Questions tagged [config.txt]

This file is parsed by the GPU before the initialisation of the ARM core. It can be used to set various parameters to alter the behaviour of the system, such as display resolution or overclocking settings.

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Config.txt for connecting RPI4 to Light Projector [duplicate]

I am using this code in the config.txt and I am not able to connect properly to the projector. It is possible to decide to display or not an image but it isn't possible to turn On or Off the projector....
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Debian Buster w/ Overclocking

Due to software requirements I'm running Debian Buster and am hoping to be able to give my Pi4 a slight overclock. I've created a confix.txt file in /boot with the following content: over_voltage=2 ...
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72 views

Setting precise voltage offsets with over_voltage

On the BCM2711, the base VCore was greatly lowered from previous processors, though the over_voltage setting still uses 0.025V increments. On my Pi 4, vcgencmd measure_volts returns 0.8563V when not ...
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ds18b20 waterproof sensor not shown

I new to this.I have attached a ds18b120 waterproof sensor with header directly to my Pi 3 Model A.However it is not showing up in the terminal. I have enabled 1 Wire in the interface. I am on Linux ...
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config.txt conditional filter for 7" touch display?

I just bought a brand new Pi4 and official 7" touchscreen display along with case. I also have another existing Pi with HDMI monitor. I'm running a custom image based on Raspbian Lite plus ...
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53 views

How to get full UART safely on Pi4?

I need to use full UART. I was using dtoverlay=pi3-miniuart-bt to achieve this but the name suggests it's for pi3, I have pi4. Should I use miniuart-bt instead, or disable-bt as I would want to turn ...
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20 views

Pi keeps changing source

I have a problem with my Pi. Every time I turn on the TV it automatically changes the source to my Pi. I tried following this thread : stopping RaspPi / raspbmc from auto changing source on tv ...
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98 views

Second Acer monitor X183H native 1366 x 768 HDMI-to-VGA adapters “Input Not Supported” (*First AcerG195W works great)

#Raspberry Pi w/ latest raspbian (RaspberryOS) (which I have connected as a desktop computer) https://www.raspberrypi.org/products/raspberry-pi-4-model-b/specifications/?resellerType=home #Connection ...
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raspberry pi 4 txrx ttyAMA0 reports a buardrate of 0 despite having tx-rx connection

I am trying to get the LPC1768 to send a "Hello world!" message through its TX-RX pins, but the raspberry pi reports a buad rate of 0 when connected to it via TX-RX: What I've tried: -. ...
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379 views

Ultra-wide monitor support - Screen resolution, Video and Audio Raspberry Pi 4 B

Ultra-wide monitor specs: 34 inch WHFD (2560 x 1080) IPS Display (21:9) - HD 10 AMD Free sync OS: Arch linux with Openbox (lightdm) Issues: Managed to get 2560x1080 pixels with "...
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80 views

Use both internal and external activity LED?

With something like dtoverlay=act-led,gpio=26 in boot/config.txt I can enable an external activity LED, which is useful if the Pi is in a case and the on-board LED cannot be seen. Unfortunatelly, ...
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Monitor settings not persisting across reboot

I have two monitors connected to a RPi 4B rev 1.4 running Raspbian 10. When I boot, both monitors are mirrored, so I go to Preferences > Screen Configuration and set the monitors up how I want (...
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663 views

Raspberry Pi 4 B GPIO boot and shutdown

I've been doing some research on power buttons for the Raspberry Pi, but I'm having quite a hard time finding information. Right now, I have button working on GPIO5, and when I connect it to the ...
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75 views

How to get netboot debug info from start.elf

I am attempting to netboot Ubuntu 20.04.1LTS arm64 on a Raspberry Pi 3B v1.2. To do this, I have replaced the Ubuntu u-boot boot loader with the Pi boot loader, as instructed in the Ubuntu ...
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Raspberry Pi 4B screen tearing

I want to build a smooth experience on a Raspberry PI, and screen tearing is destroying transitions and animations on a web application viewed in chromium in full-screen, I'm using a 7" ...
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28 views

Force Pi 3B+ Raspian (not NOOBS) to boot in composite mode automatically (using config.txt?)

