Le taux de rafraîchissement est de 120 Hz alors que mon écran est à 60 Hz.

Je ne comprends pas pourquoi je dois avoir un taux de rafraîchissement différent sur mon système :

Voici mon xrandr sortie :

$ 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)

Et mon glxgears sortie :

$ 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.

J'ai une carte graphique nvidea.