Skip to main content

Questions tagged [framebuffer]

related to Linux `fbdev` abstraction (a.k.a. Linux framebuffer), as well as to accessing the framebuffer (a part of video memory) in general

Filter by
Sorted by
Tagged with
0 votes
1 answer
232 views

Low resolution in the EFI/VGA early boot framebuffer/console (and in GRUB)

When I boot my Linux machine with UEFI and grub2, I get only few graphic modes (resolution modes) available. And both of them are really smaller than my monitor/screen. For example, the boot console ...
melonfsck's user avatar
4 votes
0 answers
78 views

How do I change the framebuffer resolution at runtime without legacy /dev/fb0?

I have a server in production which was booted with a 1080p widescreen monitor attached and it used that when it automatically selected that resolution for the console on boot. Currently, it is ...
penguin359's user avatar
  • 12.2k
1 vote
0 answers
46 views

Color range for tty

THIS IS NOT A PROBLEM ABOUT XORG I have a singleboard PC with Intel N100 with 2 HDMI ports. When arch boots, the color range changes to limited after i915 takeing over the display from UEFI ...
CreeperKong's user avatar
0 votes
1 answer
49 views

Xorg FBDEV refuses to use the specified framebuffer

I'm using Xorg with the FBDEV driver, configuration: Section "Device" Identifier "Device0" Driver "fbdev" Option "fbdev" "/dev/fb0" ...
melonfsck's user avatar
0 votes
0 answers
33 views

How to return to efifb without reboot (re activate vga console)?

When I boot my Linux machine, I have only efifb framebuffer device available at first: [ 0.642906] efifb: probing for efifb [ 0.642954] efifb: No BGRT, not showing boot graphics [ 0.642957] ...
melonfsck's user avatar
0 votes
0 answers
17 views

Is it possible to get separate framebuffers for displays on Nouveau?

I'm using a simple Nvidia GPU (gt730) to run desktop system on a home server. I'm using nouveau as the GPU driver built-in on the 6.9 latest kernel. I use FBDEV (on /dev/fb0) to run the X server. /dev/...
melonfsck's user avatar
0 votes
0 answers
25 views

How are framebuffers, graphics cards and window systems connected?

Loose TL;DR: is the framebuffer device still used in Linux today? If so, does (for example) the X window system first write to, say, /dev/fb0, and then to GPU, or does it write to GPU directly, ...
mteXD's user avatar
  • 1
0 votes
0 answers
13 views

Linux standalone OpenGL usage

I would like to ask what makes the Linux graphics stack tick and how it all works together. So far I have understood that it works like this - the Linux kernel exposes GPU drivers through the DRM ...
luksev's user avatar
  • 1
1 vote
0 answers
108 views

Boot linux in text mode and without framebuffer?

This used to be the default some years ago: Linux would boot up on a text console, 80x25 characters. I want to get back to that - this is for a number of servers that boot over the net (with PXE) - ...
j4nd3r53n's user avatar
  • 717
0 votes
0 answers
18 views

My embedded application doesn't receive keyboard events (Linux framebuffer/Qt+QML application/systemd service/VNC server)

I need to remotely control a Qt / QML application on an embedded ARM instrument. I intended to do that using VNC. This doesn't work. An USB keyboard plugged in the instrument doesn't work either. NB: ...
Jean-Loup Sabatier's user avatar
0 votes
0 answers
32 views

Booting with an NVIDIA GPU, but without nouveau

I am trying to boot a Linux system (Debian 11) with an NVIDIA GPU; I need to avoid loading the nouveau driver, which I can do if I include some options on the linux command line (in grub.cfg): ...
j4nd3r53n's user avatar
  • 717
2 votes
0 answers
153 views

How does this whole FrameBuffer, DRM, KMS stuff work in todays Linux / Kernel?

