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• No windows whatsoever after compiz reset

  - by Shashank Singh

  Currently using 12.04. This time I was trying to use the application switcher, and it asked me to resolve a few conflicts most of which were not easy to comprehend. So after some yes and no dialogue boxes leading me nowhere, I thought a reset should set things fine. However, after preferences-reset to default, I can't see any window!! NONE whatsoever except the log out one when I press ctrl+alt+del All I can see is the wallpaper and the mouse pointer. I cant even see the terminal or anything when I press alt+f2. I am posting this when I switch to ubuntu 2d (I cant make out the difference between the two, but this just works for now almost the same way)

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• Optimal Database design regarding functionality of letting user share posts by other users

  - by codecool

  I want to implement functionality which let user share posts by other users similar to what Facebook and Google+ share button and twitter retweet. There are 2 choices: 1) I create duplicate copy of the post and have a column which keeps track of the original post id and makes clear this is a shared post. 2) I have a separate table shared post where I save the post id which is a foreign key to post id in post table. Talking in terms of programming basically I keep pointer to the original post in a separate table and when need to get post posted by user and also shared ones I do a left join on post and shared post table Post(post_id(PK), post_content, posted_by) SharedPost(post_id(FK to Post.post_id), sharing_user, sharedfrom(in case someone shares from non owners profile)) I am in favour of second choice but wanted to know the advice of experts out there? One thing more posts on my webapp will be more on the lines of facebook size not tweet size.

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• My laptop hangs a lot

  - by Salahuddin

  My laptop is 1G ram and 120G hard-disk 1.68HZ processor , I've both Ubuntu and Windows7 on my machine For the last few days, my laptop, running Ubuntu 11.10 has been hanging a lot. A lot of the time, the touchpad won't work for unknown reasons, and I have to connect a USB mouse to be able to move the pointer on the screen. When browsing the web, the browser hangs a lot, and I have to restart the laptop to refresh it. I know that there is a hotkey to force Ubuntu to refresh when it hangs, but it doesn't work here.These problems happens only on ubuntu not on windows 7... How do I make Ubuntu light and fast? Help me, please.

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• How can I make the text cursor in X Windows easier to see?

  - by skyblue

  The text cursor in X Windows is too thin for me to see easily. It would be great if I could make the text cursor wider so that it was more visible. I know how to change the size of the mouse cursor in X by going to System Preferences Appearance and customizing the Pointer so that it is larger. But I have not been able to find any setting that allows me to alter the appearance of the text cursor. So how can I make the text cursor easier to see?

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• Functions returning pointers

  - by fg nu

  C++ noob here. I have a very basic question about a construct I found in the C++ book I am reading. // class declaration class CStr { char sData[256]; public: char* get(void); }; // implementation of the function char* CStr::get(void) { return sData; } So the Cstr::get function is obviously meant to return a character pointer, but the function is passing what looks like the value (return sData). Does C++ know to return the address of the returned object? My guess would have been that the function definition would be return &sData.

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• How do I stop that launcher from popping up when mouse goes to the left edge?

  - by Michael

  This is what it says on the help.ubuntu.com website, but when i go to system settings, it does not have a Launcher & Menus option. I wish I could revert back to the old Ubuntu, I hate this launcher. Does any know a fix plz? "Stop the launcher from showing when I point to the left side of the screen The launcher unhides when you move your mouse or touchpad pointer to the left side of the screen. If you prefer, you can tell Unity to only show the launcher when you click the top left Ubuntu button instead. Click the icon at the very right of the top bar and select System Settings. In the Personal section, click Launcher & Menus. Choose Touches the top left corner of the screen"

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• OpenGL Vertex Attributes - Normalisation

  - by Daniel

  Alas, I have searched, and have found no definitive answer. When would you normalize the vertex data in OpenGL using the following command: glVertexAttribPointer(index, size, type, normalize, stride, pointer); I.e when would normalize == GL_TRUE; what situations, and why would you choose to let the GPU do the calculations instead of preprocessing it? All examples I have ever seen, have this set to GL_FALSE; and I cannot personally see a use for it. But Khronos aren't stupid, so it must be there for something useful (and probably common).

