General Questions (Last Updated 05/05/2020)
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5. Target Display Mode is available on the K1100M, K2100M, WX4170, and WX7100 when using both custom VBIOS and OpenCore. Target Display Mode is *only* stable under High Sierra and should not be used in later OS's.
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Hello guys, first of all huge thanks to the devs for this amaizing mod !!! 😃😃😃😃😃😃
My question is
Target Display Mode (TDM) related.
I am very interrested in that feature since it is neat to have that huge screen + sound and a backup mac.
I use TDM with my main windows computer and switch to macOS when my PC doing heavy load (3D renders etc...)
I do have TDM issues, sometimes I am unable to revert back to macOS after TDM was engaged. Currently running High Sierra with all the lates patches and OpenCore. Sometimes it does so and sometimes it dont... before I was running EL Capitan for 1 month and TDM worked 50/50, it was glitching while reverting back to iMac with black screen and need to drag a window in order to refresh screen to get a picture, but it was reverting back to iMac all the time without any fault.
Also engaging TDM is instant but disengaging it sometimes takes 10 minutes after the keypress. Since I was annoyed by that huge wait time I updated to High Sierra (13.6) in order to get a
"stable" target display mode expecting it working correctly and faster. As marked in the first post quoted above. But I think it get worse after High Sierra update actually !!!
Usually it decides to obey and revert back to iMac from windows TDM, in HS I don't get any black screen glitches like it was with El Capitan (which is nice) but sometimes it may glitch even "harder" and the screen will remain stuck black while iMac still operating; I can hear sound while I press certain keys meaning OS is till running ok and not freezed. And there is no way to reboot it "gently" (needing to unplug the iMac in order to do a complete reboot or press the power button for longtime).
The wait time to disengage TDM is huge (10-15 min).
Is there a way to make it shorter and this is the main issue?
Is that normal ?
Shure, I always can manually unplug the cable and it will revert intstanly to MacOS but it is not a long term solution and this method dont work if iMac bugged with black screen as described above. Anybody with similar issues ?
Am I doing something wrong here or missing some kexts in Open Core???
Is that possible that my gpu is too slow ? (K1100M)
[Unrelated question] Is there a way to control brightness while in TDM? When engaging TDM backlight goes full blast even if it was dimmed in MacOS prior to that. Any solution would be welcome.
My specs:
- 2010 iMac i5 27" with Quadro K1100M 2G (flashed first with Nicks VBIOS via Windows )
+ running on Open Core with default config.plist (unzipped from Nvidia archive)
Other than that everything works fine, Sleep works well, no other glitches, no kernel panics. Perfect. Gets kinda hot but in acceptable range.
Thanks to the developers/modders for their dedication to this project.
Thanks for your time.