videocards: 2x sapphire r9 380x nitro dual-x oc w/bp (11250-01-xx)
motherboard: asus m5a97 le r 2.0 - bios 2701
cpu: fx 8350
pover supply: thermaltake neva 750w (w0427re)
display: acer g235h resolution 1920x1080 60hz connected d-sub -------------------- d-sub to dvi-i
ram: 16 gb
os: ubuntu 16.04 x64
i tried different versions of ubuntu 16.04 and older drivers.
in result have a black screen after grub MVI 9511 - YouTube
also i tried ubuntu 14.04 with proprientary drivers - it doesn't work
also i tried to connect one of videocards and change it
i attach system logs
at windows 7 x64 with different versions of catalyst all works fine
I solve this problem by adding nomodeset in grub options.