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  • how to make ext4 more reliable?

    - by amin
    hi dears as ext4 introduced more reliable than ext3 with block journals, is there any chance to suppose it 100% reliable? what if enabling block journaling on it, which is disabled by default? as friend's guide to explain my case in more detail: i have an embedded linux device, after installation keyboard and monitor is detached and it works standalone. my duty is to make sure it has reliable file-system so with errors there is no way to fsck on device. i can't force my customer to use a ups with each device to ensure no fault by power-failure. what can you offer me more than enabling block journaling? thanks in advance

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  • Logitech M515 does not work after upgrade to 12.04

    - by user877329
    After upgrading to 12.04, my Logitech M515 does not work here is some output from the terminal: lsusb Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 001 Device 003: ID 0411:002a BUFFALO INC. (formerly MelCo., Inc.) Bus 001 Device 004: ID 055d:3021 Samsung Electro-Mechanics Co. Bus 002 Device 002: ID 413c:2005 Dell Computer Corp. RT7D50 Keyboard Bus 004 Device 002: ID 0582:0074 Roland Corp. EDIROL UA-25 Bus 005 Device 002: ID 046d:c52b Logitech, Inc. Unifying Receiver dmesg | grep Logitech [ 30.470528] logitech-djreceiver 0003:046D:C52B.0004: hiddev0,hidraw1: USB HID v1.11 Device [Logitech USB Receiver] on usb-0000:00:1d.3-2/input2 The cursor does not move. Also the mouse was working in 11.10 and is working in Windows NT 5.1.2600.

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  • Issues with Dz77BH-55K Motherboard and i7 processor on 12.04

    - by Naveed
    I just built a computer with Intel's DZ77BH-55K motherboard with i7-3770 processor. On 12.04, 11.10, and 11.04 and Linux Mint 12, the computer has been really laggy. The graphics aren't working (choppy effects, bad resolution) and the keyboard and mouse inputs are even laggy and unreliable (skips keystrokes). I'm not sure what the problem is or what I can do to fix it. I tried sudo apt-get install mesa-utils but nothing changed. I've also messed around in the BIOS but no luck there either. Any ideas? Could it possibly be a hardware issue?

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  • Convert Your Workspace to Standing Height for $22

    - by Jason Fitzpatrick
    If you’d love to try out a standing workstation but you don’t want to shell out $$$ to buy or build one, this simple $22 project will raise up your workspace surface on the cheap. All you need is a LACK side table, some shelf brackets, a shelf, and some screws. The side table goes on your desk, the monitors go on the side table, and the keyboard and mouse go on the shelf (mounted to the brackets that have been positioned at the perfect height for your forearms). Hit up the link below for more pictures, tips, and a downloadable build guide. IKEA Standing Desk for $22 [via Unpluggd] How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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  • GLSL: Strange light reflections

