Screen flicckering due to "drm/amdgpu: enable gfxoff again on raven series"

[Pinky]

cat /sys/kernel/debug/dri/0/amdgpu_firmware_info
VCE feature version: 0, firmware version: 0x00000000
UVD feature version: 0, firmware version: 0x00000000
MC feature version: 0, firmware version: 0x00000000
ME feature version: 40, firmware version: 0x00000099
PFP feature version: 40, firmware version: 0x000000ae
CE feature version: 40, firmware version: 0x0000004d
RLC feature version: 1, firmware version: 0x0000d237
RLC SRLC feature version: 1, firmware version: 0x00000001
RLC SRLG feature version: 1, firmware version: 0x00000001
RLC SRLS feature version: 1, firmware version: 0x00000001
MEC feature version: 40, firmware version: 0x0000018b
MEC2 feature version: 40, firmware version: 0x0000018b
SOS feature version: 0, firmware version: 0x00000000
ASD feature version: 0, firmware version: 0x0017ba78
TA XGMI feature version: 0, firmware version: 0x00000000
TA RAS feature version: 0, firmware version: 0x00000000
SMC feature version: 0, firmware version: 0x00001e44
SDMA0 feature version: 41, firmware version: 0x000000a9
VCN feature version: 0, firmware version: 0x01004912
DMCU feature version: 0, firmware version: 0x00000001
VBIOS version: 113-RAVEN-110



* Deucher, Alexander <Alexander.Deucher at amd.com> [2019-04-05 18:33:23 +0000]:

>+ Ray
>
>Ray, any ideas?
>
>Pinkava,
>
>can you provide the output of:
>sudo cat /sys/kernel/debug/dri/0/amdgpu_firmware_info
>
>Thanks,
>
>Alex
>________________________________
>From: Pinky <j-pi at seznam.cz>
>Sent: Friday, April 5, 2019 1:53 PM
>To: Deucher, Alexander
>Cc: amd-gfx at lists.freedesktop.org
>Subject: Re: Screen flicckering due to "drm/amdgpu: enable gfxoff again on raven series"
>
>No, this does no do anything, the bug is still present.
>
>
>* Deucher, Alexander <Alexander.Deucher at amd.com> [2019-04-05 17:07:21 +0000]:
>
>>This may be related to stutter mode rather than gfxoff.  If so, there is a fix in the pipeline for that.  Does setting appending amdgpu.ppfeaturemask=0xfffdbfff on the kernel command line fix it?
>>
>>Alex
>>________________________________
>>From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Pinky <j-pi at seznam.cz>
>>Sent: Friday, April 5, 2019 12:24 PM
>>To: amd-gfx at lists.freedesktop.org
>>Subject: Screen flicckering due to "drm/amdgpu: enable gfxoff again on raven series"
>>
>>Hello,
>>
>>I have today compiled the drm-next kernel from (1) and find out the screen is
>>flickering and shows various artifacts. By bissecting I found the cause
>>is commit 005440066f929ba0dca8f4e0aebfbf8daac592cc. By reverting it the
>>problem went out.
>>
>>I does not have idea about what to do next. Sorry if this should be posted to
>>some bugzilla instead, I have got a bit lost. If so, would You please
>>point my out what to do?
>>
>>With best regards,
>>    Pinkava J.
>>
>>
>>lspci (partial)
>>
>>00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Raven/Raven2 IOMMU
>>00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe Dummy Host Bridge
>>06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series] (rev d1)
>>06:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio Controller
>>
>>
>>
>>
>>(1) git://people.freedesktop.org/~agd5f/linux
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>
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>