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• How to achieve highly accurate car physics such as Liveforspeed?

  - by Kim Jong Woo

  Liveforspeed is a racing simulator, there is amazing amount of realistic physics. for example, tires get warm, tire actually deforms when you turn corners. You need to play this game with a mouse at the minimum because it almost drives like the real thing. Anyhow, how does one achieve that level of physics simulation? Are there off-the-shelf solutions out there? If not, how does one start with simulating real world physics as close as possible. I would love to be able to work on an opensource car physics focused game. Imagine, more passionate developers, it could keep things going.

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• Wireless icon shows grey box

  - by donald

  Hello I am running kubuntu 13.10. I had to install using the server disk and did a upgrade to the desktop version to enable full disk encryption using multiple drives. For some weird reason when I move my mouse over to the wireless icon which has an red circle and a line through it, up pops a grey box with nothing in it. This stops me from chosing which ssid's I can connect to. Ubuntu has the drive for my wirless card and it is working verified using #lspci | grep Network Centrino Wireless-N 2230 I am connected to my network from the install wizard but I need to be able to choose which networks. Please help.

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• Making an interface for input in C - How?

  - by tloszk

  I have a big question. I started to develop a simple 3D engine (or should I call it framework?). I use OpenGL for rendering and it is developed for Windows. It is all written in C. But I don't know, how to write an "interface" for the keyboard/mouse input. I would like to keep it as simple as possible and nice - what the Win32 "native" input system is not. If anyone has suggestions about the topic, please, tell me. Thanks for everyone, who answers to my question!

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• Touchpad not working on an Acer One 725

  - by big-marc

  I installed ubuntu on a usb drive on a acer one 725, and cannot seem to be able to make the touchpad work....here is what i have xinpbig-marc@Big-Marc:~$ xinput --list ? Virtual core pointer id=2 [master pointer (3)] ? ? Virtual core XTEST pointer id=4 [slave pointer (2)] ? ? Logitech USB Optical Mouse id=10 [slave pointer (2)] ? ? ETPS/2 Elantech Touchpad id=13 [slave pointer (2)] any can help me out....

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• Great Silverlight User Group meeting last night - Thanks Joel!

  - by Dave Campbell

  Last night's Silverlight User Group meeting in Phoenix went really well. We had about 15 in attendance, and everyone seemed engaged with Joel Neubeck's great Windows Phone 7 presentation. When it was over, we gave away a couple copies of Windows 7 Ultimate, one copy of the Expression Suite, an Arc Mouse, a web cam, a bunch of books, other assorted software and some TShirts.  All-in-all I think it was a good time had by all. Thanks to Joel Neubeck for the time and presentation and to Joe's mom for the babysitting! See you all next month.

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• How can I change my cursor behavior?

  - by Doug Clement

  When I am typing, my mouse cursor, if left on the text, will eventually auto-click in whatever space in the the text box I happen to be, causing me to type in the middle of a sentence. Also, the cursor in the text box will frequently stop mid-word and the screen will scroll down all of a sudden when pressing the space bar while typing. My question is, how do I change this behavior because it is driving me absolutely bat crap crazy. I have an Acer Aspire One D257 Netbook. I am not sure if it's a Xubuntu problem because it does this while I am using Windows 7 too. Any help would be nice, thanks!

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• How can I prevent [flush-8:16] and [jbd2/sdb2-8] from causing GUI unresponsiveness?

  - by ændrük

  Approximately twice a week, the entire graphical interface will lock up for about 10-20 seconds without warning while I am doing simple tasks such as browsing the web or writing a paper. When this happens, GUI elements do not respond to mouse or keyboard input, and the System Monitor applet displays 100% IOWait processor usage. Today, I finally happened to have GNOME Terminal already open when the problem started. Despite other applications such as Google Chrome, Firefox, GNOME Do, and GNOME Panel being unresponsive, the terminal was usable. I ran iotop and observed that commands named [flush-8:16] and [jbd2/sdb2-8] were alternately using 99.99% IO. What are these, and how can I prevent them from causing GUI unresponsiveness? Details $ mount | grep ^/dev /dev/sda1 on / type ext4 (rw,noatime,discard,errors=remount-ro,commit=0) /dev/sdb2 on /home type ext4 (rw,commit=0) /dev/sda is an OCZ-VERTEX2 and /dev/sdb is a WD10EARS. Here is dumpe2fs /dev/sdb2, if it's relevant.

