Difference between revisions of "Display"

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(added scaling and removed duplicate guide)
m (Rotate the screen: add infos for other rotation angles - UD is not obvious...)
 
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Reboot ,Then open the display app and set the correct resolution.
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Valid values for "Rotate" are "CW" (clockwise, 90 degrees), "UD" (upside down, 180 degrees) and "CCW" (counter clockwise, 270 degrees), see fbdev(4) man page.
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Reboot, then open the display app and set the correct resolution.
  
 
=== Rotate the touchscreen ===
 
=== Rotate the touchscreen ===

Latest revision as of 11:27, 22 September 2019

Landscape mode

All this fixes need device reboot.

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

Valid values for "Rotate" are "CW" (clockwise, 90 degrees), "UD" (upside down, 180 degrees) and "CCW" (counter clockwise, 270 degrees), see fbdev(4) man page.

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 by

/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"

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.

Scaling

Xfce4 and Mate Desktop supports gtk apps scaling out of the box. As for qt app you need to set up environment variable by

sudo nano /etc/environment

And past this lines after comments

QT_SCALE_FACTOR=2
QT_AUTO_SCREEN_SCALE_FACTOR=2


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

Troubleshooting

Check the logs with logread -f | grep x11