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• How do I know if my system is capable of playing 24bit/96kHz sound?

  - by Igor Zinov'yev

  Let me state for the record that I'm a total noob when it comes to Hi-Fi sound systems, but I am rather picky about the sound quality. Normally I listen to CD recordings ripped to FLAC in 16/44, but I have several albums that are also ripped from vinyls to FLAC in 24/96. But it seems that I can't tell the difference between 16-bit and 24-bit versions (except for some vinyl noises, of course). That can be due to several reasons: my equipment (onboard audio, monitor headphones) isn't good enough to make any difference, my system is not playing audio in 24-bit 96 kHz, I am physically unable to hear the difference. So here is my question, how do I tell if my system can play 24-bit sound with 96 or 192 kHz resolution? And if it can, how do I tell that it plays it instead of downsampling to 16-bit / 44 kHz? Also, what hardware (audio cards, amplifiers, etc.) would you recommend to play such recordings on Ubuntu?

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• Time Passes

  - by Robert May

  It’s been half a year since my last post.  My how time flies.  My new years resolution is to post more frequently.  After a short stint at a local company, which shall remain nameless, I’m back at Veracity.  Overall, Veracity Solutions is one of the best companies I’ve worked for, and I’m relieved to be back. So, this year, I’m going to do the following on my blog: Finish the Agile posts I started (IN MAY!!!). Blog about some code for a logging helper to make debug logging easier. Blog some resharper snippets to help with logging. Blog a Unity Container helper to allow you to specify dependency mappings with attributes on interfaces. If I can accomplish all of those, I’ll have done well this year, and since I’ve put this out to the public, I’m accountable for it, right? Technorati Tags: Agile,logging

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• Problems with HP laptop

  - by Jan

  So the problem is...every time I reboot or shutdown laptop and when the laptop is booting again I get screen (before loading OS) that HP discovered overheating and system went into hibernate. But the point is that laptop is not overheating nor going into hibernate by itself. Also becouse of the hybrid graphic cards I cannot install additional drivers. Desktop resolution and all works perfectly but I cannot use unity 3D also openGL doesn't work as it should (with cairo docks) As i've read some posts, people say that switcheero doesn't work on 12.04 so I haven't tried it.

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• Star Wars: An Infographic Flowchart

  - by Jason Fitzpatrick

  If you can’t get enough of Star Wars lore, this minimalist set of infographics details major characters, conflicts, and alliances in the Star Wars universe. Courtesy of designer Marc Morera, the series of Star Wars infographics give a quick summary, presents all the major players in the movies, and connects all the players and events via flowchart. Hit up the link below to see all of them in their high-resolution glory. Star Wars Infographic [via Cool Infographics] How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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• How do engines avoid "Phase Lock" (multiple objects in same location) in a Physics Engine?

  - by C0M37

  Let me explain Phase Lock first: When two objects of non zero mass occupy the same space but have zero energy (no velocity). Do they bump forever with zero velocity resolution vectors or do they just stay locked together until an outside force interacts? In my home brewed engine, I realized that if I loaded a character into a tree and moved them, they would signal a collision and hop back to their original spot. I suppose I could fix this by implementing impulses in the event of a collision instead of just jumping back to the last spot I was in (my implementation kind of sucks). But while I make my engine more robust, I'm just curious on how most other physics engines handle this case. Do objects that start in the same spot with no movement speed just shoot out from each other in a random direction? Or do they sit there until something happens? Which option is generally the best approach?

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• Packard Bell Easynote NJ65 not saving gamma Setup.

  - by Pablo Gomez

  Hi. There seems to be a issue with the Easynote range of PB laptops. Since Ubuntu 10.10 does not use a Xorg.conf file to save your gamma / resolution /brightness setting, everytime I turn on my laptop I have to open up a terminal window and use the x-gamma command to set it up to my personal preference. Is there a way to create a configuration file which can save that into the system everytime I load up the OS? When I used to have a Compaq Presario (an F564LA with integrated nVIDIA graphics), I could save a config. file into the system which loaded up everything on startup To those who don't know the spec's for a NJ65 laptop, I'll provide them Processor: Intel® Pentium Dual Core @ 2.2 GHZ Video: Integrated Intel® GMA 4500MHD graphics HDD: 320GB SATA RAM: 2GB DDR2

