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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1answer
1k views

What happened to `vga=ask` in newer kernels?

I used to activate framebuffer mode in the "older" kernels with vga=ask, and later setting it to a value, once I've figured out which one works best for me. Now, this option seems to be gone, the 3....
2
votes
1answer
626 views

How to redirect and use the framebuffer?

I need to work on the framebuffer to record what is being rendered. Now, I figure out how to convert the framebuffer in an image, I'm currently unable to obtain a constant stream of data from the fb ...
1
vote
1answer
76 views

How to paint on linux graphical console?

I need to display QR codes on graphical console on Linux. I am using qemu. Can you give me a sample code of painting something on graphical console or a hint how to do that?
1
vote
1answer
436 views

change linux text console scrolling speed - without rebooting

Is there any way to change to the text console scrolling speed without rebooting? Currently using Fedora, but non-distribution-specific answers appreciated. https://www.kernel.org/doc/Documentation/...
5
votes
0answers
431 views

Setting Framebuffer splash resolution when exiting X

I installed a copy of BackTrack 5 R2 (Ubuntu 10.04) to my HDD and dual-booted with Windows 7. After a bit of tweaking I set about updating the native Intel drivers because it was only allowing me to ...
4
votes
0answers
68 views

Can I change the X rotate the xf86-video-fbdev during execution?

Below is my /etc/X11/xorg.conf.d/1-fbdev.conf. /etc/X11/xorg.conf.d/1-fbdev.conf Section "Device" Identifier "LCD" Driver "fbdev" Option "fbdev" "/dev/fb0" Option "Rotate" "UD" EndSection ...
3
votes
0answers
93 views

Why I need a framebuffer size larger then monitor size when transform destination area is smaller

I tried to remove 100px left & right the top of a 1366x768 screen (as below) using xrandr transformation. But I got an error about not enough framebuffer size. $ xrandr --output LVDS1 --fb ...
3
votes
0answers
689 views

Setting the EFI Framebuffer's Resolution during boot

I've got a MSI WD-60 laptop running Gentoo. It has one of those 3840x2160 screens so I've had to setup Gnome/Firefox/IntellJ to double their DPI for anything to be readable. It all works fine except ...
3
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0answers
212 views

Setting the video output for the framebuffer device

I'm working with Broadcom's 97356 device, which contains an HDMI and an analog video output device. I'd like to be able to draw stuff to one of those two devices (or both at the same time!) using a ...
3
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0answers
457 views

add monitor to linux tty framebuffer

Whenever I use my laptop at my desk, I usually connect it to an external display on DP-1. To switch the window manager output to this display, I can just use xrandr --output DP-1 ... However, ...
3
votes
0answers
455 views

When would I use FBDEV vs DRM vs DSS?

I'm new to Linux graphics, and I'm interested in developing a graphics driver. I see that Linux supports three methods for writing graphics to the display device FBDEV DRM DSS2 When would I use ...
2
votes
0answers
149 views

Specify Virtual Size using DRM with Frambuffer Emulation

I am attempting make use of double buffering on an AM335x processor. We have an example running on a demo image that was not created by us. I am working on putting together our own image using ...
2
votes
0answers
308 views

Why reading from and writing to framebuffer shows no effect ?

I read a very short description of how to make a Screenshot by making use of the file which represents the framebuffer /dev/fb0. in order to write the screen content: cat /dev/fb0 > file in ...
2
votes
0answers
1k views

How to create the framebuffer file node?

I'm working with a limited embedded device - Linux environment - that uses a custom DirectFB implementation to draw a user interface in its video output. I would like to exchange this method by a raw ...
2
votes
0answers
293 views

redirecting output of /dev/fb0 to /dev/fb2

I am using IMX6 Saberauto board on Linux OS. I have 2 displays primary is HDMI and secondary is LVDS. I want to run 2 applications. One QT on primary display, which I am able to do. Second ...
2
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0answers
742 views

modetest.c from libdrm tests lists no framebuffers

I wanted to play with KMS since it seems to be the preferred low-level graphics library on Linux. However, after compiling the appropriate modetest.c version (2.4.32, since that's the version of ...
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vote
0answers
20 views

How to have better transition between Splash Screen and Program in Frame buffer?