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• Store and create game objects at positions along terrain

  - by Alex

  I have a circular character that rolls down terrain like that shown in the picture below. The terrain is created from an array holding 1000 points. The ground is drawn one screen width infront and one screen width behind. So as the character moves, edges are created infront and edges are removed behind. My problem is, I want to create box2d bodies at certain locations along the path and need a way to store these creator methods or objects. I need some way to store a position at which they are created and some pointer to a function to create them, once the character is in range. I guess this would be an array of some sort that is checked each time the ground is updated and then if in range, the function is executed and removed from the array. But I'm not sure if its even possible to store pointers to functions with parameters included... any help is much appreciated!

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• Single responsibility principle - am I overusing it?

  - by Tarun

  For reference - http://en.wikipedia.org/wiki/Single_responsibility_principle I have a test scenario where in one module of application is responsible for creating ledger entries. There are three basic tasks which could be carried out - View existing ledger entries in table format. Create new ledger entry using create button. Click on a ledger entry in the table (mentioned in first pointer) and view its details in next page. You could nullify a ledger entry in this page. (There are couple more operation/validations in each page but fore sake of brevity I will limit it to these) So I decided to create three different classes - LedgerLandingPage CreateNewLedgerEntryPage ViewLedgerEntryPage These classes offer the services which could be carried out in those pages and Selenium tests use these classes to bring application to a state where I could make certain assertion. When I was having it reviewed with on of my colleague then he was over whelmed and asked me to make one single class for all. Though I yet feel my design is much clean I am doubtful if I am overusing Single Responsibility principle

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• keyboard shortcut to switch focus between separate X screens?

  - by ang mo

  I'm using XFCE on a dual monitor setup, with Xorg configured to separate X screens (neither twinview nor cinerama is working on GF470 with latest nvidia drivers). I'm not using xrandr. Suppose I have firefox running on one screen (:0.0) and thunderbird on the other (:0.1). When I want to switch focus from thunderbird to firefox, I need to move my mouse pointer to the firefox window and click (alt-tab switches between windows on a single screen only). Is there any keyboard shortcut for switching focus between screens?

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• 13.04 - Extenal monitor plugged on laptop HDMI shows image but lags a lot

  - by Thiago Fassina

  It uses an Nvidia GeForce GTS 250M. When I plug in the monitor, it shows some images but with bad FPS and lagging a lot. For example, when I move the mouse pointer, it leaves a trail that vanishes from time to time. I didn't install Nvidia drivers because every time I did this on past versions I ended up with an unbootable system. On past versions I just gave up trying to use the monitor cause it never showed anything regardless of what driver I installed. But since 13.04 ALMOST made it, I'll make another tries. ps.: Works perfectlty on Windows 7/8

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• Game maps with "counties" that are split along lines that aren't necessarily straight

  - by pm_2

  I want to create a game environment that supports a 2D map. This is a really basic map, but must be split along lines that are not necessarily straight. So imagine a country with county boundaries. I then want to be able to detect drag / drop events within these counties. What I'm really looking for here is a pointer to where to start on this (how it has been done before - any existing libraries out there), as I'm sure that what I'm trying to do is not new - although I can't find a beginners guide for this anywhere.

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• Gnome 3 - Old fashioned buttons and menus

  - by vigs1990

  I've upgraded to Gnome 3 and the problem I'm facing is that when I restart, sometimes the menus and buttons look old-fashioned like this: whereas sometimes, it looks modern and neat like this: Notice the differences between the two: here are a few differences: The menu bar (notice the difference in fonts, dark grey color of Snapshot1 vs the light grey color in Snapshot2 in the background) The file navigation bar bellow the menu bar (notice the 'Home' button there and also the left arrow button) The left-hand side navigation bar (font, background color and color of selected folder) The old style look effects the GTK aspects of the interface, such as the menu, buttons, mouse pointer etc. Another observation is that changing the GTK themes does using gnome-tweak-tool when the old style look is loaded does NOT work. However, this works when the regular look is loaded. How can I ensure that the old-fashioned look does not load on boot?