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• Architecture of interaction modes ("paint tools") for a 3D paint program

  - by Bernhard Kausler

  We are developing a Qt-based application to navigate through and paint on a volume treated as a 3D pixel graphic. The layout of the app consists of three orthogonal slice views on which the user may paint stuff like dots, circles etc. and also erase already painted pixels. Think of a 3D Gimp or MS Paint. How would you design the the architecture for the different interaction modes (i.e. paint tools)? My idea is: use the MVC pattern have a separate controler for every interaction mode install an event filter on all three slice views to collect all incoming user interaction events (mouse, keyboard) redirect the events to the currently active interaction controler I would appreciate critical comments on that idea.

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• Bastion unexpectedly exits when I move my cursor

  - by user69358

  I downloaded the Humble Indie Bundle V, mostly because my friend told me about how great Bastion was. When I first installed it, I was getting the seemingly common "black screen" error that most people got (fixed that half with this http://ubuntuforums.org/showthread.php?p=11992661). But I also have an error where every time I move my cursor, in any direction, any amount, the game closes instantly. I can use the keyboard no problem, but without fail, every time I move my mouse, it crashes. Does anyone know what might be causing this? Has anyone encountered anything like this before? I am worried it may be a hardware issue, but hoping someone might be able to help me out. I'm running Ubuntu 12.04 on a Dell Studio 1558. Graphics card is the stock Intel graphics card, running on 4 GB of RAM.

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• Bug in firefox address bar autocomplete running on KDE

  - by marcus

  Has anyone experienced this graphical glitch when typing in Firefox address bar? The drop-down list is not drawn correctly, with some "blocks" missing. After typing more letters or hovering the mouse cursor, the list redraws itself and becomes complete. I'm running Ubuntu 12.04, Firefox 13.0.1 and this only happens in KDE (tested with 4.8.2, 4.8.3 and 4.8.4). It does not happen in Unity or Xfce with the same user profile. If I go to the KDE control panel and disable the Fade effect, the bug starts to happen to almost every menu in the system, including, the taskbar window previews. Enabling the “Fade” effect corrects the bug everywhere except in Firefox. I have an Nvidia card and I am using the proprietary driver (current, not current-updates -- not sure about the difference), but the linked question on an Arch Linux forum says this happen with the open source driver and with other cards too. Does anyone have an idea for a solution?

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• All Hail The Gu

  This afternoon I found myself kicking around in Vegas after MIX waiting for a flight to San Francisco. I was looking through the photos from MIX10 and thought it appropriate to have a little fun. Since Scott Guthrie embodied this years MIX event I thought Id turn the Gu into the poster child for the event (literally). Check it out!     The mosaic was made from the 416 photos on flickr and turned into a 2.8 GP image. You can zoom in using the mouse wheel or a single...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Why ubuntu 12.04 Operating System too slow..?

  - by Sumit Singh

  I was using ubuntu 10.10 from last year. every thing was Ok with that. recently I've installed Ubuntu 12.04 in place of 10.10, after installing that on my Dell laptop, I started to feel uncomfortable. It to slow event if you move mouse then its feel like i'll take 1min to move one place 2 another.. I know why this is happening, all because of 12.04 runs my CPU up to 99%-100% all over time. And there are 2-3 processes who use all the cpu.. like 1. System_Monitor 2. compiz I don't know why its use all the CPU even Other app can't able to run .. in Ubuntu 10.10 every think was Ok.. Any solution for this problem..!! | Thank's

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• Fade out Label / Button / Status Bar with GTK

  - by wolfv

  What is the easiest way to fade out and fade in elements in Python / GTK 3? Coming from webdevelopment, my initial take on this problem was to call c = widget.get_style_context(), c.remove_class('visible'), c.add_class('invisible') but that didn't work out (Do I have to call something like "redraw"?) I also added a transition to the GTK CSS. Thanks, Wolf EDIT: I might specify what I would like to achieve: I have this "statusbar" which is just a vertical container on my app (like in the screenshot on top of this page http://uberwriter.wolfvollprecht.de/). If the mouse is not moving, I want to fade all that stuff out (also to preserve computing power // no recalculation of word- and char count) and to minimize "distraction"). I already found the appropriate event to listen to (motion-notify-event), so now I only need to add a simple fade out and a timeout. If someone can point me to a solution, be it with clutter or cairo, I would be very happy.

