https://bugzilla.kernel.org/show_bug.cgi?id=86431
--- Comment #3 from brent s. brent.saner@gmail.com --- Dmesg output attached.
The panel isn't attached to the AMD card? The ACPI issues in the other bug seem related to AMD, and it affects the display, even in TTY, so I had thought otherwise.
Let me know if you need any other output