Bug 108570

Summary: AMDGPU DC not working on PCI Express 2.0?
Product: DRI Reporter: TestMode11
Component: DRM/AMDgpuAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED NOTABUG QA Contact:
Severity: normal    
Priority: medium    
Version: XOrg git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:
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Description Flags
dmesg-amd none

Description TestMode11 2018-10-26 16:15:24 UTC 
On RX560 I get the following in dmesg

[    8.426625] kfd kfd: skipped device 1002:67ef, PCI rejects atomics

Then in Weston start log I do not see "DRM supports atomic modesetting". 

Does this mean that DC is not active? Do AMDGPU DC and atomic modesetting only work with PCI Express 3.0?
Comment 1 John Bridgman 2018-10-26 16:22:34 UTC 
I don't believe there is any connection between "atomic" modesetting and atomic operations in PCIE 3.0.

Do you see other DC-related messages ? Might be helpful to post your full dmesg output.
Comment 2 TestMode11 2018-10-26 16:43:39 UTC 
Created attachment 142223 [details]
dmesg-amd
Comment 3 TestMode11 2018-10-26 16:44:45 UTC 
Not seeing any DC success or error messages - though not clear how these would look.
Comment 4 Alex Deucher 2018-10-26 17:06:17 UTC 
(In reply to TestMode11 from comment #0)
> On RX560 I get the following in dmesg
> 
> [    8.426625] kfd kfd: skipped device 1002:67ef, PCI rejects atomics

That message is from kfd.  It's for ROCm.  Unrelated to DC

> 
> Then in Weston start log I do not see "DRM supports atomic modesetting". 
> 
> Does this mean that DC is not active? Do AMDGPU DC and atomic modesetting
> only work with PCI Express 3.0?

No, DC has nothing to do with pci atomics.  DC is enabled:
[    8.690697] [drm] Display Core initialized with v3.2.02!

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