added display wiki page

Display.mw

+== Landscape mode ==
+
+=== Rotate the screen ===
+
+You can rotate adding the following configuration file: <code>/etc/X11/xorg.conf.d/00-fbdev-rotate.conf</code>
+<pre>
+Section "Device"
+  Identifier "LCD"
+  Driver "fbdev"
+  Option "Rotate" "CW"
+EndSection
+</pre>
+
+Reboot ,Then open the display app and set the correct resolution.
+
+=== Rotate the touchscreen ===
+In order to also rotate the touchscreen you need to change the udev rule: <code>/etc/udev/rules.d/90-device-samsung-i9070.rules</code>
+And add one of the following line:
+<pre>
+# Left - 90 degree clockwise
+ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0"
+# 180 degree clockwise
+ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1"
+# Right - 270 degree clockwise
+ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1"
+# reflect along y axis
+ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 1 0 0"
+</pre>
+and reboot udev or the device.
+
+NT: If you use the rotate screen code as it is use the # Right option to rotate the touch on the direction of rotated screen.
+
+== Calibrate the touchscreen ==
+If you rotate the screen, change/add a value in this file:
+<pre>
+sudo nano /etc/udev/rules.d/90-android-touch-dev.rules
+</pre>
+<pre>
+ENV{ID_INPUT}="1", ENV{ID_INPUT_TOUCHSCREEN}="1", \
+# default			ENV{LIBINPUT_CALIBRATION_MATRIX}="1 0 0 0 1 0"
+# Left - 90 degree clockwise	ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0"
+# 180 degree clockwise		ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 0 -1 1"
+# Right - 270 degree clockwise	ENV{LIBINPUT_CALIBRATION_MATRIX}="0 1 0 -1 0 1"
+# reflect along y axis		ENV{LIBINPUT_CALIBRATION_MATRIX}="-1 0 1 1 0 0"
+</pre>
+
+== Display Power Management ==
+To control display from a terminal, first set DISPLAY environment variable:
+<source lang="shell">
+export DISPLAY=:0.0
+</source>
+
+The <B>xset</B> command can be used to turn display on and off, or set a display timeout value.
+<source lang="shell">
+xset dpms force off    # To turn off display
+xset dpms force on     # To turn the display back on
+xset q                 # Prints current display status info
+</source>
+
+
+[[Category:Guide]]