I had the same problem with Ubuntu 20.04 LTSP client: black screen
during boot, keyboard and mouse don't work, ssh works and "ring 0
stalled" messages in the system log. I had to switch to Ubuntu 18.04
which works fine.
CPU: AMD A8-5500B APU with Radeon(tm) HD Graphics
lshw -C display
*-display
description: VGA compatible controller
product: Trinity [Radeon HD 7560D]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:35 memory:c0000000-cfffffff ioport:f000(size=256)
memory:feb00000-feb3ffff memory:c0000-dffff
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https://bugs.launchpad.net/bugs/1863390
Title:
GPU lockup ring 0 stalled for more than X msec
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