I'm confused about what is what nowadays with Linux and video support for the console interface vs X. Do the /dev/fb* items only relate to the old original framebuffer support? Does DRM create/support ...
user3161924's user avatar
0 votes
1 answer
540 views

Display images using fbi on startup using systemd

I can successfully display images using the following command: sudo fbi -T 1 /home/pi/photo-screen/photos/*.jpg -t 4 I now want to start a slide show of those pictures as soon as the Raspberry PI ...
Besi's user avatar
  • 113
2 votes
0 answers
226 views

Cannot write to /dev/fb0 in systemd-nspawn container

I've created a systemd-nspawn container in which /dev/fb1 from the host is bound as /dev/fb0. I've set PrivateUsers=off in the .nspawn config file, and the file ownership and permissions of /dev/fb0 ...
Clydog's user avatar
  • 31
1 vote
0 answers
330 views

What is the definitive (and simplest) way to use fbi on Raspberry OS Buster to display images automatically on startup?

I have made all sorts of modifications to my ACLs and even created a photos.service that starts fbi, but it only starts, and displays 1 image before the screen goes blank. I have other processes (web ...
jp314's user avatar
  • 141
1 vote
1 answer
592 views

Which service creates /dev/fb0 node?

I want to update the console-setup.service to detect screen resolution using fbset -s and adjust console font size accordingly. For fbset, I need /dev/fb0 to be present, but I don't know which service ...
Tomasz Garbus's user avatar
0 votes
1 answer
302 views

Buildroot and framebuffer

I am very new to embedded programming so please have some understanding if i sound dumb. Recently i have built a linux kernel using buildroot tool. These are the commands i used: make ...
programmer wanna be's user avatar
10 votes
2 answers
1k views

How can I get the number bytes to write per row for FrameBuffer?

Goal: I'm writing a very simple image viewer for framebuffer /dev/fb0 (something like fbi). Current state: My software takes the pixel resolution from /sys/class/graphics/fb0/virtual_size (such as ...
Garid Z.'s user avatar
  • 552
2 votes
1 answer
240 views

TERM=fbterm causes box-drawing characters (by curses) get scrambled

I'm writing TUI software on fbterm using python-curses library. To get full color in fbterm, I read it's man page and concluded I need to change environmental variable TERM to fbterm. Man page: By ...
Garid Z.'s user avatar
  • 552
0 votes
1 answer
137 views

Video rom part of iomem usage

Given some x86_64 linux stock kernel running one single GPU embedded into whatever pci-e extension board. cat-ing /proc/iomem, I can realize that some space is reserved in RAM and associated to the ...
MC68020's user avatar
  • 8,249
1 vote
1 answer
2k views

Relationship between framebuffer and a tty

A framebuffer is a device file which allows for a simplified interface to the screen. For example running the below code on a RaspberryPi with a HDMI display connected: cat /dev/urandom > /dev/fb1 ...
TheMeaningfulEngineer's user avatar
2 votes
1 answer
2k views

How to stream the linux framebuffer as video over http

I have an embedded linux system (yocto based) with a framebuffer UI (no X11) and a running web server. Now I'm asking how to "mirror" the screen contents to a web page. Think of it like a ...
Philippos's user avatar
  • 13.5k
1 vote
0 answers
153 views

Problems enabling HDMI screen framebuffer on startup for ts_calibrate

I'm running EGT on a SAMA5D4 Xplained board. It uses KMS for output to a HDMI screen. I've got a touchscreen that needs to be calibrated on the first use, I'm using ts_calibrate from tslib. I have a ...
leo8382's user avatar
  • 11
1 vote
0 answers
316 views

Debian text mode framebuffer issue - Kernel 5.14

I can't fix the startup issue I'm facing since I updated my Debian (bullseye) to backports distribution in order to get the Kernel 5.14 As per my researching it seems to be something related to the ...
VeryNiceArgumentException's user avatar
0 votes
1 answer
765 views

How do I write directly to video memory without xorg?