I am currently using Yocto Embedded Linux with frame buffer. When the machine is boot up, there is a splash screen. After the the splash screen, I will run rc.local to autostart my program. The ...
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0answers
40 views

Check if laptop is asleep

Does anyone know to check via SSH or bash script whether or not my laptop has "fallen asleep". For some reason whenever my laptop falls asleep my drawings (on /dev/fb0) are over ridden by the ...
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0answers
20 views

Load NVIDIA module for X and load nouveau module for framebuffer: automatically

NVIDIA driver doesn't have support for framebuffer console. I want Linux kernel to automatically load NVIDIA for X window system, and nouveau for framebuffer console. There should be a method to ...
1
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0answers
12 views

The window would like the X- represents at the same time in two frame buffers

I'm using the two frame buffer. /dev/fb0: 1024x768 (LCD) /dev/fb1: 1920x1080 (HDMI) I want to be the same content simultaneously on two frame buffer output. Is there any way ?
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vote
0answers
52 views

Is there some way of simulating a framebuffer device?

I'm starting to write a small software that I intend to run on embedded linux, and I want to draw the GUI using a framebuffer device. However, since I want to be able to test the software on my ...
1
vote
0answers
144 views

How to inform Xorg about a resolution I have already set?

I'm trying to get my Banana Pi Pro to switch between 1920x1080 and 1280x720 resolutions on an HDMI screen. Both resolutions work fine if I set them in uEnv.txt: disp.screen0_output_mode=1280x720p60 ...
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vote
0answers
99 views

Change device framebuffer to use overlay layer

I'm using atmel-hlcdc driver to control a LCD panel and an application uses the /dev/fb0 framebuffer created by the driver. The display works fine except that the panel's standard orientation is ...
1
vote
0answers
64 views

Does all applications which show graphics without an X server has to use the frame buffer device on linux?

I am using limelight embedded on my raspberry pi 2. The application streams games from your Windows PC. It is not an X application because no X server is running. So does this application has to ...
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vote
0answers
186 views

Tegra Mesa GLES without X

I am trying to setup a Tegra 3 (Toradex Apalis T30) based system that will have an OpenGL ES based user interface on a touch screen. Unfortunately the standard Linux4Tegra kernel is seriously outdated ...
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vote
0answers
583 views

Setting fbcon to use a specfic frame buffer device

I am trying to display the output from and SDL based application on to a framebuffer device /dev/fb1. Fb1 is associated with a SM750 based card. When I run my application, the output always appears ...
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vote
0answers
70 views

re-initialize the framebuffer when program crashes

I'm using SDL to display images on a monitor, without X installed. When my program ends successfully, the monitor goes back to the login prompt (as expected). But when my program crashes, the last ...
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vote
0answers
320 views

Problems when using the framebuffer device directly

I am writing a program using the framebuffer device directly and I have three problems there. 1) The only way I can set the screen resolution correct is by passing the kernel option during boot: ...
0
votes
0answers
53 views

Why does fbset -i report a different resolution?

I'm exploring the linux frame buffer, /dev/fb0, and when I run sudo fbset -i from a virtual console in Gnome 3 (using Terminator) on Fedora 23, it reports the dimensions of the frame buffer as ...
0
votes
0answers
49 views

How does JavaFX takes control of the Raspberry Pi?

I'm interested in doing the same as JavaFX does but using another language. I want to crate a simple interface on a system without X server installed. (I know that doing anything meaningful with it ...
0
votes
0answers
75 views

linux red-hat 7.1 + increase the ring buffer

My target is to increase the ring buffer ( I have Linux red-hat 7.1 ) , but I get the following: ethtool -G eth1 rx 8192 Cannot set device ring parameters: Invalid argument so how to enable this ...
0
votes
0answers
33 views

Attach framebuffer console(yaft) to existing tty(of own script)

I currently try to fiddle around with my android init ramdisk. One problem I'm currently trying to debug is that ADB in my new init won't start. The script works fine otherwise though, I used fbsplash ...
0
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0answers
34 views

how to show messages along with the boot logo

I am looking for a way to show some custome messages just beside the penguin boot logo , I tried to use fbcon_putc to print something just after the fb_show_logo() in the drivers/video/console/...
0
votes
0answers
3k views

How can I enable framebuffer in Debian

How can I enable framebuffer in Debian console? This is what I've already tried: Add the following lines to the "/etc/default/grub" file: GRUB_GFXMODE=1024x768 GRUB_GFXPAYLOAD_LINUX=1024x768 ...