[Bug 107045] [4.18rc2] RX470 dGPU on hybrid laptop freezes screen after use

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107045

--- Comment #17 from Andrey Grodzovsky <andrey.grodzovsky at amd.com> ---
(In reply to taijian from comment #15)
> Created attachment 140733 [details]
> dmesg output 4.18rc5 + drm-fixes-2018-07-20
> 
> OK, so I have some new, probably interesting dmesg output with the latest
> mainline build.
> 
> What's happening here is that the system boots up, then my background
> display brightness service goes to work (see here:
> https://github.com/FedeDP/Clight and here:
> https://github.com/FedeDP/Clightd) and tries to adjust screen brightness.
> This leads to a number of 
> 
>   RIP: 0010:dm_dp_aux_transfer+0xa5/0xb0 [amdgpu]
> 
> trace calls and then the system freeezes completely. And I mean completely,
> as in not even sysrq + REISUB does anything. Does this help in any way?

So i tried with kernel 4.18 rc.1 from here -
https://cgit.freedesktop.org/~agd5f/linux/log/?h=amd-staging-drm-next

and 2 cards 

Provider 0: id: 0x81 cap: 0x9, Source Output, Sink Offload crtcs: 5 outputs: 3
associated providers: 1 name:AMD Radeon (TM) RX 460 Graphics @ pci:0000:0b:00.0
Provider 1: id: 0x49 cap: 0x6, Sink Output, Source Offload crtcs: 6 outputs: 4
associated providers: 1 name:AMD Radeon (TM) RX 480 Graphics @ pci:0000:08:00.0

Where RX 460 is the default and RX 480 is the secondary. I ran both glxgears
and glxinfo multiple time with DRI_PRIME=1 and haven't observed any issues.

>From the log I see GPU pci config reset print - where does it come from ? Did
you trigger PCI reset for the device  manually or did it happen once you tried
to run any application with DRI_PRIME=1 ? Which device is 0000:01:00.0 -
primary or secondary ?

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