Please do not echo the noise of similar questions and answers. None seem to meet my need. What is the minimum set of config.txt commands that I need to ensure that my Pi 3B+ outputs to composite when ...
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external eMMC doesnt get detected

my setup is an IO Board V3.0 with an CM3L. I have an external eMMC + Adapter i connected to the pins 22-27 of my IO Board. Im using the raspbian buster (2020-05-27). To connect the eMMC-adapter to the ...
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Best resource for raspi-config equivalents in config.txt

I am trying to figure out how to edit my /boot/config.txt with the same functionality implicit in raspi-config. For example, I'd like to know how to enable/disable for "P6 Serial" in this ...
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51 views

Can't find ~/.config?

I'm trying to follow this tutorial: at one step I'm supposed to change the autostart file with this command: sudo nano ~/.config/lxsession/LXDE-pi/autostart but when I cd into my /home/pi folder (...
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412 views

Overscan on Ubuntu 20.4 LTS

I have recently been working on getting a server running on the pi 3. I installed the server but there was a lot of overscan, and at the time I didn't know what that was. I searched on the web for a ...
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754 views

Ubuntu GPIO mapping and port configuration

I turned from Raspbian to Ubuntu 19 32bit on my RPI4 because I need this distribution. I downloaded it using the RPI Imager. I had a working pinout on Raspbian, mapped on config.txt for the I2C and ...
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Trouble Detecting Devices on Added I2C Buses

I decided to add additional i2c buses to my raspberry pi 4 through the use of gpios and overlays. I first came across this idea from this post by the instructables. Through editing the config.txt file ...
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Ifconfig, interrupt device and enc28J60 spi1

Good morning I have configured and connected an enc28j60 card to the spi1 port of my raspberry pi3 and I have found the error in the photo that does not make the ethernet port work. I ask you for help ...
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151 views

Outputing DMX using Bitwizard Hat

I have a Raspberry Pi 4B with a Bitwizard DMX Hat which uses the serial port. I try to output DMX from the board to a LED light using QLC+ software, but it's not working. I tried some commands and I ...
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Waveshare RS485 CAN hat over raspberry pi 3A+

So I have been at least trying to connect to the hat from the Pi, the following is my configuration: I follow the manual set in this link: https://www.waveshare.com/w/upload/2/29/RS485-CAN-HAT-user-...
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SPI Not working when chip select is connected to ground, works fine when connected to CE 0,1 or 2

I am working on MFRC522 sensors. However I need more than 3 SPI Devices. The 3 works fine except when I want to connect chip select to GPIO, It does not work. I tried a single spi device by connecting ...
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96 views

overscan ignored in raspberry pi

I configured the pi screen to be horizontal (using display_rotate=1) but as you can see in the image the scree is not in full screen: it start from about 1/4 from left of the screen I use a manual ...
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522 views

Raspberry Pi 4 shutdown with no Power LED (red) and no ACT LED (green)

I've recently modified my boot/config.txt to include the following lines: dtoverlay=gpio-poweroff,gpiopin=9,active_low=n dtoverlay=gpio-poweroff,gpiopin=10,active_low=n This works exactly how I ...
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Setting up multiple I2C buses using dtoverlay

I am trying to set up multiple I2C interfaces on my pi. I have added the following lines to my /boot/config.txt and rebooted: dtoverlay=i2c-gpio,bus=4,i2c_gpio_delay_us=1,i2c_gpio_sda=29,...
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Boolean logic in config.txt conditional filters

When using conditional filters in config.txt, is it possible to use boolean logic for specific GPIO combinations? I tried the following and it did not work: [gpio24=0,gpio25=0,gpio26=0,gpio27=0] ...
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86 views

Wifi disabled after reconfiguring HDMI

I am using a Raspberry Pi 3 A+ with Raspbian Stretch (updated/upgraded about a month ago), connected to a Manga Screen 2: http://wiki.thing-printer.com/index.php?title=Manga_Screen_2 I have used this ...
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SPI0 and UART0 interference caused by SPI interrupt

I have a raspberry CM3 running a custom Linux version created by buildroot (kernel: 4.19.44-v7). The CM3 is configured to be part of a measurement system that is used on a quad-bike (so a lot of ...
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59 views

