I recently updated my Kubuntu Wily Verix 547 (nVidia Optimus) laptop from KDE 5.4.3 to 5.5.3 via backports and it's performing well so far! The system feels very smooth now, the notification area is consistent and predictable, suspend/resume feels like it's a solved problem, and the system as a whole feels more stable. Note that the Kubuntu packagers also upped Qt to 5.5.1, which is probably also a piece of the ever-improving KDE puzzle.
Thanks for all the hard work!
There are a few problems, still, mainly related to Optimus. My system won't currently start X using the discrete (970M) video card. X says it can't find an output and fails. With prime-select in 'intel mode, the system boots to a "running in low graphics mode" dialog but will load successfully when selecting the normal graphical boot. The Verix is an Intel 4810QM which has a perfectly serviceable IGPU for non-gaming work, so this is acceptable for now. But, I'll be fighting with nVidia soon enough, I'm sure.
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