With CSM settings changed, the BIOS will show up on a different monitor. For example, with CSM set to "always" my BIOS screen is on the DVI port, whereas with CSM set to "never" my BIOS screen shows up on the display with HDMI.
I wish I knew how to change this.
EDIT: Last night I tried many different combinations of options (including DSDT edits, different BIOSes and BIOS settings, OSX 10.10.1 update, etc.) without any success. Essentially what I need is CSM enabled to boot into Windows 7, but then this breaks USB after sleep in OSX. My best solution is to keep CSM enabled and simply not sleep in OSX.
If anyone has a way to boot Windows 7 with this board with CSM off, I'd greatly appreciate an explanation on how to do that.
This is strange.
I have two monitors connected to the DVI ports of a GTX 670, with CSM set to never I don't get bios or the Clover boot screen, just boots from a blank screen to the desktop.
No output on the internal HD4000 gfx either.
There must be a bios settings that controls this, perhaps with CSM set to never it only outputs to HDMI?