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• Using "prevent execution of method" flags

  - by tpaksu

  First of all I want to point out my concern with some pseudocode (I think you'll understand better) Assume you have a global debug flag, or class variable named "debug", class a : var debug = FALSE and you use it to enable debug methods. There are two types of usage it as I know: first in a method : method a : if debug then call method b; method b : second in the method itself: method a : call method b; method b : if not debug exit And I want to know, is there any File IO or stack pointer wise difference between these two approaches. Which usage is better, safer and why?

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• What does Visual studio debugger do, when condition should give error

  - by zacharmarz

  I'm debugging some code and I need to break everytime, when character in string (const char *) is equal to something. So I put there breakpoint and attach condition like: s[0] == 'e'. But code I'm debugging is in CRT and there is possibility, that s == 0 is true. So "addressing empty pointer" should give some kind of error. Yes - I could give there condition s != 0, but it would not be such fun :) And I'm curious, what will debugger do when trying to evaluate this condition? How it will behave internally? Obviously it's not giving any error nor stopping on this breakpoint when s == 0 Thanks for your answer.

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• How do I increase the touchpad sensitivity on Acer Aspire One 532h?

  - by Yossi Farjoun

  I got a cheap netbook and put ubuntu on it without even booting into the windows it came with. I am now slightly regretting it since the trackpad is very annoying, it only registers when I press quite hard on it, and even then the motion is so slow that I must drag me poor finger 3 times to get the pointer to move up or down that tiny screen. OK. enough rant. now business: I went into the setting and increase sensitivity and acceleration to high. No difference. the behaviour did not change at all. So now my questions are: Is this a hardware problem? Is there a program I can run to see what input the trackpad is receiving? so I know if it can, in theory, read the light touch and not only the heavy, sandpaper-your-fingertips-off touch? is there some manual setting that the system might not be setting correctly and which I could change from the terminal?

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• Scan-Line Z-Buffering Dilemma

  - by Belgin

  I have a set of vertices in 3D space, and for each I retain the following information: Its 3D coordinates (x, y, z). A list of pointers to some of the other vertices with which it's connected by edges. Right now, I'm doing perspective projection with the projecting plane being XY and the eye placed somewhere at (0, 0, d), with d < 0. By doing Z-Buffering, I need to find the depth of the point of a polygon (they're all planar) which corresponds to a certain pixel on the screen so I can hide the surfaces that are not visible. My questions are the following: How do I determine to which polygon does a pixel belong to so I could use the formula of the plane which contains the polygon to find the Z-coordinate? Are my data structures correct? Do I need to store something else entirely in order for this to work? I'm just projecting the vertices onto the projection plane and joining them with lines based on the pointer lists.

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• Animations not accepted in animator

  - by Lautaro

  In the official Unity Animator State Machine tutorial video animation clips are dragged out from the assets folder into the animator and dropped. I have a 3D model that i bought online to experiment with that comes with animations. I added a custom made animation as well. These all work well in my demo project. But when i add a animator to the assets and try to drag and drop animations onto it it doesnt work. I get a forbidden-sign as a mouse pointer. I try to add animations through the inspector but that does not work either. The tutorials makes it seem so easy and does not talk anything about what animations can be used. What am i doing wrong?

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• Hidden Launch Bar wouldn't slide-out when moused over, now it won't hide away.

  - by Dave Keller

  When the launch bar is hidden, I have trouble getting it to slide out when I move the mouse pointer to the left side. After adjusting the settings under Settings--Appearance--Behavior, the bar no longer hides when a browser is open. Is there a fix for this. This all happened when I was looking for a way to change the icon sizes in the launch bar. Documentation from Linux.com told me to do it under Settings--Appearance, but there was no way to do it. Any help is appreciated! Thanks.

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• How to get numpad out of "mouse emulation" mode?

  - by Jonik

  My numeric keypad has somehow got into a "mouse emulation" mode where the number keys just move the mouse pointer around (2 = down; 8 = up, 6 = right, etc). Anyone know how to make it work normally again? None of the other numpad keys work either (I first noticed the whole thing when Ctrl + ÷ (numpad division sign) no longer produced "line comment" in IntelliJ IDEA). Toggling num lock doesn't affect this (though the indicator LED works as usual). I'm using GNOME on Lucid Lynx (10.4).

