UEFI GOP Booting Problem - MSI Radeon HD 7850 Twin Frozr

I have two 7850s in Crossfire.  I flashed both my cards' VBIOS using atiflash and the VBIOS I obtained here, and it worked, but after I disabled CSM, I got a blank black screen.  Power cycling my PSU fixed the problem.  I can reboot just fine, and my cards work in games and whatnot, so I don't think my VBIOS is corrupt, but if I turn off my machine and leave it off for a while, I need to power cycle my PSU before turning it back on, or I get the blank black screen again.  This is with CSM disabled.  If I re-enable CSM, I have no issues whatsoever.
Could this be an issue because I have two card in crossfire?  Or is there a new version my VBIOS available?
Any help is appreciated.
Edited to add: This is the thread where I asked for a UEFI GOP VBIOS, for reference:
https://forum-en.msi.com/index.php?topic=168533.msg1232982#msg1232982

UEFI GOP booting (with CSM disabled) works with only one video card installed.  Either card works alone, but when I install both, I need to enable CSM to be able to boot reliably.
This must be a limitation of my motherboard.  Both video cards work fine otherwise, even in Crossfire.

Similar Messages

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