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Per modificare la risoluzione/refresh rate in output seguire l'help di xrandr.
In particolare i comandi utili per visualizzare tutte le varie combinazioni dei vari output è:


xrandr -q
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 32767 x 32767
LVDS1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
   1366x768       60.0*+
   1360x768       59.8     60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0 +  120.0*    85.0     75.1     70.1  
   1920x1080      60.0     50.0     59.9     30.0     24.0     30.0     24.0  
   1920x1080i     60.1     50.0     50.0     60.0  
   1600x1200      60.0  
   1680x1050      59.9  
   1680x945       60.0  
   1400x1050      74.9     59.9  
   1600x900       60.0  
   1280x1024      85.0     75.0     60.0  
   1440x900       84.8     75.0     59.9  
   1280x960       85.0     60.0  
   1366x768       59.8  
   1360x768      120.0     60.0  
   1280x800       84.9     74.9     59.9  
   1152x864       75.0  
   1280x768      119.8     84.8     74.9     60.0  
   1280x720       60.0     50.0     59.9  
   1440x576i      50.1  
   1024x768i      87.1  
   1440x480i      60.1     60.1  
   1024x576       60.0  
   800x600       120.0     85.1     72.2     75.0     60.3     56.2  
   720x576        50.0  
   848x480        60.0  
   720x480        60.0     59.9  
   640x480       120.0     85.0     75.0     72.8     66.7     60.0     59.9  
   720x400        85.0  
   640x400        85.1  
   640x350        85.1  
DP1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)



Una volta scelta la risoluzione chi più ci aggrada, effettuare il comando seguente per settarla (nel nostro caso andiamo a settare l'output dell'HDMI ad una risoluzione a 1024x768 con un refresh rate di 120hz):


xrandr --output HDMI1 --mode 1024x768 --rate 120.0



Per quanto riguarda l'help:


xrandr --help
usage: xrandr [options]
  where options are:
  --display <display> or -d <display>
  --help
  -o <normal,inverted,left,right,0,1,2,3>
            or --orientation <normal,inverted,left,right,0,1,2,3>
  -q        or --query
  -s <size>/<width>x<height> or --size <size>/<width>x<height>
  -r <rate> or --rate <rate> or --refresh <rate>
  -v        or --version
  -x        (reflect in x)
  -y        (reflect in y)
  --screen <screen>
  --verbose
  --current
  --dryrun
  --nograb
  --prop or --properties
  --fb <width>x<height>
  --fbmm <width>x<height>
  --dpi <dpi>/<output>
  --output <output>
      --auto
      --mode <mode>
      --preferred
      --pos <x>x<y>
      --rate <rate> or --refresh <rate>
      --reflect normal,x,y,xy
      --rotate normal,inverted,left,right
      --left-of <output>
      --right-of <output>
      --above <output>
      --below <output>
      --same-as <output>
      --set <property> <value>
      --scale <x>x<y>
      --scale-from <w>x<h>
      --transform <a>,<b>,<c>,<d>,<e>,<f>,<g>,<h>,<i>
      --off
      --crtc <crtc>
      --panning <w>x<h>[+<x>+<y>[/<track:w>x<h>+<x>+<y>[/<border:l>/<t>/<r>/<b>]]]
      --gamma <r>:<g>:<b>
      --primary
  --noprimary
  --newmode <name> <clock MHz>
            <hdisp> <hsync-start> <hsync-end> <htotal>
            <vdisp> <vsync-start> <vsync-end> <vtotal>
            [flags...]
            Valid flags: +HSync -HSync +VSync -VSync
                         +CSync -CSync CSync Interlace DoubleScan
  --rmmode <name>
  --addmode <output> <name>
  --delmode <output> <name>
  --listproviders
  --setprovideroutputsource <prov-xid> <source-xid>
  --setprovideroffloadsink <prov-xid> <sink-xid>

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