Optimus) and ELAN trackpad on Acer 5755G. The freezing occurs when running on battery power in about every 2 to 5 minutes of usage in my case, Switching to and from VT only solution. On AC power the freezing generally occurs only once or twice in 24 hours.