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• Ubuntu does not work with Nvidia drivers, gives random squares after logging in

  - by jimbo

  I tried installing both with wubi and by booting from a usb drive. After I tried both it was the same. Ubuntu tried to login, but after a while, a weird pattern with squarely shapes appeared. At one point, after using recovery mode and then the low graphics one (i don't remember how it was called exactly) i managed to get in. It still didn't display at correct resolution, and the mouse was invisible at times. However, after rebooting once, because i tried downloading the nvidia drivers, i didn't manage to get in again, so i have the same problem... I have no idea what to try to become unstuck. The main problem is that after the login, ubuntu crashes, with a screen full of randomly coloured squares. Should I just give up?

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• Rendering Unity across multiple monitors

  - by N0xus

  At the moment I am trying to get unity to run across 2 monitors. I've done some research and know that this is, strictly, possible. There is a workaround where you basically have to fluff your window size in order to get unity to render across both monitors. What I've done is create a new custom screen resolution that takes in the width of both of my monitors, as seen in the following image, its the 3840 x 1080: How ever, when I go to run my unity game exe that size isn't available. All I get is the following: My custom size should be at the very bottom, but isn't. Is there something I haven't done, or missed, that will get unity to take in my custom screen size when it comes to running my game through its exe? Oddly enough, inside the unity editor, my custom screen size is picked up and I can have it set to that in my game window: Is there something that I have forgotten to do when I build and run the game from the file menu? Has someone ever beaten this issue before?

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• Mouse pointer size problem

  - by Rasmus Pedersen

  My mouse cursor is double the normal size. Its only the default pointer that is enlarged. Variations like resize, busy and so on are the correct size. The problem persists even when I change cursor theme. If I move the cursor inside a Firefox window it changes to the correct size. My resolution is 2560x1440, its a single screen setup. Nvidia-settings reports my DPI to be: 108x107. I've tired to force that DPI in the LightDM conf, since I figured it must have something to-do with the DPI calculation. I have tried to change the cursor size through dconf but the problem still remains. I haven't seen this problem before, it arrived after the upgrade from Beta 2 to release version of Ubuntu 11.10. Anybody got any idea what the problem might be, its pretty annoying with the huge cursor.

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• Ubuntu won't use my nvidia driver

  - by Spencer

  I'm running Ubuntu 12.10 on a laptop that has both Intel Integrated Graphics and an Nvidia Geforce 540m. I installed the drivers properly, but I can't manage to actually use them. I'm stuck in 640x480 resolution and the drivers aren't detected anywhere. Each time I open the Nvidia settings menu it says: "You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (Just run 'nvidia-xconfig' as root), and restart the X server." ^Doing so does not help. Anybody have any ideas?

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• Optimization ended up in casting an object at each method call

  - by Aybe

  I've been doing some optimization for the following piece of code : public void DrawLine(int x1, int y1, int x2, int y2, int color) { _bitmap.DrawLineBresenham(x1, y1, x2, y2, color); } After profiling it about 70% of the time spent was in getting a context for drawing and disposing it. I ended up sketching the following overload : public void DrawLine(int x1, int y1, int x2, int y2, int color, BitmapContext bitmapContext) { _bitmap.DrawLineBresenham(x1, y1, x2, y2, color, bitmapContext); } Until here no problems, all the user has to do is to pass a context and performance is really great as a context is created/disposed one time only (previously it was a thousand times per second). The next step was to make it generic in the sense it doesn't depend on a particular framework for rendering (besides .NET obvisouly). So I wrote this method : public void DrawLine(int x1, int y1, int x2, int y2, int color, IDisposable bitmapContext) { _bitmap.DrawLineBresenham(x1, y1, x2, y2, color, (BitmapContext)bitmapContext); } Now every time a line is drawn the generic context is casted, this was unexpected for me. Are there any approaches for fixing this design issue ? Note : _bitmap is a WriteableBitmap from WPF BitmapContext is from WriteableBitmapEx library DrawLineBresenham is an extension method from WriteableBitmapEx

