[Bug 105423] Unable to unbind my 2nd GPU (Rx580)

[Bug 105423] Unable to unbind my 2nd GPU (Rx580)

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https://bugs.freedesktop.org/show_bug.cgi?id=105423

            Bug ID: 105423
           Summary: Unable to unbind my 2nd GPU (Rx580)
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: berillions@gmail.com

Hi,

I have a problem when i want to unbind my 2nd GPU to bind it to VFIO.

I create a xorg.conf like that :
https://pastebin.com/3FfYJq1B

But even if X is closed (by /etc/init.d/xdm stop), i have a crash log in dmesg
:
https://pastebin.com/uAbjvJY3

thanks for your help,
Maxime

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[Bug 105423] Unable to unbind my 2nd GPU (Rx580)

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https://bugs.freedesktop.org/show_bug.cgi?id=105423

--- Comment #1 from Max <berillions@gmail.com> ---
Ok, i found an interesting thing. I have this issue when i unbind my GPU on
Kernel 4.15 but i have no issue when i do it on kernel 4.14.

I'll try to git bisect between kernel 4.15 and kernel 4.14.

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[Bug 105423] Unable to unbind my 2nd GPU (Rx580)

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https://bugs.freedesktop.org/show_bug.cgi?id=105423

--- Comment #2 from Max <berillions@gmail.com> ---
Thanks to Nick Sarnie on Discord, he found that disable completely DC fix the
issue.

I fix it with "amdgpu.dc=0" in my grub.conf

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[Bug 105423] Unable to unbind my 2nd GPU (Rx580)

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https://bugs.freedesktop.org/show_bug.cgi?id=105423

Max <berillions@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

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[Bug 105423] Unable to unbind my 2nd GPU (Rx580)

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https://bugs.freedesktop.org/show_bug.cgi?id=105423

--- Comment #3 from Andrey Grodzovsky <andrey.grodzovsky@amd.com> ---
(In reply to Max from comment #2)
> Thanks to Nick Sarnie on Discord, he found that disable completely DC fix
> the issue.
> 
> I fix it with "amdgpu.dc=0" in my grub.conf

Did you try latest  kernel (4.16.rc4 i think) seems to me this issue is already
fixed there in DC.

Andrey

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