Still no luck with the latest nvidia driver 346.47!
As soon as I use the driver nouveau, there is no problem, no high memory usage of kwin/xorg processes or graphics memory.
Furthermore I have tested a fresh installation with Kubuntu 14.04.2 Install-DVD with a complete wipe-out of all partitions of the SSD , but the problem occurs there too.
Still no luck with the latest nvidia driver 346.47!
As soon as I use the driver nouveau, there is no problem, no high memory usage of kwin/xorg processes or graphics memory.
Furthermore I have tested a fresh installation with Kubuntu 14.04.2 Install-DVD with a complete wipe-out of all partitions of the SSD , but the problem occurs there too.