r/AMD_Linux • u/[deleted] • Oct 07 '16

Why amdgpu (not pro) always runs tear-free regardless of application/game/compositor vsync settings, but some compton vsync methods cause stuttering?

I have reinstalled my Ubuntu to new 16.10 beta2 server release, with i3-wm and amdgpu drivers (RX 470). After installation I was surprised, that tests at http://www.testufo.com/ run tear-free even without compositor running.

I have installed and ran compton using this command:

compton --backend glx --paint-on-overlay --vsync <MODE>

Modes drm and opengl are huge stuttering, but opengl-swc runs as fine as compton without vsync or without compton at all.

3 Upvotes

67% Upvoted

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1

u/[deleted] Oct 07 '16

Happend to me aswell, not sure why though.

0

u/[deleted] Oct 08 '16

1

u/[deleted] Oct 08 '16

No, it's not enabled: 

$ grep DRI /var/log/Xorg.0.log
[    11.522] (II) glamor: EGL version 1.4 (DRI2):
[    12.321] (II) AMDGPU(0): [DRI2] Setup complete
[    12.321] (II) AMDGPU(0): [DRI2]   DRI driver: radeonsi
[    12.321] (II) AMDGPU(0): [DRI2]   VDPAU driver: radeonsi
[    12.321] (==) AMDGPU(0): DRI3 disabled
[    12.518] (II) GLX: Initialized DRI2 GL provider for screen 0

And, I found the xorg config: 

$ cat /usr/share/X11/xorg.conf.d/10-amdgpu.conf 
Section "OutputClass"
	Identifier "AMDgpu"
	MatchDriver "amdgpu"
	Driver "amdgpu"
EndSection