Can you tell me the output of following
$ lspci -nn | grep VGA
Probably our kernels do not have your gfx card's firmware.
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ubuntu-mate@ubuntu-mate:~$ lspci -nn | grep VGA
0000:01:00.0 VGA compatible controller : Advanced Micro Devices, Inc. [AMD/ATI] Curacao XT / Trinidad XT [Radeon R7 370 / R9 270X/370X] [1002:6810]
My card is the R9 270X - as far as I recall.