[Bug 108521] RX 580 as eGPU amdgpu: gpu post error!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108521

--- Comment #29 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Robert Strube from comment #28)
> Quick update:
> 
> I heard back from the ACPI BIOS kernel developers (see:
> https://bugzilla.kernel.org/show_bug.cgi?id=201527) and they seem to imply
> that the PCI resource issues showing up in the dmseg log are *not* a
> problem.  Linux is simply trying to allocate more resources, and that the
> failure is OK and it does get the requisite resources required.

It would appear to not be ok as when it gets the resources, the GPU works.

Does disabling dpm make the GPU work?  E.g., append amdgpu.dpm=0 to the kernel
command line in grub.  The driver needs to query the supported pcie speeds from
the pcie bridge it is connected to in order to setup the power management
controller.  Maybe when the resources are not available, the driver is not able
to get that information or it gets garbage.

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