https://bugs.freedesktop.org/show_bug.cgi?id=103463
--- Comment #9 from Michel Dänzer michel@daenzer.net --- (In reply to Dennis Schridde from comment #0)
During a boot like this, the second card (AMD Radeon RX 560) fails to come up and is not available to the system.
That's actually because of:
[drm:gfx_v8_0_ring_test_ring [amdgpu]] *ERROR* amdgpu: ring 0 test failed (scratch(0xC040)=0xCAFEDEAD) [drm:amdgpu_device_init [amdgpu]] *ERROR* hw_init of IP block <gfx_v8_0> failed -22 amdgpu 0000:01:00.0: amdgpu_init failed
the other messages are probably mostly harmless / not directly related to this problem.
- Hangs of the entire system when I start Steam using `env DRI_PRIME=1
steam` (nothing reacts to commands anymore, including mouse clicks, the power button and the num-lock key, and the mouse cursor moves very sluggishly)
That's probably related to the above.
- The firmware and GRUB (and Linux, initially) display at 1024x768, while
the monitor's native resolution is 2560x1080.
That's a motherboard firmware / video card ROM issue, nothing to do with the Linux kernel / drivers.