Difference between revisions of "Display"

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Revision as of 00:41, 13 March 2019

Landscape mode

Rotate the screen

You can rotate adding the following configuration file: /etc/X11/xorg.conf.d/00-fbdev-rotate.conf

Section "Device"
  Identifier "LCD"
  Driver "fbdev"
  Option "Rotate" "CW"
EndSection

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: /etc/udev/rules.d/90-device-samsung-i9070.rules And add one of the following line:

# 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"

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:

sudo nano /etc/udev/rules.d/90-android-touch-dev.rules
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"

Display Power Management

To control display from a terminal, first set DISPLAY environment variable:

export DISPLAY=:0.0

The xset command can be used to turn display on and off, or set a display timeout value.

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