Issues with output through dual-link DVI adapter to ACD 30"
I recently was given a used Apple Cinema HD Display (with original PSU), however I am unable to obtain a full-resolution output (2560x1600) from my Function Keys MBP to the display. I am only able to achieve 1280x800 resolution after purchasing a recommended Club3D USB-C to Dual Link DVI adapter (CAC-1510) which has reviews stating it is fit for purpose and has documentation on its product page suggesting it would work. I am running on the latest version of macOS Catalina (10.15.4).
I believe the adapter does work as when connected to a Lenovo Thinkpad t480s over both of its USB-C ports, the display functions at full resolution (2560x1600) with no issues.
I've tried fixes posted elsewhere online in the following order:
- Holding the option key to display additional scaled resolutions once clicking the 'scaled' button;
- Resetting SMC / NVRAM / PRAM / anything else that can be reset from those guides;
- Disassembled and inspected the USB-C connectors, given a clean and reassemble my MacBook Pro;
- Installed a clean version of High Sierra to ensure it isn't a software problem (with the same result, now installed back to 10.15.4 using a time machine backup);
- Deleted a display .kext file from Library/Preferences/ and rebooted the machine to no avail;
- Used the options modifier key for the display scaling in safe mode and switched back to normal boot.
If anyone has any guidance on what else I could do, please let me know. I'm at a loss and would just like the monitor/adapter to function as advertised with my MacBook Pro ASWELL as my Thinkpad! I am unaware of any hardware restrictions but if this is the case then apologies for the long wall of text.
Thanks in advance!
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