MOJAVE No more HDMi Video and HDMI audio on AMD R9 280X

[niaknyai]

I have just updated my system to Mojave.
As expected no more HDMi audio.
Usually I fixed that after installation on High Sierra.
But with Mojave I get a different result :
ALC 1150 output audio is ok.
Only the Mini displayports are working.
The computer sees that I connected a TV over HDMI (both in Audio and Monitors) but nothing plays on them.
If I copy Desktop on TV, the pictures get shaky.
If I use the TV as a different Desktop my LCD Monitor is fluid.

After installation I used last versions of Lilu and Whatevergreen.
If someone know a way to get my HDMI output working, let me know.

Thanks

 

[collingtech]

im in the same boat mate, studying some solution

 

[niaknyai]

im in the same boat mate, studying some solution

I didn't find the solution but I tried to reboot using my High Sierra usbkey (F12 on startup) made with UniBeast, then at prompt, choosing the Mojave HD : It solved the problem (HDMi A/V output) BUT I need to start from the High Sierra USB. Maybe it will work for you too.