Kind of an odd question I know, but fifteen years ago I was able to use svgalib on some ancient version of Debian to draw directly to video memory without xorg. To my dismay I see svgalib was pulled ...
cat pants's user avatar
  • 487
1 vote
0 answers
97 views

Frame buffer driver(altfb) not working with a 24 bit display

I am developing an embedded Linux system with a 24 bit LCD display. I use terasic linux-socfpga to compile the kernel and I want to use the altfb driver to show the desktop in LCD. For that, I copied ...
Arun Kumar K S's user avatar
0 votes
0 answers
413 views

Low-Latency method to read Xorg or DRM framebuffer

I am trying to build an application that can measure the latency/processing time of graphics frameworks on Linux. My idea is to implement simple programs that react to an input event (e.g. mouse click)...
Andreas Schmid's user avatar
2 votes
1 answer
650 views

Got EOS from element "pipeline0" on gst fbdevsink

I'm trying to forward video file to the framebuffer on my device that has no X. I'm using gstreamer with fbdevsink plugin. When I test it with gst-launch-1.0 videotestsrc ! fbdevsink it works ...
przemoch's user avatar
  • 161
0 votes
0 answers
904 views

Alpine Linux: Disable switching into framebuffer mode at boot?

We are installing a custom version of Alpine Linux on several embedded elderly PC. The monitor is connected using VGA and may not report the supported resolutions correctly, hence the GPU may choose ...
Thorbjørn Ravn Andersen's user avatar
0 votes
0 answers
256 views

qt5 program with "-platform linuxfb" does not reset framebuffer when crashing

We have a qt5 program running under Alpine Linux v3.14 which uses a fragile legacy library which may cause the entire program to crash. Alpine Linux switches to framebuffer mode during start up. We ...
Thorbjørn Ravn Andersen's user avatar
1 vote
0 answers
602 views

How to hide firmware logo in GRUB?

I disabled the hidden menu feature of GRUB on Fedora 34 Workstation, which hides GRUB menu and lets the vendor logo remain on the screen during GRUB operation. $ sudo grub2-editenv - unset ...
Roman Riabenko's user avatar
1 vote
0 answers
947 views

how to not stretch the 4:3 (1024x768) resolution on a wide monitor (1920x1080)?

I need this because my dell notebook video card is only not freezing if I use nomodeset on grub. But then, I am limited to 4:3 resolutions (right?). So, I am looking for a way to not stretch the ...
Aquarius Power's user avatar
1 vote
0 answers
4k views

Is it possible to configure GRUB to remove UEFI vendor logo faster during boot?

I appreciate the flicker free boot feature of Fedora. However, I am a disappointed customer of my laptop manufacturer. I would like to see less of its logo, so that I could dwell less on my regrets. ...
Roman Riabenko's user avatar
2 votes
1 answer
1k views

Write on /dev/fb0 has no effect on GUI console

I run X in this way /usr/bin/X vt07 -retro to have the GUI on console 7 and the gray grid as background. On console 1 I write while [ 1 ] ; do cat /dev/random > /dev/fb0; done and I see the ...
Davide Martincich's user avatar
8 votes
0 answers
2k views

hwinfo --framebuffer shows nothing, can't change grub resolution

I am using a Lenovo Yoga C940 15" with Fedora 34. It has a 4K screen with an nvidia gtx1650 mobile card and integrated intel graphics. I wanted to change the resolution of the GRUB menu because ...
Nicholas Stommel's user avatar
1 vote
0 answers
186 views

Is it possible to access the "frame buffer" so I can change the properties of each pixel?

I don't know if my question is technically correct. Here is what I want to do, I'm running linux with xorg. The colors on my screen is way too dull. Its not my hardware because when I had windows my ...
User's user avatar
  • 254
2 votes
2 answers
4k views

How can I enable TTY console?

