[Bug 108625] AMDGPU - Can't even get Xorg to start - Kernel driver hangs with ring buffer timeout on ARM64

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108625

--- Comment #10 from Carsten Haitzler <raster at rasterman.com> ---
so wouldn't that make it a necessity then if its even glamor needing it? i
guess i can turn off glamor accel but realistically gl is a necessity so the
problem needs to be addressed sooner or later.

the ring gfx timeout smells to me of "not a mesa bug" in that an ioctl going to
the drm driver never returns qhen doing a simple query. it hangs, thus
something lower down that is having a bad day, if something as simple as
querying a fence causes a hang... :)

what is this ring gfx thing exactly (seems to be some command queue) and why
would it be timing out? all the way back at seq 10/11 ... like right at the
start of its use? it's almost like some interrupt or in memory semaphore thing
mapped from the card is messing up? i'm looking for something to look into more
specifically.

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