I have installed Freya on Parallels 11 VM on a MacBook Pro with Retina display. The VM has Video memory set at 256M 3D graphics.
The installation goes well with screen resolution at 1920x1280! but when it goes to reboot at the end of the installation it hangs on mount: / busy
I have to reset the VM and then when I boot the display goes to 800x600 and the display setup in settings only shows 800x600 as available resolutions.
If I reboot and interrupt the boot and boot from the selection of choices, it switches to 1920 by 1280 again and I can select 1920x1280 or a number of choices in the display settings and it looks awesome (text is tiny but that can be dealt with).
When I reboot it goes back to the 800x600 resolution and throws an error window up with the message: Could not apply the stored configuration for monitors none of the selected modes were compatible with the possible modes: Trying modes for CRTC 378 CRTC 378: trying mode 800x600@75Hz with output at 1920x1200@0Hz (pass 0) CRTC 378:trying mode 800x600@75Hz with output at 1920x1200@0Hz (pass 0)