ddcutil: add page (#7275)

pages/linux/ddcutil.md

@@ -0,0 +1,21 @@
+# ddcutil
+
+> Control the settings of connected displays via DDC/CI.
+> This command requires the kernel module `i2c-dev` to be loaded. See also: `modprobe`.
+> More information: <https://www.ddcutil.com>.
+
+- List all compatible displays:
+
+`ddcutil detect`
+
+- Change the brightness (option 0x10) of display 1 to 50%:
+
+`ddcutil --display {{1}} setvcp {{10}} {{50}}`
+
+- Increase the contrast (option 0x12) of display 1 by 5%:
+
+`ddcutil -d {{1}} setvcp {{12}} {{+}} {{5}}`
+
+- Read the settings of display 1:
+
+`ddcutil -d {{1}} getvcp {{ALL}}`