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• Bastion on ubuntu 12.04 64bit black screen

  - by dm03514

  I just downloaded the Humblebundle with bastion. After installing Bastion and starting it up, only a blank screen shows the the mouse arrow. I can here the sound fine. I read a message board that recommended starting it with -windowed -x 1280 -y 720 which does not work. I am on ubuntu 12.04 64 bit, with a intel 3000 integrated graphics card. Does anyone know how I can get this to work properly? thank you.

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• Where do I have to paste an "xinput" command so that it executes it when GNOME is started?

  - by michuk

  On my Thinkpad I need to execute something like this in the terminal: xinput set-int-prop "TPPS/2 IBM TrackPoint" "Evdev Middle Button Emulation" 8 1 so that my the 2 buttons on my touchpad emulate the middle mouse click. Now I need this line to be executed each time I start GNOMe or X or whatever, so that it "just works". I tried ~/.xsession or ~/.bashrc but to no avail. Should I put it in GNOME start scripts or in /etc/X somewhere? I'm using Ubuntu 11.10.

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• kile does not get keyboard input, respond to Alt+F

  - by vishvAs vAsuki

  I use 11.10 with Unity. I use two kde apps a lot - kile and kate. Since the latest upgrade, I have observed two problems: a] I can never use Alt+F to select the file menu (works with other apps), yet when I press Alt, kile's menu comes up in the status bar. b] A few times every day, while using kile (haven't used kate as much recently), the keyboard stops responding (just in the 'editor' portion, rather than in structure-tree navigation). I cannot enter any text, but mouse works fine. I usually restart kile to continue working. One inconsistent way to reproduce it (multiple times today): I cut text from one open document using Ctrl-X switched to another document in the same kile window using Ctrl-Tab, then this happened. c] Sometimes, in kate, I can type in the editor but the keyboard won't work in the 'File open dialog'. How do I fix the above?

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• Can't connect VPN/add new VPN connection on 12.04 when using NX

  - by dbotamous

  I remote control my Ubuntu box using NX. I am trying to create a new VPN connection. I click on Configure VPN ? Add ? OpenVPN ? Create then I get a "Editing VPN connection 1" window but everything is grayed out, and I can't edit it. The only button I can click is Cancel. The reason I bring up NX is because if I plug in a monitor keyboard and mouse, I can create, edit import VPN connections just fine. So I imported all the different VPN connections, everything was fine. I then remoted back into the Ubuntu machine with NX, click on my VPN connection, and get VPN Connection Failed - The VPN CONNECTION failed to start. Not authorized to control networking. I then disconnected and reconnected NX, and now all the VPN connections I had imported are gone. Any ideas?

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• [JOGL] My program is too slow, how can I profile with Eclipse?

  - by nkint

  My simple opengl program is really toooo slow and not fluid. I'm rendering 30 sphere with simple illumination and simple materials. The only complex computing stuff I do is a collision detection between ray-mouse and spheres (that works ok and i do it only in mouseMoved) I'm not using any threads, just an animator to move spheres. How can I profile my jogl project? Or maybe (most probable...) I have some opengl instructions that I don't understand and make render particular accurate (or back face rendering that I don't need or whatever I don't know exactly I'm just entering the opengl world)

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• Trouble switching to Dvorak on Ubuntu 12.04

  - by Dodgie

  I've decided to switch to Dvorak on my Ubuntu machine, but I'm having some trouble: First, I attempted to do this through the GUI -- System Settings - Keyboard Layout - add layout (plus sign) - English(programmer Dvorak). This didn't work at first, so I restarted my machine. It seemed to work at the password prompt (if only because QWERTY did not), but I couldn't get it to accept my password. I used the virtual keyboard option to enter my password with mouse clicks (the virtual keyboard was using the programmer's Dvorak Standard) and was able to get in that way. Once logged in, however, I was back to QWERTY. Second, I tried to switch on the command prompt -- $ loadkeys /usr/lib/kbd/keytables/dvorak.map The error message I received was "Couldn't get a file descriptor referring to the console " Does anyone know what I'm doing wrong? I've looked for a solution for these problems, but couldn't find anything.