    - by Tom
    According to this tutorial I'm trying to make a normal mapping using GLSL, but something is wrong and I can't find the solution. The output render is in this image: Image1 in this image is a plane with two triangles and each of it is different illuminated (that is bad). The plane has 6 vertices. In the upper left side of this plane are 2 identical vertices (same in the lower right). Here are some vectors same for each vertice: normal vector = 0, 1, 0 (red lines on image) tangent vector = 0, 0,-1 (green lines on image) bitangent vector = -1, 0, 0 (blue lines on image) here I have one question: The two identical vertices does need to have the same tangent and bitangent? I have tried to make other values to the tangents but the effect was still similar. Here are my shaders Vertex shader: #version 130 // Input vertex data, different for all executions of this shader. in vec3 vertexPosition_modelspace; in vec2 vertexUV; in vec3 vertexNormal_modelspace; in vec3 vertexTangent_modelspace; in vec3 vertexBitangent_modelspace; // Output data ; will be interpolated for each fragment. out vec2 UV; out vec3 Position_worldspace; out vec3 EyeDirection_cameraspace; out vec3 LightDirection_cameraspace; out vec3 LightDirection_tangentspace; out vec3 EyeDirection_tangentspace; // Values that stay constant for the whole mesh. uniform mat4 MVP; uniform mat4 V; uniform mat4 M; uniform mat3 MV3x3; uniform vec3 LightPosition_worldspace; void main(){ // Output position of the vertex, in clip space : MVP * position gl_Position = MVP * vec4(vertexPosition_modelspace,1); // Position of the vertex, in worldspace : M * position Position_worldspace = (M * vec4(vertexPosition_modelspace,1)).xyz; // Vector that goes from the vertex to the camera, in camera space. // In camera space, the camera is at the origin (0,0,0). vec3 vertexPosition_cameraspace = ( V * M * vec4(vertexPosition_modelspace,1)).xyz; EyeDirection_cameraspace = vec3(0,0,0) - vertexPosition_cameraspace; // Vector that goes from the vertex to the light, in camera space. M is ommited because it's identity. vec3 LightPosition_cameraspace = ( V * vec4(LightPosition_worldspace,1)).xyz; LightDirection_cameraspace = LightPosition_cameraspace + EyeDirection_cameraspace; // UV of the vertex. No special space for this one. UV = vertexUV; // model to camera = ModelView vec3 vertexTangent_cameraspace = MV3x3 * vertexTangent_modelspace; vec3 vertexBitangent_cameraspace = MV3x3 * vertexBitangent_modelspace; vec3 vertexNormal_cameraspace = MV3x3 * vertexNormal_modelspace; mat3 TBN = transpose(mat3( vertexTangent_cameraspace, vertexBitangent_cameraspace, vertexNormal_cameraspace )); // You can use dot products instead of building this matrix and transposing it. See References for details. LightDirection_tangentspace = TBN * LightDirection_cameraspace; EyeDirection_tangentspace = TBN * EyeDirection_cameraspace; } Fragment shader: #version 130 // Interpolated values from the vertex shaders in vec2 UV; in vec3 Position_worldspace; in vec3 EyeDirection_cameraspace; in vec3 LightDirection_cameraspace; in vec3 LightDirection_tangentspace; in vec3 EyeDirection_tangentspace; // Ouput data out vec3 color; // Values that stay constant for the whole mesh. uniform sampler2D DiffuseTextureSampler; uniform sampler2D NormalTextureSampler; uniform sampler2D SpecularTextureSampler; uniform mat4 V; uniform mat4 M; uniform mat3 MV3x3; uniform vec3 LightPosition_worldspace; void main(){ // Light emission properties // You probably want to put them as uniforms vec3 LightColor = vec3(1,1,1); float LightPower = 40.0; // Material properties vec3 MaterialDiffuseColor = texture2D( DiffuseTextureSampler, vec2(UV.x,-UV.y) ).rgb; vec3 MaterialAmbientColor = vec3(0.1,0.1,0.1) * MaterialDiffuseColor; //vec3 MaterialSpecularColor = texture2D( SpecularTextureSampler, UV ).rgb * 0.3; vec3 MaterialSpecularColor = vec3(0.5,0.5,0.5); // Local normal, in tangent space. V tex coordinate is inverted because normal map is in TGA (not in DDS) for better quality vec3 TextureNormal_tangentspace = normalize(texture2D( NormalTextureSampler, vec2(UV.x,-UV.y) ).rgb*2.0 - 1.0); // Distance to the light float distance = length( LightPosition_worldspace - Position_worldspace ); // Normal of the computed fragment, in camera space vec3 n = TextureNormal_tangentspace; // Direction of the light (from the fragment to the light) vec3 l = normalize(LightDirection_tangentspace); // Cosine of the angle between the normal and the light direction, // clamped above 0 // - light is at the vertical of the triangle -> 1 // - light is perpendicular to the triangle -> 0 // - light is behind the triangle -> 0 float cosTheta = clamp( dot( n,l ), 0,1 ); // Eye vector (towards the camera) vec3 E = normalize(EyeDirection_tangentspace); // Direction in which the triangle reflects the light vec3 R = reflect(-l,n); // Cosine of the angle between the Eye vector and the Reflect vector, // clamped to 0 // - Looking into the reflection -> 1 // - Looking elsewhere -> < 1 float cosAlpha = clamp( dot( E,R ), 0,1 ); color = // Ambient : simulates indirect lighting MaterialAmbientColor + // Diffuse : "color" of the object MaterialDiffuseColor * LightColor * LightPower * cosTheta / (distance*distance) + // Specular : reflective highlight, like a mirror MaterialSpecularColor * LightColor * LightPower * pow(cosAlpha,5) / (distance*distance); //color.xyz = E; //color.xyz = LightDirection_tangentspace; //color.xyz = EyeDirection_tangentspace; } I have replaced the original color value by EyeDirection_tangentspace vector and then I got other strange effect but I can not link the image (not eunogh reputation) Is it possible that with this shaders is something wrong, or maybe in other place in my code e.g with my matrices? SOLVED Solved... 3 days needed for changing one letter from this: glBindBuffer(GL_ARRAY_BUFFER, vbo); glVertexAttribPointer ( 4, // attribute 3, // size GL_FLOAT, // type GL_FALSE, // normalized? sizeof(VboVertex), // stride (void*)(12*sizeof(float)) // array buffer offset ); to this: glBindBuffer(GL_ARRAY_BUFFER, vbo); glVertexAttribPointer ( 4, // attribute 3, // size GL_FLOAT, // type GL_FALSE, // normalized? sizeof(VboVertex), // stride (void*)(11*sizeof(float)) // array buffer offset ); see difference? :)

