Thanks for the guide BTW, it was much appreciated. A custom resolution would be better, but this seems an acceptable workaround. The fonts are a bit small now, but you can increase them in quite a few places to compensate. "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata "Sera" "GUI/ScaleFactor" 0.875
"C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata "Sera" "VBoxInternal2/EfiGopMode" 5 So instead I used the 1920x1200 setting scaled down: Also the fonts end up a bit large and there isn't enough pixel resolution. "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata "Sera" "GUI/ScaleFactor" 1.15Īnd while it works, it's not all that sharp. "C:\Program Files\Oracle\VirtualBox\VBoxManage.exe" setextradata "Sera" "VBoxInternal2/EfiGopMode" 4 I tried scaling up the 1440x900 setting like this: Given that it simply isn't possible to get a custom screen resolution to work with booting El Capitan or Sierra via EFI in VB, I had to decide what to do with my 1680x1050 screen (1.6:1 aspect ratio). I think that this is a Mac-specific problem as Win and Linux guests have guest additions. I'm inclined to report this as a VB bug, but first I need to replicate this on a Mac host rather than a Win host, or they'll ignore me. It's as if running the machine in a recent version of VB somehow does something to the install of Mac OS X in the virtual machine that can't be undone. But the fact that a downgrade of VB doesn't fix my problems suggests that it's more complex. The question is - is this a Mac OS X os issue or a VB one? The fact that you reported VMWare as having the same problems suggests a Mac OS X one. Moreover, if I downgrade to VB 4.3 and open that ML machine, the custom resolution doesn't work anymore - ML now has the same screen resolution problems.
What is particularly frustrating is that I was running Mountain Lion in VB 4.3.30 and the custom resolution trick used to work. I've done a lot of searching and tried as many things as I could think of without success. EfiGopMode works but not a custom resolution.
I've just used this guide to successfully install Sierra in VB 5.1.6 and have exactly the same problem. For me VBoxManage setextradata "OS X VM" "VBoxInternal2/EfiGopMode" N works fine, but custom resolution (for widescreen) is not working, However, it seems there is a problem with ElCapitan, because VmWare has similar problems.
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