[Bug 98552] RX 480 does not work as eGPU (amdgpu crashes at amdgpu_bo_init)

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Nov 2 19:23:16 UTC 2016


Alex Deucher <alexdeucher at gmail.com> changed:

           What    |Removed                     |Added
         Resolution|FIXED                       |NOTOURBUG

--- Comment #9 from Alex Deucher <alexdeucher at gmail.com> ---
(In reply to Gašper Sedej from comment #8)
> I am using "EXP GDC Beast",
> http://www.banggood.com/EXP-GDC-Laptop-External-PCI-E-Graphics-Card-p-934367.
> html
> The limitation is on PCIe lanes - only 1x or 2x. The pcie version is
> probably v2 because of laptop age.
> The EXP GDC hase some CTD and PTD settings as seen in link, but I am not
> sure what it does. (nvidia works in current settings)
> The laptop can boot via BIOS and via EFI. I did EFI installation, since I
> read it was better for such setups.
> I am using kernel parameters pci=norcs and pci=realloc - I don't know why,
> but nvidia does not work without those parameters.
> I think "pci=realloc" is for kernel memory allocation, but this is different
> than "PCI BAR" right?
> Where can I ask about PCI BAR issue?

pci=realloc will attempt to handle additional pci resources like bars that were
not handled by the bios on boot.  Whether or not it succeeds will depend on the
number and size of the bars.  Do you also need pci=norcs?  You may just be
getting lucky on the nvidia card if it uses fewer or smaller bars.  Please
attach the full dmesg output.  You should see messages about unassigned

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