Thanks Brian. I've read much the same, but did see some late reports that others said they were having some issues with 5.6.5 still too. Not been brave enough to test the kde backports, last time was not so good an experience, but I do miss things like unused window transparency.

I might give this a go tonight and see, hopefully it doesn't destroy anything beyond the qt/kde realm to fall back to cinnamon.

Since I don't know anyone else doing a 4k too - are you using a native hdmi 2.0 gpu port?

I'm using an old AMD/ATI 7950 with displayport outs I'm connecting to 3x club3d dp1.2-to-hdmi2.0 adapters to my tv's that work mostly ok, but one always seems to freak out (weird seeing your middle display zoomed in at 640x480) and stop reporting the edid's properly after powering them all off and on at night. Not sure if this is the gpu card port or the adapter really, so starting to suspect those as maybe wonky, but curious if native hdmi is any more capable for power management or on/off behavior. Wondering your mileage here what works for you.

-mb

On 06/18/2016 05:10 PM, Brian Cluff wrote:

On 06/18/2016 02:00 PM, Michael Butash wrote:

I did however have to stop using KDE recently as moving from 6x 1080p monitors to 3x 4k tv's presents a situation that seems to aggravate the driver, hardware, as well as the desktop apps down to Qt itself. Being TV's, they're not smart about things like DPMS, and turning them off at night is like unplugging them to the pc. This causes all sorts of weird behavior I'm finding, plasma4.x u14.04+fglrx)couldn't remember which monitor was which to put things back properly when returning, and plasma 5.x (u16.04+ati/mesa) regressed with QT so still cannot deal with displays coming and going well to not simply freak out at times. Again, damn compositors.

I'm also running a 4K TV as a monitor and I had been letting it turn itself off after a certain amount of time not being used. In the morning I was greeted with a black screen that required pressing CTRL + ALT + F1, logging in, and doing various things to get my session back.
I did just go check the interweb and found the bug reports from other people having the same problem, and it appears that as of plasma 5.6 the problems should be solved. I've not tested it yet myself as my computer is busy, but it appears as long as you are running the latest Kubuntu WITH the backports PPA, you should be able to run KDE again without problems.

Brian Cluff