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• Pre order Nokia Lumia 900 from AT&T for $99.99 and Walmart for $49.99

  - by Gopinath

  Nokia Lumia 900, the flagship Windows Phone OS smartphone from Nokia is available for pre-order from AT&T Stores. With a two year contract, you can grab the phone by paying $99.99 online and they are expected to ship a day or two earlier than their official launch in AT&T stores across US. Walmart in an aggressive move, is selling Nokia Lumia 900 for just $49.99 with a two year contract. So you save $50 more. Earlier in January of this year, Nokia unveiled its plans of Lumia 900 launch exclusively for American market. Nokia Lumia 900 features a 4.3 inch Clear Black display, sporting a resolution of 800 x 480 pixels, 1.4 GHz Snapdragon processor, Windows Phone 7.5 (Mango) OS, 8 megapixel rear camera with f2.2/28mm Carl Zeiss lens and dual LED flash, auto-focus and HD (720p) video recording, 1 megapixel front-facing camera for video calls, 512 MB RAM, 16 GB internal memory, 14.5 GB user memory and more. Pre-order Nokia Lumia 900 from AT&T and Walmart

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• How can I switch between fglrx and ati drivers?

  - by Santa Maradona

  Hi there, How can I switch between fglrx and ati (open source) drivers without uninstalling fglrx? The thing is I'm using FGLRX on a daily basis, because it's better for movies--OS driver displays annoying horizontal line while playing movies. FGLRX also does this, but it's less visible. That's only disadvantage of OS driver. When I want to plug in external monitor with different resolution than my laptop's LCD I have to use open source driver, because FGLRX can't display two different resolutions at the same time. I can uninstall FGLRX, but it's rather inconvenient to do this all the time. I've noticed that when I'm using FGLRX there is xorg.conf file and when I uninstall it, then the file is missing. So my question is how to switch between them? It'll be perfect if I could do this without restarting my computer either. I'm using Ubuntu 10.10, laptop/netbook MSI U250.

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• Add autorandr before kdm starts

  - by Serge Tarkovski

  I want to add autorandr before kdm starts. Autorandr works well within KDE, however, in kdm I still have ugly 1024x768 resolution when my external monitor is connected. I tried adding autorandr --change to /etc/kde4/kdm/Xsetup: #! /bin/sh # Xsetup - run as root before the login dialog appears #xconsole -geometry 480x130-0-0 -notify -verbose -fn fixed -exitOnFail -file /dev/xconsole & /sbin/initctl -q emit login-session-start DISPLAY_MANAGER=kdm /usr/local/bin/autorandr --change >> /tmp/autorandr echo "Xsetup finished" >> /tmp/xsetup-finished A debug message in /tmp/xsetup-finished appears correctly. /tmp/autorandr is empty (so it seems autorandr runs without errors). I also tried to move autorandr --change line before /sbin/initctl -q emit login-session-start DISPLAY_MANAGER=kdm with no effect. P.S. Of course, autorandr profiles I created under KDE session, are in my home folder, but Xsetup script runs under root, so I created a symlink from my ~/.autorandr to /root/.autorandr.

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• 12.04 Dual Monitor Configuration changes to "Mirrored" automatically

  - by Josef

  After installing 12.04 on my Samsung X120 Notebook (with Intel GMA 4500 internal graphics card) i have a Problem with the configuration off my 2nd monitor. Its a 22" with 1680 * 1050 Pixel connected via HDMI. I use the display configuration and set internal display=off and external display=main display. That works fine. After rebooting i still have that configuration, but after a while (often when i press a button on the keyboard), the configuration automatically changes to "Mirror Screen" and the internal display switches on. Both displays then have a bad resolution. When i do the manual display configuration again, everything is fine for the duration of that session. What could be the problem, that this display configuration gets lost / resets?

