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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2
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0answers
966 views

How to rotate the LCD screen/framebuffer to 180 degree?

I have a custom board with a Freecale i.MX6Q SoC. I am using Linux kernel 3.03.35 and LCD is 3.5 inch RGB type display. I want to rotate my LCD screen to 180 degree. I tried a lot to pass parameters ...
1
vote
0answers
9 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
vote
0answers
10 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 ?
0
votes
0answers
11 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 ...
2
votes
1answer
569 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 ...
0
votes
0answers
27 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 ...
10
votes
2answers
14k views

Can GRUB font size be customised?

I would like to reduce the size of the font of GRUB boot loader. Is it possible and so how?
0
votes
0answers
37 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
15 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 ...
3
votes
0answers
38 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
1answer
30 views

How can I force the console to output to something other than the framebuffer?

I recently recompiled my kernel to support the vesa framebuffer for some Directfb fun but now my console outputs text very slowly. It's almost as if turning on the framebuffer caused my console to ...
2
votes
2answers
47 views

How does bash print to the screen if not with a framebuffer? [duplicate]

I noticed that a framebuffer doesn't always exist on some systems. In these cases, how does bash print to the screen (assuming it ever uses fb devices at all)? Since there's no framebuffer device, ...
5
votes
1answer
3k views

How can I add an additional framebuffer device in Linux?

I'm running a Ubuntu 12.04 LTS as a home NAS server, without X. Recently I got into tuning it to serve as a video playing media device too. It might've been easier at this point to install X, but I ...
0
votes
0answers
26 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 ...
1
vote
0answers
42 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
105 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 ...
1
vote
0answers
81 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
1answer
302 views

How to install drivers for integrated intel graphics?

I am building a minimal Debian system. I installed Debian Wheezy with the netinstall iso, and selected to install only basic system utilities, no desktop environment. The computer that is running this ...
4
votes
2answers
956 views

How to increase the speed of a text console (kernel mode setting)?

On a Fedora 17 system (i915 hardware) KMS works out of the box - and using the console (i.e. Ctrl+Alt+F2 etc.) is very framebuffer-like. To the point that scrolling through a man page or cat log-files ...
2
votes
1answer
143 views

What is the kernel frame buffer?

I was reading the "mplayer" man pages trying to play video using just the console, (I don't have or don't want to install X11). It mentions that I can use the kernel frame buffer device which is ...
1
vote
1answer
71 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?
5
votes
1answer
254 views

Specify Monitor For Linux Console

Does the kernel, framebuffer, or a framebuffer driver (uvesafb) have an option to specify the video-card output to use? The kernel only outputs to one monitor: Kernel message buffer (before and ...
0
votes
0answers
181 views

mplayer failed to play video on framebuffer device

I tried to play a video on Linux framebuffer device with mplayer like this mplayer -vo fbdev video.mp4 but it failed, mplayer saying Error opening/initializing the selected video_out (-vo) device. ...
4
votes
2answers
179 views

dual monitor with uvesafb / Intel 945GME?

I'm using uvesafb to get a simple framebuffer on a Intel 945GME embedded graphics controller. That works fine. The PC has a single combined DVI+VGA output connector and both outputs currently show ...
2
votes
0answers
589 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 ...
0
votes
0answers
164 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 ...
2
votes
0answers
128 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 ...
1
vote
1answer
879 views

Which systemd service starts text console on the framebuffer device?

I'm working with an embedded platform and need to have /dev/fb0 clear for my own use (the device accessible over serial console while the screen is used to display information, without X.). I've ...
1
vote
0answers
61 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 ...
2
votes
0answers
286 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 ...
0
votes
1answer
1k views

Is it possible to access to the framebuffer in order to put a pixel on the screen from the command line?

I am not sure if it is the only possible way, but I read that in order to put a single pixel onto the screen at a location of your choice one has to write something into a place called framebuffer. So ...
1
vote
1answer
393 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. ...
0
votes
1answer
518 views

Best practice for hiding virtual console while rendering video to framebuffer

I'm currently rendering video in Linux directly to the framebuffer using GStreamer. I was wondering how I would go about hiding the virtual console while rendering. I can stop the cursor from ...
5
votes
1answer
4k views

Rotate console on startup (Debian)

I want to rotate my console (not X Server) by 90 degrees (clockwise). The following seems to work for me: echo 1 > /sys/class/graphics/fbcon/rotate; however, I'd prefer to use a kernel option in ...
9
votes
4answers
23k views

How to use /dev/fb0 as a console from userspace, or output text to it

So I have a Palm Pre (original P100EWW) model that I enabled developer mode on, and installed a Debian Squeeze chroot. Works great. I have plans to use this for ANYTHING (bittorrent peer, web ...
7
votes
1answer
456 views

Embedded linux LCD not calibrated

I have attached a new LCD to my embedded Linux device and when I run the system I found that it is shifted to the right. (the display starts from the middle of the LCD) I found 2 frame buffer drivers ...
0
votes
1answer
43 views

Make own graphical server [closed]

I had experience to work with framebuffer and found it pretty well to make own graphical applications. But the problem is that framebuffer is too slow. My goal: 1) Make a new tty which will work for ...
1
vote
2answers
90 views

Use/Grab the only keyboard with no user logged locally

I have a raspberry pi running some software (I have the source) that needs user interaction and has a special (USB) keyboard with only 3 keys. The program runs on framebuffer (SDL) and is launched ...
5
votes
1answer
635 views

How to enable VESA framebuffer as default in NetBSD 6.1

When booting NetBSD, the old Tecra 720CDT that I have, works quite nicely in 1024x768x15 mode with vesa fb. I always have to activate VESA when booting the system: > vesa on > vesa 0x116 > ...
1
vote
1answer
394 views

tslib tools don't draw anything on the screen

Trying to calibrate touchscreen for Qt apps with tslib on ARM-device. When running ts_calibrate or ts_test, they both work (i.e. return info about touches) and ts_calibrate successfully calibrates ...
4
votes
1answer
5k views

open /dev/fb0: No such device

I installed fbi framebuffer to view images on TTY terminals (outside X). When I do: fbi image.jpg it outputs the following error: open /dev/fb0 no such device Yet when I run ls /dev/fb*, I ...
3
votes
0answers
187 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 ...
2
votes
0answers
960 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 ...
3
votes
0answers
413 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 ...
1
vote
0answers
530 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 ...
3
votes
1answer
951 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 ...
2
votes
0answers
271 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 ...
13
votes
2answers
3k views

Kernel Mode Setting vs. Framebuffer?

With KMS, the graphics drivers are moved into the kernel. Since the framebuffer was already in the kernel, I wouldn't expect this to affect framebuffer operation. Yet, I read that KMS supercedes the ...
3
votes
0answers
418 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, ...
2
votes
1answer
459 views

How can I move framebuffer or X screen relative position?

A long time ago in a galaxy far, far away I had fixed boot screen using this nice solution. Since that time I have been looking for the way to move framebuffer in virtual console slightly to the right ...