Hello all,
Just got the CAC-1510-A to connect a M1 iMac with the 30” cinema display. Unfortunately I haven’t been able to get the proper 2560×1600 resolution, even while holding down the option key prior to choosing a resolution.
What am I missing here? I’ve heard of people that have had success with this adapter and a M1 Mac mini, so perhaps it’s related to the iMac specifically?
Any help would be much appreciated!
You are getting 1280×800? Is it 1280×800 HiDPI (smooth text) or 1280×800 scaled up to 2560×1600 (blocky, pixelated)?
See if the 2560×1600 option exists in SwitchResX?
M1 Macs don’t give any useful diagnostic info so I can’t say what’s going on. On an Intel Mac, I would use the AGDCDiagnose command to get some info.
M1 Macs don’t use display overrides so we can’t do workarounds for some problems.
The CAC-1510 requires four lanes of HBR to support 2560×1600 mode. The M1 Mac should be capable of that.
Maybe try connecting the adapter to a Thunderbolt 3 dock. The HP Thunderbolt Dock G2 has a USB-C port that is part of a MST Hub which might be useful because it can convert two lanes HBR2 or HBR3 to four lanes of HBR (in case some lanes aren’t working).
I you want to try adding a custom resolution, the timings for the supported modes are:
[email protected] 49.306kHz 71.00MHz h(48 32 80 +) v(3 6 14 -) [email protected] 98.529kHz 268.00MHz h(48 32 80 +) v(3 6 37 -)
What does the script at https://gist.github.com/joevt/e862b0088ef58b9144877d01401bcee8 show?
Did you try clicking on Selected resolutions while holding the ALT key pressed? That worked for me…
Yes, that’s the way to do it