Raspberry PI config.txt gets recreated and the custom modifications ignored

I have encountered a similar problem to; Can't Access TTY: Job Control Turned Off I followed the solution by adding avoid_safe_mode=1 to config.txt but somehow the config.txt gets recreated and ...
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Raspberry Pi Multiple I2C Busses

EDIT: Other people I've talked to and one poster here (since deleted) have said that they have the same issue while going through the Instructables tutorial to set up multiple I2C busses. There are ...
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EDID problem with different monitors

I've got 2 monitors I use with a pi. The HP monitor self identifies root@raspberrypi:/home/pi# tvservice -n device_name=HWP-HP_L1755 & it is happy with the preferred hdmi settings root@...
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Toggle UART (enable_uart=1) without rebooting

Which pins can can I manually toggle to enable or disable UART on a Raspberry Pi Zero or 3B+ without rebooting? As I understand, /boot/config.txt is parsed before Linux is started, but I don't mind ...
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No video on SV-3 instrument viewer

When I set the Pi (Zero) up with the required 640x480 60Hz mode in config.txt the SV-3 reports no signal. But if I plug a VGA Acer monitor in to the Pi and then unplug it, plugging in the SV-3 works! ...
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944 views

Does hdmi_cvt need the '=' in config.txt?

I've got an HDMI touchscreen for my Raspberry Pi, and the instructions say to add the following to the end of the config.txt file: max_usb_current=1 hdmi_group=2 hdmi_mode=1 hdmi_mode=87 hdmi_cvt ...
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Cant find /home/pi/.config/lxsession/LXDE-pi/autostart

I am trying to follow this guide to set up a pi 3+ as kiosk but I get stuck at step 10. It says that this directory doesn't exist. It seems that there is no .config file. Any help is much appreciated ...
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gpio-shutdown doesn't seem to have an effect

We are trying to have the Pi shut down gracefully when power is removed. We have a battery connected so that it will have time to shut down. So far, our attempts to use gpio-shutdown have been ...
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1answer
806 views

Setting official touchscreen display boot-time brightness

I've got an official display, and having found other questions about setting the brightness I know I can change the brightness, and make a script that will run on boot, but that means the screen will ...
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Read pin (power led) from port expander on ic2-0 at config.txt

In config.txt you can have conditional booting based on the GPIO pin level, e.g. the gpio4=1 line. Is it also possible to access the pin on the GPIO port extender at i2c-0, or is this something ...
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398 views

Fallback kernel.img possible in config.txt

I have a raspberry with a customized OS. The image it should load is described in the config.txt on the boot partition. The image is called zImage and the line in the config.txt is: kernel=zImage I ...
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337 views

How to fix adafruit 7" display resolution problem on PI3?

I recently bought adafruit 7" display to be used with my PI3 to see if it will work. Well, it sort of works. The screen comes up everything is displayed but the resolution is screwed up. I have tried ...
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498 views

problem with video HDMI video output, distorted image

I am playing with a Rpi3 distro (Android Raspand) and I can't see anything. Image is twisted and distorted, please see how I am playing with config.txt following this guide https://raspberrypi....
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610 views

Red camera LED fails to turn off

I am using Raspbian 4.9.35-v7+ (3B+) and the camera: https://www.adafruit.com/product/1567. This may be flagged as a duplicate to previous questions under similar titles; however, none of their ...
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234 views

Error on init/boot '/init: line 27: can't create /sys/class/leds/led0/trigger'

Sorry for asking the same question twice, but it seems I can't fix the problem yet. I have a web server running on my pi. One day I found that my server is down and I try to access my pi using VNC and ...
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1answer
2k views

Does display_rotate still work?

I'm trying to use this runtime config.txt parameter under Raspbian Stretch and an external LED monitor on the HDMI port to no effect. It's hard to tell from posts here and elsewhere if this setting ...
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528 views

RPi3 on Sony Bravia HDMI Produces Flickering Lines

After working for a while, and with various distributions and SDs, my Raspberry Pi 3 no longer properly works with my Sony Bravia. With the HDMI inserted it now displays flickering, changing lines. It ...
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255 views

Import settings from other file into config.txt

Is it possible to import settings from another file into config.txt? As I imagine config.txt example content: ... # Uncomment this to enable the lirc-rpi module #dtoverlay=lirc-rpi # Additional ...