I have a problem. I am using elementary os on laptop ThinkPad T570. I've installed Nvidia drivers through installing cube into it. I am using 2 external display, one is connected via VGA cable into my dock station and another one is connected via mini display port in a monitor to display port in my dock station. First I thought it was drivers since I was using Nouveau, but yesterday I installed Nvidia as I mentioned and the result is same. However, when I lock screen, all displays are up and running and showing. When I unlock first thing which bothers me it took like 20sec of blinking black to turned off the display to show actual screen. And in 9/10 cases one of the screens stays black ( normally one in display mini port ), when I get lucky all 3 display shows up and works perfectly fine.
As I mentioned I search online for a solution but what I found was drivers, I managed to install cube from Nvidia. Which should work fine. Still a bit newby into Linux. So if you need any additional pieces of information, just say will provide it.
Greetings,
Marko.
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Despite days of research, I can't seem to find a reliable way to programmatically create GL[ES] contexts on secondary GPUs. On my laptop, for example, I have the Intel GPU driving the panel, and a secondary NVIDIA card not connected to anything. optirun and primusrun let me run on the NVIDIA card, but then I can't detect the Intel GPU. I also don't want to require changing xorg.conf to add a dummy display.
I have tried a number of extensions, but none seem to work correctly:
glXEnumerateVideoDevicesNV returns 0 devices.
eglQueryDevicesEXT returns 0 devices.
eglGetPlatformDisplay only works with the main panel and gives me an Intel context
I am fine getting my hands dirty, e.g. rolling my own loader, but I can't seem to find any documentation for where to start. I've looked at the source for optirun but it just seems to do redirection. Obviously something equivalent to Windows' IDXGIFactory::EnumAdapters would be ideal, but I'm fine with anything that works without additional system configuration.
First I dont know wheather this is right place to ask such question.
My laptop displays multiple screen on booting. I googled about this but I am unable to find the solution. came across this type of dysfunction on many laptops screen.
I cant figure out whether it is a screen problem/ hardware problem/ graphic card problem or its a bios problem.
I would really appreciate if anyone can direct me towards correct solution.
Following steps will help zero down
Enter Safe mode ( F8 in most ) and then see if its there. If it's gone then there's a problem likely with the graphics driver
Try to download the latest Chipset drivers from Intel or AMD Site depending on your Graphics card. Intel has a chipset detect utility that will pull up the latest drivers for all intel h/w on the pc
If you see this just on the desktop ( and not other apps like browser ) - it because the desktop background image is tiled vs Centered / stretched. In that case change it to centered.
Uninstall graphics driver and see if the multiple images disappear. You will not see high res image without driver but it will rule out card failure vs improper driver
This is a fairly broad question, so I will try to keep it as focused as I can.
I currently own a Lenovo laptop with Ubuntu installed and touchscreen functionality and own a pressure-sensitive Bluetooth pen, and been trying to make the two work together as a cheap Cintiq-like tablet.
The pen has, unfortunately, support for only specific apps for iOS phones and tablets.
So after lots of research, I've managed to interface with the pen and create a uinput device for it, so I can register button clicks and pressure changes on the pen and even see them routed to GIMP when configuring the device through the Input Controllers menu.
The code I have so far for that interface is available here.
The trouble starts when trying to test it out with GIMP.
From what I gather, this is because GIMP assumes Wacom devices report their own position, treats touchscreen touches as mouse movements and only allows input from a single device at a time.
My question is, how can I work around this?
More specifically, how can I create a uinput device that would behave as a Wacom tablet and supersede/block the behavior I described?
Or if there's a different solution, such as patching GIMP or writing a plugin for it.
Update (2014-06-07)
The code mentioned above now works.
I have written a blog post on the process of getting this to work: http://gerev.github.io/laptop-cintiq
As you said, Gimp expects you to provide ABS_X and ABS_Y along with ABS_PRESSURE in your driver - which is not strange, because you are using you virtual device as input, so it wouldn't make much sense to pick ABS_X and ABS_Y coordinates from one device and ABS_PRESSURE from another (although they will always be the same in this case). Maybe you can just read the current coordinates of the mouse and copy them as your own device coordinates.