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• Narrow-phase collision detection algorithms

  - by Marian Ivanov

  There are three phases of collision detection. Broadphase: It loops between all objecs that can interact, false positives are allowed, if it would speed up the loop. Narrowphase: Determines whether they collide, and sometimes, how, no false positives Resolution: Resolves the collision. The question I'm asking is about the narrowphase. There are multiple algorithms, differing in complexity and accuracy. Hitbox intersection: This is an a-posteriori algorithm, that has the lowest complexity, but also isn't too accurate, Color intersection: Hitbox intersection for each pixel, a-posteriori, pixel-perfect, not accuratee in regards to time, higher complexity Separating axis theorem: This is used more often, accurate for triangles, however, a-posteriori, as it can't find the edge, when taking last frame in account, it's more stable Linear raycasting: A-priori algorithm, useful for semi-realistic-looking physics, finds the intersection point, even more accurate than SAT, but with more complexity Spline interpolation: A-priori, even more accurate than linear rays, even more coplexity. There are probably many more that I've forgot about. The question is, in when is it better to use SAT, when rays, when splines, and whether there is anything better.

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• What are the possible options for AI path-finding etc when the world is "partitionned"?

  - by Sebastien Diot

  If you anticipate a large persistent game world, and you don't want to end up with some game server crashing due to overload, then you have to design from the ground up a game world that is partitioned in chunks. This is in particular true if you want to run your game servers in the cloud, where each individual VM is relatively week, and memory and CPU are at a premium. I think the biggest challenge here is that the player receives all the parts around the location of the avatar, but mobs/monsters are normally located in the server itself, and can only directly access the data about the part of the world that the server own. So how can we make the AI behave realistically in that context? It can send queries to the other servers that own the neighboring parts, but that sounds rather network intensive and latency prone. It would probably be more performant for each mob AI to be spread over the neighboring parts, and proactively send the relevant info to the part that contains the actual mob atm. That would also reduce the stress in a mob crossing a border between two parts, and therefore "switching server". Have you heard of any AI design that solves those issues? Some kind of distributed AI brain? Maybe some kind of "agent" community working together through message passing?

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• How many vertices are needed to draw reasonably good-looking terrain?

  - by bobbaluba

  I have some pretty expensive code in my terrain vertex shader, and I am trying to figure out if it will still be fast enough. I haven't yet developed a level-of-detail system for my terrain rendering, but I can easily benchmark my code by just drawing mock triangles. My problem is, how do I know how many vertices to test with? Are there for example rendering engines that will tell me how many terrain vertices are currently on-screen? Or maybe it is possible to create a formula that will give me an estimate based on screen resolution?

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• Ubuntu 12.04 "Do nothing" when "lid closed" blanks out external monitor

  - by Elijah Lynn

  This is not the same as this question. I have Ubuntu 12.04 running with an Nvidia card on a W510 Thinkpad. I have one external monitor connected. When I change the power settings to "Do nothing" when "Lid closed" it still keeps the system running which is great. However, it blanks out the display on any external monitors making the system useless. I plan on getting a dock soon and having to identical resolution monitors and would love to be able to dock the monitor and work as normal on the external monitors. Does anyone have a suggestion or fix for this? Should I report this as a bug or feature request?

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• Intel HD graphics on Ubuntu

  - by tiax

  My girlfriend got a new Subnotebook for Christmas (Sony Vayo VPCY21S1E), which comes with an "Intel HD graphics" vga adaptor. When I try to boot the Ubuntu installer from USB, the screen goes blank after a short while, before I even see the Ubuntu logo. However, when I select "nomodeset" in the boot options, I can boot it to the CLI login prompt. When I start X, though, that only works in VESA mode (I've read Intel eventually got rid of Usermode Mode Setting and only offers KMS now, which I've disabled to get it to boot). What can I do to enable a) higher resolution than 1024x768 in VESA b) hardware acceleration for compiz, video playback, etc?

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• 12.10 Booting Into Variations Of Blank Screen

  - by user93954

  I've been running the Ubuntu 12.10 beta since about a month before the final release with almost no problems. However since the day of release (I'm assuming an update has caused this) I have had problems booting into the actual GUI interface. Trying to get it to work is just a case of hard shutting down until it works, but for most of the time I need to battle with various different kinds of black screens. These include a plain black screen, a flashing line and a flashing line that doesn't fit the resolution. Nine times out of ten the cursor will be displayed over these. It also sometimes manages to boot into Ubuntu, albeit text mode or sometimes it loads GRUB which it isn't setup to do. If anyone could help out with this it'd be great. I really, really don't want to have to go through yet another clean installation. Cheers.

