Before continuing this guide please install Oibaf PPA for the latest open source drivers. You may or may not need it, but just in case I would suggest you install it. Mint 19 comes with fairly new open source drivers but I'd install this anyway.
https://www.phoronix.com/forums/forum/l ... cs-drivers
Also, be aware at the time of writing this guide, Oibaf PPA needs this to get it to work.
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sudo apt-get install libwayland-egl1
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sudo gedit /etc/default/grub
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GRUB_CMDLINE_LINUX=""
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GRUB_CMDLINE_LINUX=" radeon.si_support=0 radeon.cik_support=0 amdgpu.si_support=1 amdgpu.cik_support=1"
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sudo update-grub
Step#2 Create a 20-radeon.conf file.
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sudo gedit /usr/share/X11/xorg.conf.d/20-radeon.conf
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Section "Device"
Identifier "AMD"
Driver "AMDGPU"
Option "DRI3" "on" #enable DRI3 instead of the default DRI2-mode
EndSection
Step #3 Install Vulkan
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sudo apt-get install mesa-vulkan-drivers mesa-vulkan-drivers:i386
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sudo lshw -c video
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*-display
description: VGA compatible controller
product: Pitcairn PRO [Radeon HD 7850 / R7 265 / R9 270 1024SP]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=amdgpu latency=0
resources: irq:31 memory:c0000000-cfffffff memory:fea00000-fea3ffff ioport:e000(size=256) memory:c0000-dffff