Bug 105423

Summary:	Unable to unbind my 2nd GPU (Rx580)
Product:	DRI	Reporter:	Maxime <berillions>
Component:	DRM/AMDgpu	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED INVALID	QA Contact:
Severity:	normal
Priority:	medium	CC:	andrey.grodzovsky
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

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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