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• Resuming from hibernation shows a fuzzy "static" screen

  - by Ross

  When I resume from hibernation in Ubuntu 10.10 the screen shows static, very similar to what you see on an analogue TV that hasn't been tuned properly. This also occurs on boot from shut down, but only for a moment after the Plymouth boot screen. The static lasts for at least 5 minutes. An odd thing that happens is that the mouse pointer, as a lighter square of static, becomes visible and you can move it around. Attempting to change into a terminal (i.e. Ctrl+Alt+F1) doesn't seem to work (and I'm not sure if that can be done from the login screen). Resuming from suspend has different issues - vertical lines appearing for a second before appearing to be in terminal mode (blinking cursor) and then going to the lock screen. I'm running Ubuntu 10.10 on a Dell Studio 15 with ATI graphics, however I'm not using the proprietary drivers as I had issues with dual-screen support, so it's the generic X.org drivers being used.

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• 12.04 LTS won't install from CD

  - by Rob Hays

  I've been trying to install 12.04 LTS onto a Dell with a PIII from CD. Booting from the CD the install gets through the "Who are you" process, begins copying files. The progress bar gets as far as the last period in "Copying files...". The box clears, and an error box comes up "The installer has encountered an unrecoverable error. A desktop session will now be run so that you may investigae the problem or try installing again." When I try to install from this desktop session, the install gets to the same point, the copying files box closes, and then just stops. The pointer is busy, the cd drive spins up occaisonally with no data transfer, no hard drive activity. When I boot from the CD and access the disk boot menu, the disk checks good, memory checks good ( I upgraded the original memory to 512 mb). I also updated the bios to the newest from Dell. This is an older L866r, but should meet the requirements.

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• Ad networks that will serve via HTTPS?

  - by Dogweather

  I've built a website with 160K page views per month that serves every page over HTTPS. The recent FireSheep news will probably increase the adoption of "HTTPS everywhere" but it's been very hard to find ad networks and affiliates that will serve their content via HTTPS. I don't want to use these because I don't want my visitors to get "broken security" notification from their browsers (and of course, relevant ads would be a leak of private information). I'm tired of spending a ton of time signing up with ad networks and affiliates only to find out down the road that they don't support HTTPS (e.g. AdSense). Can anyone suggest any options or provide a pointer to a list of these somewhere?

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• mouse and mousepad not working properly

  - by snake

  Ubuntu 12.04 LTS Samsung Q35 The mouse pad has stopped working, only the buttons work. The external mouse is also behaving very oddly, the mouse pointer works, but the button is not working properly, it has to be pressed many times or held down to select anything, and when anything that I select behaves as though the mouse is being clicked all the screen, settings will keep changing, the page will scroll, sliders will move up and down, tabs will toggle etc, so everything is unusable with the mouse, cannot even use the browser as it keeps scrolling the page up and down. I have tested the mouse on another computer, and it works fine. Please bear in mind that I am also a complete Linux novice, I installed Ubuntu on an old laptop for my kids, that is the limit of my experience.

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• Using a Higher Precision (than 8-bit unsigned integer) Buffered Image for Heightmaps in Java

  - by pl12

  I am generating a heightmap for every quad in my quadtree in openCL. The way I was creating the image is as follows: DataBufferInt dataBuffer = (DataBufferInt)img.getRaster().getDataBuffer(); int data[] = dataBuffer.getData(); //img is a bufferedimage inputImageMem = CL.clCreateImage2D( context, CL_MEM_READ_WRITE | CL_MEM_USE_HOST_PTR, new cl_image_format[]{imageFormat}, size, size, size * Sizeof.cl_uint, Pointer.to(data), null); This works ok but the major issue is that as the quads get smaller and smaller the 8-bit format of the buffered image starts to cause intolerable "stepping" issues as seen below: I was wondering if there was an alternate way I could go about doing this? Thanks for the time.

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