Bug 105423 - Unable to unbind my 2nd GPU (Rx580)
Summary: Unable to unbind my 2nd GPU (Rx580)
Status: RESOLVED INVALID
Alias: None
Product: DRI
Classification: Unclassified
Component: DRM/AMDgpu (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Default DRI bug account
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Reported: 2018-03-09 18:55 UTC by Maxime
Modified: 2018-03-12 21:47 UTC (History)
1 user (show)

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Description Maxime 2018-03-09 18:55:55 UTC 
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
Comment 1 Maxime 2018-03-09 21:31:12 UTC 
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.
Comment 2 Maxime 2018-03-09 23:53:26 UTC 
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
Comment 3 Andrey Grodzovsky 2018-03-12 21:47:00 UTC 
(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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