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I'm stuck at this step... can you please give me a hint on where to get this .aml files and/or how to create them? Tried using Corpnewt's SSDTTime script but can't figure how to use it. None of the options presented when script is run seems relevant: Also, is not clear to me if I should...

Would you recommend upgrading first to Big Sur, or go directly for Monterey?

Thank you, looks very similar to my system. Will give it a try.

Thanks a lot. Anything I should be aware of, also, based on this ( I think Clover might need an update )?

Thanks @P1LGRIM ! So the graphics will be the bottleneck? Should I expect all USB ports to work ( 3.0 ports also )?

Hey, Happy and healthy new year everyone! Any idea if I have any chances to have a working Monterey on my hardware? MB: Asus Z87-A CPU: i7-4770 GPU: GTX 650 Ti Thanks!

Not sure if it has any meaning, but I don't have to restart the OS, just a user logout and is all fixed.

It's crystal clear now where the problem is! Thanks a lot, you've been very helpful! Quick question: does it seem logic to you that a simple logout from the os while the artefacts are manifesting is fixing the issue? Because it so looks like a driver reload... And the logout does fix the issue...

Alright then, this at least gave me a hint on where the issue is. On both my problems, with the display and with the audio. The bottleneck seems to be the graphic card so that will be the next on my shopping list. The monitor does have a display port but the nvidia card doesn't. I just tried...

Hey @Edhawk , so sorry for the late reply, been very busy lately with other stuff. Here are my answers to your questions ( as my issue still stands ): Q: "You have tried a different HDMI cable when connecting the Lenovo display? Do you see the same flickering issues?" A: No, I'm 100% sure is...

ok... sorry to keep pushing... could you please be a little more specific about it? thanks!

OK, now I'm sure I have an unaltered applehda kext ( I got one from the installation usb drive ). Still no hdmi audio. Anything else I can try? Any hints from the diagnostic files I've uploaded earlier? Thanks!

Same result @chumdoggin, unless as you say, my applehda is altered. How can I check that?

Any idea if with my Nvidia GTX 650 Ti I'd have any chances to use the hdmi audio? I have a dual monitor system with main ( the one with the speakers ) using hdmi port and secondary using the dvi port of my graphic card. Thank you. LE: I've attached the diagnostic files as well ( tried AppleHDA...

Anyone got these symptoms yet?

No HPET in my bios. Since the issue manifested itself also back when I was using just the dvi with Benq display, does it make any difference if I connect the 2nd display on dvi instead of hdmi?

No, running on standard speed.

@kylec the video card has 1 x d-sub, 2 x dvi and 1 x hdmi. You think of something along these ports? In fact, the flickering happened also back in the days when I only used one display ( the Benq one ). It just continued after connecting the second one also. The frequency is from... once in a...

Hi, please have a look at this video: Can you please give me a hint on where to look for troubleshooting? My hardware config is: MB: Asus Z87-A CPU: i7 Haswell Video: NVidia GTX 650Ti Displays: Lenovo Q27Q-10 on HDMI ( primary ) + Benq BenQG2222HDL on DVI Thank you!

@feisalm Writing from a High Sierra newly installed! So, thank you! You made my day!