high sierra killed [email protected] (active adapter HDMI 2.0)

Updated on 24-10-2017 in Adapters and Cables
11 on 30-09-2017

i use an LG TV with 2160×3840, connected to a mac pro (late 2013) via a club 3d mini displayport 1.2 to HDMI 2.0 active adapter.

worked like a charm in sierra, 50Hz or 60Hz for 2160×3840.

after update to high sierra, max frequency is 30Hz. picture quality is slightly lower than before, eg color edges on small letters. system profiler says 2160×[email protected].

any ideas to get 60Hz back?

thank you!

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3 on 30-09-2017

ah, sorry, forgot: in sierra, i also used a small app called RDM (retina display menu), since apple  does not allow switching to 60Hz.

in high sierra, having RDM present or not does not change anything. 30Hz max.

on 03-10-2017

rolling back to sierra is no option for you ?

on 03-10-2017

no, i have a legacy partition already for using final cut pro studio, the rest of the system needs to be up to date. also, i am sure there must be a solution in high sierra, too, since there is no technical reason for the restriction.

on 04-10-2017

ok. I know many MAC users use an app like SwitchResX to make a custom resolution on MAC OS …

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6 on 04-10-2017

checked out switchresx already. did not do the trick. system does not accept the modified 60Hz resolution, even with system integrity protection off.

on 06-10-2017

will check with R&D if they knwo a work around of some sort, but as often with new MAC OS Updates it often takes until a next update until (most) issues are fixed …

on 06-10-2017

great, thanks!

on 09-10-2017

no problem just hope these High Sierra issues will be resolved soon …

on 23-10-2017

did your R+D find out anything?

thx

on 23-10-2017

never mind.

just zapped NVRAM. and this actually brought back [email protected]. great!

thank you for your support! sorry to keep you busy.

on 24-10-2017

no problem, good to hear it is working for you 🙂

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