I'm running Linux (Debian 10) on a Chromebook (Eve) using a stock Chrome OS kernel (4.4.x) with minor modifications. Everything runs (mostly) fine except that TTY console cannot be accessed via Ctrl+...
seamux's user avatar
  • 148
1 vote
1 answer
3k views

Can't clear /dev/fb0

I have one of those 7" HDMI diplays from eBay, driving it with a Q1900 board running Ubuntu 20. I can write to the display using fbi: sudo fbi -a -T 1 --noverbose -d /dev/fb0 -t 5 --blend 1000 &...
Robert Murphy's user avatar
9 votes
5 answers
24k views

cannot run in framebuffer mode. Please specify busIDs

from my previous question empty screen after booting from live persistent usb, I am able after boot to access all files and folders, but the X-server is unable to load (so I get only to tty1). From ...
milanHrabos's user avatar
1 vote
0 answers
28 views

Is it possible to run fb on one head and X on anohter, given one card connected to a TV and a monitor?

I would like to set up so that my computer's monitor is connected to it's VGA output, while having a framebuffer on the other head. Both heads seem to share a card. They work fine as part of the same ...
Nobody Tells The Truth's user avatar
2 votes
0 answers
704 views

Initializing framebuffer device without udev

I am trying to reduce boot time in a Raspberry Pi 4 using Yocto Linux. The system uses SysV init. There is psplash that uses framebuffer, and Qt application that uses DRM/eglfs, displayed ...
mozcelikors's user avatar
1 vote
0 answers
130 views

X writing top of screen to random parts of framebuffer - Xorg problem?

I have an ASUS laptop with an SIS graphics card. The default Xorg generated when I installed Debian (well, technically Raspbian Desktop) was at 640x480, yet it can easily do better as it's a 1280x800 ...
DHeadshot's user avatar
1 vote
0 answers
1k views

Cannot run in framebuffer mode. error help

I'm using ParrotSec and the system I normally used gave an error last night and I could not solve it. I start normally, then wait, but the KDE does not start and the screen remains black. I pressed ...
Mustafa Bayburt's user avatar
0 votes
0 answers
551 views

How do I allocate memory for a framebuffer loadable kernel module (linux)

I'm writing a 'fake' framebuffer device so I can use my e-reader as an external screen for my raspberry pi. The e-reader part is working fine (https://github.com/llandsmeer/inkvt), but now I want to ...
Lennart's user avatar
  • 101
0 votes
3 answers
3k views

Cannot force Debian to start in Framebuffer 640x480 resolution

In order to port an embedded project from an ARM target to Linux/x86, I have to create a Debian VM (I'm using Virtualbox right now) which starts in framebuffer mode with 640x480 resolution. I used ...
Marco Veglio's user avatar
7 votes
2 answers
7k views

Debian10: No such file or directory: /dev/dri/card0

I'm installing Debian 10 but I cannot startx nor have a GUI. I think the problem is about some driver. Here are the errors I've got in /var/log/Xorg.0.log : [drm] Failed to open DRM device for pci:...
Gian Marco Cialdi's user avatar
0 votes
3 answers
3k views

How to access and use Linux Frame Buffer without GTK?

I'd like to use /dev/fb0 or whichever other files are provided by the linux. This in a system specific way as low as possible how to read/write/interpret those device files for GUI frame-buffer non-...
Mini kute's user avatar
1 vote
1 answer
379 views

Can gstreamer fbdevsink output to Xvfb virtual framebuffer? Which device to use?

I learned recently how to use Xvfb virtual Linux framebuffer: https://www.raspberrypi.org/forums/viewtopic.php?f=66&t=261264 I want gstreamer fbdevsink output into a virtual framebuffer, but that ...
HermannSW's user avatar
1 vote
1 answer
435 views

Displaying a picture on the framebuffer while running a script created with dialog

I have setup scripts that use the dialog command. They are used to prepare embedded servers. I'd like to display a picture on a edge while a dialog script is running. The problem is, that dialog by ...
Hans Müller's user avatar
2 votes
0 answers
784 views

Xfbdev not found after including X (tinyx/kdrive) in Buildroot

I'm trying to add Xorg to an evaluation board for which I've already been provided with a working linux kernel. The evaluation board has an LCD display and I can confirm hardware & drivers are ...
Maldus's user avatar
  • 209