[Bug 85311] radeon 0000:01:00.0: Max Payload Size 16384, but upstream 0000:00:01.0 set to 128; if necessary, use "pci=pcie_bus_safe" and report a bug

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https://bugzilla.kernel.org/show_bug.cgi?id=85311

--- Comment #3 from Alex Deucher <alexdeucher@xxxxxxxxx> ---
When the radeon device is powered down, all the PCI registers and BARs read
back as ones. which is why you are seeing the radeon errors.  Apparently the
pci runtime pm code does not properly ask the driver to power the card up
before accessing those registers.  Unfortunately, I'm not that familiar with
the Linux runtime pm code.  I have no idea about the i915 and apci messages.

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