mate 18.04 32-bit and 20.04 64-bit.
32-bit loads to black screen after mate startup logo, 64-bit (20.04) is using radeon LLVM without problems.
GPU is AMD RX 550.
Tried in grub "quiet splash nomodeset"
Tried in grub "quiet splash modeset"
Tried in grub "quiet splash amdgpu.dc=0"
IN 32-bit(18.04), all i can get to is black screen with cursor. I have oibaf ppa loaded and updated. I have taken out nomodeset, modeset, and amdgpu.dc=0 from grub and ran with just quiet splash. I always get this error.
20.04 64-bit I have changed nothing, compared both from grub and grub 2 under normal settings. If both have just "quiet splash" only 18.04 32-bit comes up with black screen. The display cycles (blinks 3 times (cycles) blinks 3 times, over and over. Other posts I have found have said running with no "quiet splash" or adding "quiet splash radeon.dpm=0" might work?
#lspci -k | grep amdgpu shows:
kernel modules:amdgpu
-so i apt update and apt upgrade, make sure ppa:oibaf is listed....
#lspci -k | grep amdgpu shows:
08:0:00 controller: Advanced Micro Development leka Pro (RD 550/550x) (RevC7)
subsystem:Gigabyte Tech Ltd. Lexa Pro (Radeon RX550)
kernel modules:amdgpu
Check grub, leave as "quiet splash", update-grub reboot....Still will not work....
Edit grub to "quiet splash nomodeset" update-grub, reboot
"quiet splash modeset" update-grub, reboot
"quiet splash amdgpu.dc=0" reboot
no changes......nothing changes
#lshw -c video shows :
*-video UNCLAIMED
description: VGA compatible controller
product: Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:08:00.0
version: c7
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=amdgpu latency=0
resources: irq:35 memory:e0000000-efffffff memory:f0000000-f01fffff ioport:1000(size=256) memory:f0f00000-f0f3ffff memory:c0000-dffff
It SEES the card but will not work with it...