fix: touchpad setting document

doc/touchpad.md

@@ -0,0 +1,11 @@
+# Adjust speed, scrolling direction
+
+1. install `xinput`
+2. `xinput list` to find out your touchpad id
+3. `xinput list-props <device_id>` to find settings
+   ```sh
+   libinput Natural Scrolling Enabled (298):       0
+   libinput Natural Scrolling Enabled Default (299):       0
+   ```
+4. `xinput set-prop 298 1` to set Natural Scrolling
+4. `xinput set-prop 299 1` to set Natural Scrolling

gui/autorandr/postswitch

@@ -7,7 +7,7 @@ xrandr | awk '
 $2 == "connected" && $3 == "primary" {
     if (match($0, / ([0-9]+)x([0-9]+)\+([0-9]+)\+([0-9]+) (left|right)?/, m1) &&
         match($0, / ([0-9]+)mm x ([0-9]+)mm$/, m2)) {
-        DPI=m1[1]*25.4/m2[m1[5]?2:1]
+        DPI=m1[1]*25.4/m2[m1[5]?2:1]*0.8
         printf "Xft.dpi: %i", DPI
     }
 }