Half vsync on intel

[amelia808]

Currently experiencing the same issues as #39 and #36 although on intel graphics with archlinux.

[tildearrow]

Umm.... maybe they fixed VSync behavior in a newer version of Mesa...?

1. Can you report your glxinfo | grep OpenGL?
2. Try setting the "VSync mechanism" option to "None and just hope for the best" and tell me if it helps without increasing latency.

[amelia808]

OpenGL renderer string: Mesa Intel(R) UHD Graphics 620 (Kabylake GT2)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 19.2.6
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 4.5 (Compatibility Profile) Mesa 19.2.6
OpenGL shading language version string: 4.50
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 19.2.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:```

None of the VSync mechanism options change anything. 

[tildearrow]

Now that is abnormal...

1. Does KWin have the same issue? (I doubt though)
2. Can you output your xrandr? Maybe a slower monitor is causing this...?

[amelia808]

KWin works perfectly fine

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
   1920x1080     60.01*+  60.01    59.97    59.96    59.93  
   1680x1050     59.95    59.88  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1280x800      59.99    59.97    59.81    59.91  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   640x400       59.88    59.98  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
HDMI-1 disconnected (normal left inverted right x axis y axis)

This is also on a laptop so It couldn't be a monitor issue.

[tildearrow]

OK, thanks. I will have to look at this as soon as I can. I just don't have time since I am dealing with some problems with my ISP.

[tildearrow]

I have been looking at the code, and found an un-needed VSync wait. Is it possible for you to test again with commit 61465280ee9d6e9e3b7f33506a9002d3d3c859dd?

[amelia808]

I have been looking at the code, and found an un-needed VSync wait. Is it possible for you to test again with commit 6146528?

Seems to be fixed now, Thanks for the patch.