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• Video Recorder Tool (Screencast) that is up to date

  - by Luis Alvarado

  I was looking at this post How to create a screencast? which mentions some of the Video Recorders (Screencast) that I was looking for but some of them are more than 8 months old with not one single update made to them. Am looking for a Screencast that is at least update recently and that I know that if I keep using it I could count on it being updated. The most important part is video recording but sound is good too. Maybe a windows area, mouse tracking, etc.. But it needs to be up to date and not abandoned or very old. And of course that works in 11.10 and has in mind to work in 12.04.

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• Ubuntu 13.10 japanese keyboard layout intercepts Caps Lock

  - by Envek

  I've installed Ubuntu 13.10 (clean install on new machine), there are lot of changes for configuring keyboard layouts and I've tried to configure it as I've used earlier: Englis (US), Russian and Japanese (Anthy) with switching between them with Caps Lock key. (See screenshot) Caps Lock switching works fine between Russian and English and vice-versa, but with Japanese I can switch only TO Japanese (not FROM), in Japanese layout Caps Lock starting to work as usual Caps Lock (as a switch between small and BIG letters), so I need to use mouse to switch back to Ru or En layout. This happens ONLY with Japanese layouts (I've tried also simply "Japanese" and "Japanese (Kana)"), not with Chinese, Korean or anything else. I'm not sure who is blame for that, is it ibus-anthy or anything. Please help, I want to use Caps Lock to switch between all layouts. Also, I've created a bug in the LaunchPad: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1247363

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• Few specific questions on how games are developed

  - by russ

  When it comes to programming games from the old school sega games like sonic to indie games or angry birds or even to more advance games like Diablo, how exactly is level design done? As in, are the levels sometimes designed straight out of code in an IDE? Or do they create a visual level design editor where things can be placed at the click of a mouse button? I'm imagining old school games or very simple ones like indies are done via code, where extremely complicated ones require a visual editor. Is this correct? Also, when it comes to libraries like SDL or XNA, how often are these used rather than just utilizing OpenGL or DirectX? What about creating your own game engine vs utilizing one already made? Do most use already built engines? This question is directed toward the whole gaming spectrum of indie/big game development. Thanks.

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• Why does my Ubuntu freeze in the middle of something with a blank screen?

  - by mohamed

  I am facing a serious problem as my Dell Optiplex 745 loaded with Ubuntu 12.04 32bit freezes with a blank screen no mouse cursor no keyboard activity in many occasions. Sometimes when I open firefox, or software center, I really can't tell what the main problem is, but what i am certain about is it i have to do a hard reset to reboot. I tried to use a live-cd to boot but it did the same, tried the recovery console but couldn't find a way to fix from there (I am a new user) suspected a hardware problem but windows runs flawlessly so I believe its something related to ubuntu. Specs: Intel Celeron D 3.06 GHZ 3.0 GB ram Intel built in graphics Q965 1 TB HDD Bios Phoenex 2.6.4 Please help I really love ubuntu and I don't want to go back to windows!

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• System crash when trying to drag cells in LibreOffice Calc

  - by Juhele

  Some time after upgrady to Saucy I noticed several freezes and crashes when simply trying to drag content of selected cells to another place in LibreOffice Calc (version 4.1.2.3 from repository). The system stops responding - although for example Clementine still plays music from playlist - I am not able to do anything with the mouse (cursor is able to move, but no reaction on clicking). Did anybody of you also have this problem and if yes, do you have a solution? I tried to completely remove LibreOffice and install them again but did not worked for me. Currently avoiding use of drag and drop in Calc but it is stupid. Any advice would be helpful. Thanks

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• How to disable tap to click in Lubuntu 13.10

  - by radiomasten

  Tap to click is usually the first thing I disable when I have installed a new OS, but this time I couldn't get rid of it. In earlier versions of Lubuntu, I was able to disable it by writing "@synclient MaxTapTime=0" to /etc/xdg/lxsession/Lubuntu/autostart and save. But in Lubuntu 13.10 this method doesn't work any more. I can't find any solution on the internet either. (If there was a checkbox in "mouse and keyboard" preferences in LXDE to turn tap to click on/off permanently, like in Unity, that would make both lovers and haters of this divisive feature happy. I don't understand how this feature could be thought of as something everybody wants.)

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