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 #...
- 7,156
26
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 ...
- 1,063
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
21
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 ...
- 226
12
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(GIF is outdated because API was changed quite a bit in v2, sorry...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 ...
- 442
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 ...
- 991
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
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.
- 455
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
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 ...
- 6,998
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
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 ...
- 1,667
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 ...
- 597
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
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
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
How to permanently hide mouse pointer or cursor on Raspberry PI?
To work with any X server (I'm using the stretch version),
Edit the /usr/bin/startx file and change the defaultserverargs line to:
defaultserverargs="-nocursor"
- 41
4
votes
How to set the video resolution over composite?
I read at https://discourse.osmc.tv/t/composite-sd-resolution-of-osmc-skin-video-output/5445/3) that
Composite is fixed resolution (720x480@60i for NTSC, 720x576@50i for PAL).
So you cannot change ...
- 977
4
votes
Accepted
How to connect a Raspberry Pi to an RCA based display with sound?
a display that has only RCA as output
I presume you mean 3 female inputs, 2 for audio and one for composite video, which in North America are generally red, white, and yellow.
The 3.5mm jack on the ...
- 59.5k
4
votes
Add 24 monitors to PC using Raspberry Pi?
It turns out that there's a reasonably well established project for doing just this. The PiWall project's overview states:
A master computer, which can be either a Raspberry Pi or a Linux PC,
is ...
- 10.7k
4
votes
Raspberry Pi Monitor goes black periodically
id say that it may likely be due to power draw, your adapter(the hdmi to vga cable) you are using. If it isn't powered by itself it may be the cause of your problems, as the pi wasn't designed to ...
- 2,383
4
votes
Accepted
Using RPi touchscreen as primary display, how to display image on HDMI?
Summary: Finally, my solution used the Kivy framework. Kivy is a graphical framework for Python and, critically for my app, has the ability to output to both the RPi's LCD touchscreen and HDMI. Kivy ...
- 91
4
votes
Accepted
Is it possible to disable the boot messages and terminal on the PiTFT while using fbcp
I manage to remove boot messages by modifying /boot/cmdline.txt, adding
fbcon=map:2
This command allocate console to an unavailable framebuffer. You can get more info about this command here and ...
- 1,416
4
votes
Working display setting for Android Things on Raspberry Pi 3 with 3.5 inch Waveshare?
I got touch input working for my Waveshare touch input display running on Android Things.
There is a demonstration on Youtube. I also go it working on a KeDei 3.5" touch input display. They both use ...
- 141
Only top scored, non community-wiki answers of a minimum length are eligible