https://bugs.freedesktop.org/show_bug.cgi?id=96527
--- Comment #3 from Alex Deucher <[email protected]> ---
It looks like a GPU hang. I think the displayport failure is just a side
effect of that. Does it work if you disable acceleration in X? To disable
acceleration, add an /etc/X11/xorg.conf file with the following content:
Section "Device"
Identifier "Device0"
Driver "radeon"
Option "NoAccel" "true"
EndSection
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