As an example, the project GfxTablet does something similar to what you are trying, they have an Android application for tablets with pen and use uinput to create virtual device that works like pressure-sensitive pen on Linux. I have used it and it worked like a charm in Gimp and mypaint on my laptop, and I had no problem with having a mouse (or the touchpad) active at the same time as the uinput device (I think that Krita added support for generic pressure-sensitive devices recently). You can take a look at the source code of the driver here (surprinsingly simple, to be fair).
Note that this is not a faulty behavior of Gimp, because this is what is expected from a tablet-like device. Take a look at the event codes kernel documentation page, in the last section (Guidelines), it is said that tablets must report ABS_X and ABS_Y. Moreover, they should use BTN_STYLUS and BTN_STYLUS2 to report the tool buttons and some BTN_TOOL_* (e.g. BTN_TOOL_PEN) to report activity (you can find all the available codes in input.h); however, these last does not seem that important, as GfxTablet does not implement them and worked without problem.
First off, sorry for my english, it is not very good.
I have a Toshiba satellite c885d running windows 8.1. I have a lexar 4 gigabyte usb flashdrive. It says on the back: LJDS50-4GB. I used Linuxlive usb creator and backtrack 5 r3 gnome 32 bit. I downloaded the ISO from backtrack-linux.org.
When I put my usb into my computer, hold f12, and power it on, it takes me to the boot menu, where it gives me 4 options to boot from. after each one, there is a little bit of text. except after "usb" is blank. and then at the bottom is two more options, one taking you to the menu that you can also access by pressing f2 durring startup.
If I hit enter when usb is selected, it takes me to a black screen that says two words (something like checking usb, but I forgot. I will put in an edit that will contain a picture and the exact text.) then after 2 seconds, it says failed, and then launches windows. PLEASE PLEASE PLEASE help me out. I tried researching a solution to the problem, none of which worked. I have successfully run backtrack from the VM thingy that linuxlive has with all of the usb stuff, and It works fine, but it is really slow, as I have too many windows processes running at the same time. If anyone can diagnose me with a problem, awesome. If you can give me a solution, stupendous.
edit: it says "checking media" and then "failed"
images:
Ok, after some discussion in question comments I suspect that the problem is in your install image. If you can't see GRUB menu then you are unable to enter bootloader on your USB drive. It might be several things causing your problem with common denominator - UEFI:
You have written your install image incorrectly and UEFI is not recognizing it.
You have written your install image correctly, but that image is not capable to run on UEFI - see discussion here.
Anyway 100% way to make Backtrack like most of current Linux distros to work on UEFI is to turn UEFI to legacy mode (BIOS), though you have to unninstall Windows 8 ;-)
I would not give lot of hopes to that because Backtrack 5 is based on Ubuntu 10.04 which is way too old - earliest Ubuntu supporting UEFI is 12.04.
I can recommend a few things that might help:
Erase your usb flash drive and write Backtrack image to it again, but with UnetBootIn. There is an official tutorial for that.
Do not try to install Backtrack 5 if don't know what GRUB is. You can install latest Ubuntu that can run on UEFI with SecureBoot (not sure it's easy) and enjoy all of the tools from Backtrack repositories.
Good Luck and have a lot of fun!
I figured it out, just had to follow the tutorial from this page: https://askubuntu.com/questions/221835/installing-ubuntu-on-a-pre-installed-windows-8-64-bit-system-uefi-supported
I want to output my console application to multiple outputs, or be able to select an output. Is this possible from consoleline? The idea is run a fullscreen SDL app using the VESA driver.
SDL has a VESA output mode (vgl), I've read, so it can be started from terminal (if I'm correct) and from console (without X11).
http://arstechnica.com/civis/viewtopic.php?f=16&t=702038
I could not find a non X11 solution for this.
I just found out Vesa does not support multiple screen output at all.
Edit: Although I've found some sources where it is stated some graphics cards support tv-out for VESA. Is there a compatibility list for this???? One would think VESA output to external monitors is pretty critical for laptops (having broken screens, etc.)..