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• MyMessageBox for Phone and Store apps

  - by Daniel Moth

  I am sharing a class I use for both my Windows Phone 8 and Windows Store app projects. Background and my requirements For my Windows Phone 7 projects two years ago I wrote an improved custom MessageBox class that preserves the well-known MessageBox interface while offering several advantages. I documented those and shared it for Windows Phone 7 here: Guide.BeginShowMessageBox wrapper. Aside: With Windows Phone 8 we can now use the async/await feature out of the box without taking a dependency on additional/separate pre-release software. As I try to share code between my existing Windows Phone 8 projects and my new Windows Store app projects, I wanted to preserve the calling code, so I decided to wrap the WinRT MessageDialog class in a custom class to present the same MessageBox interface to my codebase. BUT. The MessageDialog class has to be called with the await keyword preceding it (which as we know is viral) which means all my calling code will also have to use await. Which in turn means that I have to change my MessageBox wrapper to present the same interface to the shared codebase and be callable with await… for both Windows Phone projects and Windows Store app projects. Solution The solution is what the requirements above outlined: a single code file with a MessageBox class that you can drop in your project, regardless of whether it targets Windows Phone 8, or Windows 8 Store apps or both. Just call any of its static Show functions using await and dependent on the overload check the return type to see which button the user chose.// example from http://www.danielmoth.com/Blog/GuideBeginShowMessageBox-Wrapper.aspx if (await MyMessageBox.Show("my message", "my caption", "ok, got it", "that sucks") == MyMessageBoxResult.Button1) { // Do something Debug.WriteLine("OK"); } The class can be downloaded from the bottom of my older blog post. Comments about this post by Daniel Moth welcome at the original blog.

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• Why does my display keep turning off every 10 minutes?

  - by George Edison

  I have installed Ubuntu 11.10 (Oneiric) in VirtualBox as well as virtualbox-guest-additions . The display resolution adapts to the size of the window as expected, but the display turns off after 10 minutes of inactivity. Thinking there was some sort of power management issue at play, I went to Power in the settings dialog: There doesn't really seem to be anything there that mentions "turn off display after xxx minutes" so I assume everything is configured correctly there. Next I went to Screen and found an option there "Turn off after:". Aha! I thought. Now I have found the option - but alas: even after setting it to "never" and restarting multiple times, the display still shuts off after 10 minutes. What am I missing? What option am I overlooking?

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• I need acpi=off to boot, but this seems to disable wifi

  - by TheExp3rt

  To boot my computer, I have to use acpi=off in kernel options. Doing this apparently causes my wifi adapter to be switched off and prevents my mouse and USB keyboard to not work. If I change acpi=off to nomodeset, it fixes these problems. But then it sets my computer at a lower resolution. I am currently running Kubuntu 13.10, although none of the updates, starting from 12.04, changed the need for acpi=off. I assume I need acpi=off in because I have an oldish computer with an intel motherboard How can I boot without acpi=off? Output of uname -a: 3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 07:38:26 UTC x86_64 x86_64 x86_64 GNU/Linux

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• Graphics system failure

  - by anonymous coward

  I just upgraded two versions of Ubuntu to Oneiric after a recent set of updates broke Audacious 2.4.something in Maverick for me. When it was all finished my Asus Eee 1215N with the 1366x768 screen and the notoriously unsupported Nvidia Ion2 Optimus chipset was working on minimum compatibility fallbacks at 1024x768 resolution. So I did a little bit of reading (not enough) and tried deleting a couple parts of the graphics system to see if I could force a retry on the autodetection. The result: No graphical shell works now. Attempted so far: -reinstalling xorg/nouveau, didn't work. -installing bumblebee/nvidia-current, didn't work. -sudo dpkg-reconfigure -phigh -a, didn't work. I'd like to stress that this is otherwise a perfectly functional installation that I had spent some time setting up already (including a successful compile of Audacious 3.21 that was working with all the plugins). Is there a way for me to rebuild the graphics system from scratch or should I just give up, cry a little, backup data, wipe partition and reinstall with a USB drive?

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