xrdb -query -all | grep dpi:
Xft.dpi:	48

xdpyinfo | grep dots:
  resolution:    48x96 dots per inch

xrandr:
Screen 0: minimum 320 x 175, current 3600 x 1200, maximum 8192 x 4096
default connected 3600x1200+0+0 0mm x 0mm
   8192x4096       5.0  
   5120x3200      10.0  
   3840x2880      10.0  
   3840x2560      10.0  
   3840x2048      10.0  
   3840x2160      10.0  
   2048x2048      10.0  
   2560x1600      10.0  
   1920x1440      20.0  
   1920x1200      10.0  
   1920x1080      10.0  
   1600x1200      10.0  
   1680x1050      10.0  
   1600x900       20.0  
   1400x1050      75.0     60.0  
   1440x900       20.0  
   1280x1024      20.0  
   1366x768       60.0  
   1280x800       20.0  
   1024x768       25.0     20.0     87.0  
   1024x600       25.0  
   800x600        25.0  
   320x200        85.0  
   6400x4096       5.0  
   4720x3840      10.0  
   6400x2560       5.0  
   5120x2880      10.0  
   6400x2160      10.0  
   5280x2560       5.0  
   5120x2560       5.0  
   5760x2160      10.0  
   4400x2560      10.0  
   5280x1920       5.0  
   4096x2304      20.0  
   4096x2160      10.0  
   3360x2560      10.0  
   5680x1440      15.0  
   3120x2560      10.0  
   3072x2560      10.0  
   3000x2560      10.0  
   4000x1660      20.0  
   5496x1200      25.0  
   4480x1440      10.0  
   5280x1200      25.0  
   4240x1440      10.0  
   4160x1440      10.0  
   4800x1200      10.0  
   4000x1440      20.0  
   3200x1800      30.0  
   2560x2240      20.0  
   5280x1080      25.0  
   3904x1440      10.0  
   2680x2074      25.0  
   3008x1692      20.0  
   2880x1620      60.0  
   3840x1200      20.0  
   2728x1680      25.0  
   3600x1200      20.0* 
   3520x1196      20.0  
   3840x1080      20.0  
   3864x1050      20.0  
   3600x1080      20.0  
   2560x1440      10.0  
   2560x1400      50.0  
   3288x1080      10.0  
   3360x1050      60.0  
   3200x1080      50.0  
   3120x1050      60.0  
   2048x1536      20.0  
   2720x1024      25.0  
   1728x1520      50.0  
   1856x1392      75.0     60.0  
   1792x1344      75.0     60.0  
   2048x1152      60.0     50.0  
   1920x960       50.0  
   1400x900       60.0  
   1280x960       85.0     60.0  
   1360x768       20.0  
   800x1280       20.0  
   1152x864       75.0  
   800x1242       20.0  
   1280x768       20.0  
   1280x762       20.0  
   1280x720       50.0     25.0  
   720x1280       25.0  
   720x1242       25.0  
   1280x682       25.0  
   768x1024       25.0     20.0  
   768x986        25.0  
   1024x730       25.0  
   960x720        85.0     75.0     60.0  
   1024x640       50.0  
   928x696        75.0     60.0  
   600x1024       25.0  
   896x672        75.0     60.0  
   600x986        25.0  
   1024x576       60.0  
   1024x562       25.0  
   832x624        75.0  
   960x540        60.0  
   536x960        25.0  
   960x536        25.0  
   536x922        25.0  
   600x800        25.0  
   960x498        25.0  
   600x762        25.0  
   800x562        25.0  
   864x486        60.0  
   480x854        25.0  
   848x480        25.0  
   480x810        25.0  
   480x800        25.0  
   800x480        25.0  
   848x442        25.0  
   700x525        75.0     60.0  
   480x762        25.0  
   640x512        85.0     75.0     60.0  
   640x480        85.0     75.0     73.0     60.0  
   720x405        60.0  
   720x400        85.0  
   640x400        85.0  
   576x432        75.0  
   640x360        49.0  
   640x350        85.0  
   512x384        87.0     85.0     75.0     70.0     60.0  
   416x312        75.0  
   400x300        85.0     75.0     72.0     60.0     56.0  
   320x240        85.0     75.0     73.0     60.0  
   360x200        85.0  
   320x175        85.0