Ubuntu (kde/4k)

[Michael Butash]

Thanks for the feedback!

I went and updated plasma to 5.6.5 from kde-backports, and this is 
helping significantly from what I've managed to test.  I found that it 
did not actually pull in newer qt, I'm still at qt5 5.5.1, but so far 
the handling of the events is better.  When I start flipping all three 
of them on and off, it does start to mess up not putting the displays 
back to their proper offset they began as, but so far it hasn't glitched 
to make the res small, or crash kwin/plasma in ugly ways.  I'd suggest 
it so far after half a day.

I did look at getting the edid ghoster with the same thought, as I 
figured the glitching could be related to hdcp (damn drm), edid 
conversion from dp to hdmi, etc, but yeah, they were pricey.  A good one 
that can do full 4k/60hz was a few hundred bucks, and I need 3, so no.

I'm hoping to get the desktop to simply behave better in recovery, it 
would make my life much easier, and seems they are making some 
improvements at least.  They just abandoned plasma4 to be utterly broken 
for multi-monitor, hoping that's not the case here.

-mb


On 06/19/2016 02:07 PM, Brian Cluff wrote:
> On 06/18/2016 09:22 PM, Michael Butash wrote:
>> Since I don't know anyone else doing a 4k too - are you using a native
>> hdmi 2.0 gpu port?
>
> Yes, I'm running a Nvidia 980ti on mine.
>
>> 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
>
> I've had a decent amount of weird behavior as well, all of which seems 
> to come from substandard or too long of cables.  Once I used a high 
> quality cable that was much shorter my setup has been rock stable.
>
>> ...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.
>
> From what I have found it's all down to the loss of edid when the TV 
> goes off where computer monitors will continue to report that they are 
> connected even while off.
> I've recently purchased a higher end HDMI splitter that will 
> supposedly cache edid information.  I've yet to hook it up to find out 
> of it will work in reality.  If it does, it will completely fix the 
> problem.
>
> Brian Cluff