I don't understand why I have to different refresh rate on my system:
Here is my xrandr output:
$ xrandr
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
DVI-I-1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 443mm x 249mm
1600x900 60.0*+
1280x1024 75.0 60.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
And my glxgears output:
$ glxgears
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
601 frames in 5.0 seconds = 119.982 FPS
600 frames in 5.0 seconds = 119.916 FPS
600 frames in 5.0 seconds = 119.916 FPS
600 frames in 5.0 seconds = 119.916 FPS
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
after 4999 requests (4999 known processed) with 0 events remaining.
I have an nvidea graphics boards.
xrandr --rate 120
to see if it's supported?