tools -> scripts

scripts/display-resolution.sh

@@ -0,0 +1,55 @@
+#!/usr/bin/env bash
+# https://gist.github.com/anthonyaxenov/c16e1181d4b8a8644c57ec8a1f6cf21c
+#########################################################################
+#                                                                       #
+# Set output resolution                                                 #
+#                                                                       #
+# Author: Anthony Axenov (Антон Аксенов)                                #
+# Version: 1.0                                                          #
+# License: WTFPLv2                                                      #
+#                                                                       #
+#########################################################################
+#                                                                       #
+# Using this script you can change your output resolution               #
+# to any one you need. Just adjust some vars below and run script       #
+# (chmod +x needed).                                                    #
+#                                                                       #
+#########################################################################
+
+# Set output name to work with. You can get it via 'xrandr --listactivemonitors'
+output="HDMI-3"
+# Set width of this output in px
+width=1920
+# Set height of this output in px
+height=1080
+# Set refresh rate in Hz of this output in px
+refresh=120
+
+# Sometimes cvt and gtf generates different modelines.
+# You can play around and look which of them gives best result:
+modeline=$(cvt ${width} ${height} ${refresh} | grep "Modeline")
+# modeline=$(gtf ${width} ${height} ${refresh} | grep "Modeline")
+
+# Some important data needed to xrandr:
+modename="${width}x${height}@${refresh}_my"
+params=$(echo "$modeline" | sed "s|^\s*Modeline\s*\"[0-9x_.]*\"\s*||")
+
+echo "Set resolution ${width}x${height}@${refresh} on output $output:"
+echo "$modename $params"
+
+# Simple logic:
+# 1. Switch output to safe mode which always exists (I believe) to avoid errors
+xrandr --output $output --mode 640x480 --verbose
+# 2. If output aready have our mode -- we must delete it to avoid errors
+if $(xrandr | grep -q "$modename"); then
+    # 2.1. Detach mode from output
+    xrandr --delmode $output $modename
+    # 2.2. Remove mode itself
+    xrandr --rmmode $modename
+fi
+# 3. Create new mode with freshly generated parameters
+xrandr --newmode $modename $params --verbose
+# 4. Attach mode to our output
+xrandr --addmode $output $modename --verbose
+# 5. Switch output to this mode immidiately
+xrandr --output $output --mode $modename --refresh $refresh --verbose