33
votes
Accepted
Adjusting the Brightness of the Official Touchscreen Display
The driver for the screen provides an interface through /sys/. To turn the screen on you can use the command:
echo 0 > /sys/class/backlight/rpi_backlight/bl_power
and to turn it off:
echo 1 > ...
- 11.9k
28
votes
How do I prevent the screen from going blank?
The other solutions here did not work for me (fresh Raspbian, boot to GUI). Instead, this worked:
Open up /etc/lightdm/lightdm.conf using your favorite text editor (I prefer nano).
Look for the line #...
- 7,116
23
votes
Accepted
How to permanently hide mouse pointer or cursor on Raspberry PI?
I simply added a nocursor option as follows in the file (/etc/lightdm/lightdm.conf)
xserver-command = X -nocursor
and it worked as it should. No cursor is displayed whatsoever. You can still put your ...
- 1,025
23
votes
Keep HDMI off on boot
There is a few things you can try:
Edit /etc/rc.local and add the following lines above exit 0:
Disable HDMI
/usr/bin/tvservice -o
this will turn off the display, but only somewhere during the boot ...
- 488
22
votes
Accepted
conflicting dtoverlays
As it turns out several overlays can be loaded by adding multiple dtoverlay variables:
In this case:
dtoverlay=4dpi-3x
dtoverlay=w1-gpio
- 757
18
votes
Accepted
Using Pi 3 for wireless display/miracast
I have developed lazycast that is designed to work on Raspberry Pi 3. lazycast follows (most of) the wifi display specification (commercially known as Miracast) and uses wifi p2p (commercially known ...
- 196
12
votes
Raspberry Pi DPI only works over short distances. Why?
All cables have a length limit. When you exceed that length limit, the signals in the cable attenuate due to resistance of the cable, get deformed due to capacitance and inductance in the cable, and ...
- 981
11
votes
Adjusting the Brightness of the Official Touchscreen Display
I've made a Python package for this: github.com/linusg/rpi-backlight. Now you don't need to implement this yourself anymore.
(GIF is outdated because API was changed quite a bit in v2, sorry... Below ...
- 432
10
votes
How do I prevent the screen from going blank?
To prevent the screen from going blank try adding consoleblank=0 to the end of the first line of /boot/cmdline.txt
Source
- 221
9
votes
How to Wake the Raspbery Pi Display Without Disabling The Screensaver
You have to define which display to use first :
export DISPLAY=:0
xset s reset
Hope this helps
- 191
8
votes
Screen Flashing
In /boot/config.txt, uncomment the line with config_hdmi_boost and change its value to =6.
The suggested value of 4 was still too low for a Samsung 205BW monitor connected to a Raspberry Pi 3.
- 445
8
votes
Accepted
Black frame around 1080p screen
In your /boot/config.txt file try changing disable_overscan=1 and see what that does for the borders. If that does not help, leave disable_overscan=1 and then try changing these values as well.
...
- 436
7
votes
Screen Flashing
I'm not sure this will help, but had this similar problem on my Raspberry (old 1 Model B) also yesterday. I had not noticed it before because I only recently started using it with X and a monitor. ...
- 71
7
votes
# symbol not on my keyboard
The problem is that your keyboard is using the default UK mapping. Assuming you are using Raspbian you can use the raspi-config utility to change the keyboard layout. From the command line type sudo ...
- 34.6k
7
votes
Accepted
Why can't you connect Raspberry Pi to a Laptop via HDMI
Most laptop hdmi ports are output not input. They are designed to connect a laptop to a monitor.
There are a few that have hdmi input.
You could use VNC Viewer on your laptop to view the Pi screen (by ...
- 6,847
6
votes
Error when attempting to create Python GUI using Tkinter: "no display name and no $DISPLAY environment variable"
I solved it with these two commands:
export DISPLAY=0.0
xhost +
- 61
6
votes
Error when attempting to create Python GUI using Tkinter: "no display name and no $DISPLAY environment variable"
Here is my solution. This works for SSH terminal, or crontab:
import Tkinter
import sys
import os
if os.environ.get('DISPLAY','') == '':
print('no display found. Using :0.0')
os.environ....
- 61
5
votes
Make display go to sleep
There is an undocumented option in /boot/config.txt that might help you:
hdmi_blanking=1
Tried and tested under Raspbian "Jessie" (not Raspbmc). The display goes to sleep after about 10 minutes of ...
- 226
5
votes
Screen Flashing
I finally solved this issue by changing /boot/config.txt. By setting hdmi_group=1 and hdmi_mode=25, which will set the refresh rate to 100Hz.
- 51
5
votes
Connect Raspberry Pi to Macintosh 128k's cathodic screen
It will be difficult, since little to no standards were employed. It was a cutting edge device at the time, almost every part of it was made for purpose, since there weren't all that many established ...
- 566
5
votes
Accepted
7 segment display connecting through DSI Display port?
There's no way for anyone to know anything about that board and where its connections might go. I absolutely would not connect it to the Pi's DSI connector without first knowing exactly what each of ...
- 10.7k
5
votes
What models of Raspberry Pi is the official 7" touchscreen compatible with?
It is not compatible. The Pi Zero (all models so far) lacks the required connector.
According to Element 14, the display is compatible with:
Raspberry Pi 3 Model B
Raspberry Pi 2 Model B
Raspberry ...
- 405
5
votes
Is it possible to power a 3b+ and the display with the poe hat?
I had the exact problem as you. Found it was not possible due to the form factor of the Pi 3B+ when a PoE Hat affixed to it to fit in the "Smarti Pi Touch" case. Used a PoE Splitter (£9.90 in VAT ...
- 1,647
5
votes
Raspberry Pi DPI only works over short distances. Why?
Your Hyperpixel has a resolution of 800 x 480 x 60fps, so the data rate is 23,040,000 pixels per second, plus some gaps for synchronisation.
You can't send such a fast signal over an arbitrarily long ...
- 522
4
votes
libCEC not working on LG TV (LD330)
LG TVs do not support suspending over CEC.
Hardware workaround for LG TVs with WebOS not supporting CEC STANDBY https://github.com/ALFISYS/cec_lg_off
If you interested, take a look into my kodi ...
- 141
4
votes
Accepted
Is it possible to use multiple monitors or displays?
Almost seven years after this question was asked, Raspberry Pi 4 includes support for dual displays.
From Raspberry Pi 4 product page:
with Raspberry Pi 4, you can run two monitors at once — and ...
- 226
4
votes
How do I prevent the screen from going blank?
What worked for me was editing ~/.config/lxsession/LXDE-pi/autostart and commenting out the screensaver, all the other xset commands didn't seem to affect it when it is started here:
@lxpanel --...
- 141
4
votes
Is there any way to get redshift to work?
The closed source graphics driver doesn't expose gamma ramps, which are what redshift relies on. To get gamma ramps, you'll need to switch to the open source graphics driver.
Using raspi-config (...
- 705
4
votes
Raspberry PI 2 as screen mirroring adapter
You can install any VNC server app on your Android, such as VMLite VNC Server. On the RPi you can use a VNC viewer, such as SSVNC (sudo apt-get install ssvnc) or xtightvncviewer (sudo apt-get install ...
- 5,033
Only top scored, non community-wiki answers of a minimum length are eligible