AMDGPU: RX 6500 XT: System reset when loading module

[Cal Peake]

[ 2nd try after subbing to the ml :) ]

Hi,

I'm trying to get my shiny new Sapphire 6500 XT (PCI 1002:743f rev c1, 
subsys 1da2:e457) up and running, but upon loading the amdgpu driver, the 
system does a hard reset.

If I pass test=1, it will delay the reset -- that is, the framebuffer code 
will kick in and the resolution of the console will change, but after the 
testing is done, it resets.

I've tested kernels 5.15.19, 5.16.9, and 5.17.0-rc3+, all with the latest 
firmware, all with the same result. Trying this on Slackware64 15.0, but 
it's the same story on Fedora Rawhide, openSUSE Tumbleweed, Ubuntu 22.04, 
and EndeavourOS.

Attached is the gzipped kernel output with test=1 passed and DRM debugging 
maxed out.

I've tried a bunch of module options and flipped a bunch of BIOS options 
as well, all to no avail. So, any help is appreciated. Thanks!

-- 
Cal Peake
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