I'm running Mint 19 x64 Cinnamon on a Kaveri A8-7600 APU. The default "radeon" driver works fine, but I want to enable the "amdgpu" driver to take advantage of the performance gains discussed here: Four Years After Launch, AMD Kaveri Sees Huge Performance Boost On Linux.
However, whenever I add "radeon.cik_support=0 amdgpu.cik_support=1" in GRUB, Mint boots to a black screen. I do hear the chimes when it logs in, but don't see anything. I tried following the instructions in this thread: How to get Vulkan support on older AMD GCN cards on Mint 19 but nothing changed, except that "amdgpu" finally showed up as an unloaded driver when in "radeon" mode. On a fresh Mint install, "amdgpu" didn't even show up as an unloaded driver.
Here are various outputs while running under "radeon" that might be relevant. Ctrl+Alt+F1 doesn't even work while running under "amdgpu".
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inxi -Gx Graphics: Card: Advanced Micro Devices [AMD/ATI] Kaveri [Radeon R7 Graphics] bus-ID: 00:01.0 Display Server: x11 (X.Org 1.19.6 ) drivers: ati,radeon (unloaded: modesetting,fbdev,vesa,amdgpu) Resolution: email@example.com OpenGL: renderer: AMD KAVERI (DRM 2.50.0, 4.15.0-29-generic, LLVM 6.0.1) version: 4.5 Mesa 18.2.0-devel Direct Render: Yes
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sudo lshw -c video *-display description: VGA compatible controller product: Kaveri [Radeon R7 Graphics] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 1 bus info: pci@0000:00:01.0 version: 00 width: 64 bits clock: 33MHz capabilities: pm pciexpress msi vga_controller bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:43 memory:c0000000-cfffffff memory:d0000000-d07fffff ioport:f000(size=256) memory:ff700000-ff73ffff memory:c0000-dffff