I've emailed this to Rod Smith, the author of rEFInd, but haven't yet heard back. Hoping someone here has a fix, or at least suggestions for what I could try.
I recently got a 27" iMac (the "late 2015" version) which has a 5k native resolution (5120x2880).
I've been wanting to install Linux on this machine, so I obtained rEFInd 0.10.1 and installed it successfully on the Recovery partition.
But when I first booted OS X using rEFInd, it boots into a lower resolution (3840 x 2160).
I rebooted into Recovery mode, used mountesp, and edited refind.conf to manually set the native resolution ("resolution 5120 2880"). But once I reboot, I get an error saying it can't set that screen mode, and then it boots once again with the incorrect resolution.
When I'm in 3840x2160 mode, the screen is glitchy and the computer is unpleasant to use. I have (hopefully temporarily) uninstalled rEFInd by reselecting Macintosh HD as the boot drive.
It appears rEFInd is incorrectly detecting what the default screen resolution should be on this version of the 27" iMac. Has anyone succeeded at getting rEFInd working on this model?
I recently got a 27" iMac (the "late 2015" version) which has a 5k native resolution (5120x2880).
I've been wanting to install Linux on this machine, so I obtained rEFInd 0.10.1 and installed it successfully on the Recovery partition.
But when I first booted OS X using rEFInd, it boots into a lower resolution (3840 x 2160).
I rebooted into Recovery mode, used mountesp, and edited refind.conf to manually set the native resolution ("resolution 5120 2880"). But once I reboot, I get an error saying it can't set that screen mode, and then it boots once again with the incorrect resolution.
When I'm in 3840x2160 mode, the screen is glitchy and the computer is unpleasant to use. I have (hopefully temporarily) uninstalled rEFInd by reselecting Macintosh HD as the boot drive.
It appears rEFInd is incorrectly detecting what the default screen resolution should be on this version of the 27" iMac. Has anyone succeeded at getting rEFInd working on this model?