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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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)...
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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 ...
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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 ...
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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 ...
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