Bug 103317

Created attachment 134889 [details]
Dmesg output

Please attach the output of

 xrandr --verbose

while the problem occurs (i.e. while e.g. 0ad is running and showing flickering).

Does not enabling TearFree or

 Option "EnablePageFlip" "off"

avoid the problem?

Created attachment 134912 [details]
Output of xrandr --verbose

As suggested I turned EnablePageFlip off:

Section "Device"
	Identifier "AMD R9 390"
	Driver "amdgpu"
	Option "DRI" "3"
	Option "EnablePageFlip" "off"
#	Option "TearFree" "true"
EndSection

But this doesn't avoid the problem. As before, everything works fine when I switch to FHD or radeonsi.

(In reply to Torsten Kessler from comment #3)
> As suggested I turned EnablePageFlip off:
[...]
> But this doesn't avoid the problem.

Please attach the corresponding Xorg log file.


> As before, everything works fine when I switch to FHD or radeonsi.

You cannot "switch to radeonsi", I assume you mean when you use the radeon kernel driver instead of amdgpu. The Mesa radeonsi driver is used in both cases.

You might want to try a kernel built from the amd-staging-drm-next branch of https://cgit.freedesktop.org/~agd5f/linux/ with CONFIG_DRM_AMD_DC=y at build time and amdgpu.dc=1 at runtime, to see if that works better.

Created attachment 134943 [details]
Second Xorg log with EnablePageFlip turned off

You're right. I was mixing things up. I meant loading the radeon module and blacklisting the amdgpu module solves the issue.
I'm just downloading the kernel from the amd-staging-drm-next branch. I will see tomorow if it helps. Thank you for your help so far!

The new display engine (amdgpu.dc=1) definitely helps. It nearly eliminates the flickering during videos or browsing. It has no effect on 3D applications, for example 0ad.
There seems to be a bug in the amd-staging-drm-next branch. Rotating the screen with xrandr results in a blackscreen. But this will be a different bug report.
That's why I using the kernel from the amd-staging-4.13 branch with amdgpu.dc=1.

(In reply to Torsten Kessler from comment #6)
> The new display engine (amdgpu.dc=1) definitely helps. It nearly eliminates
> the flickering during videos or browsing. It has no effect on 3D
> applications, for example 0ad.

Adding DC developers to Cc. I'm afraid at this point it's unlikely that this issue will be fixed in the non-DC code.

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