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  • Hack an Old Hardcover Book into a Reading Light

    - by Jason Fitzpatrick
    If you’re looking for a clever way to conceal a reading lamp on your bedside table, this hardcover-to-book-light conversion is just the ticket. For this project you’ll be hollowing out a hardcover book and replacing the guts with a wooden frame and a strip of cool-running and efficient LED lights. You’ll need some very basic wood working and soldering skills and an afternoon or two (mostly consumed, as the author notes, by waiting for glue to dry). Check out the video below to see the full build: Hit up the link below for a full parts list and additional building tips. How To: Not Your Ordinary Book Light [Grathio via Neatorama] How To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)Learn How to Make HDR Images in Photoshop or GIMP With a Simple Trick

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  • How do I disable the "enable/disable wireless" shortcut key on my laptop?

    - by Matthew
    On my Dell Studio XPS 16, I sometimes accidentally hit this key. Wireless becomes disabled, and hitting it again does not re-enable wireless. I have to hit it an odd number of times, then restart my computer to re-enable wireless. I can't imagine a situation in which I would want to disable wireless from my keyboard. Is it possible just disable the key all-together, so I can avoid this problem? On a related note, what package do I file the bug against? I'm happy just disabling the key, but that's really just a workaround.

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  • Where is the UIM notification area icon in Unity?

    - by James
    When I was using Maverick, it was possible to switch the input method from a UIM indicator applet. Now that I have upgraded to Oneiric, I can't seem to switch the input method even when I open uim-im-switcher-gtk. This is necessary for me because I need to be able to switch back and forth between English and Tibetan and the keyboard shortcuts don't seem to work until after I've changed the input method from the panel first. Is there some way to get a UIM indicator on the Unity panel? This is a major regression for me and makes it impossible to do certain kinds of work in Ubuntu.

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  • WUBI install not completing on Dell Latitude D600 using 10.04 and 10.10

    - by Dennis
    While trying to install a dual boot from LiveCD, WUBI seems to go through all the steps correctly. It unpacks everything, reboots, starts to finalize the install, brings up the install slide show and seems to do everything necessary. The slide show disappears and what is left is what would normally be the background, however there is no login, no panels, no response to any input or keystrokes. Using 10.04 I had a mouse cursor (working) with 10.10, not even that. In 10.04 The only way to reboot is to shutdown using the power switch. When it reboots it goes through the "finalizing install" phase again. In 10.10 if I hit the power switch it brings up a shutdown menu that doesn't respond to the keyboard, but does shutdown when the 60 seconds expire.

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  • What steps/tools/apps are necessary to make local php development on a tablet viable?

    - by Tchalvak
    I do my php web development locally, as in, creating a local instance of a site and then coding it and then pushing code to servers via git/github. I'm considering getting an android tablet or ipad and a wireless keyboard for very mobile development, but I in no way want to go back to the bad old days of using ftp and syncing up code changes on a development server directly, that would be too much of a trade-off to interest me. Is there enough support for the stack to develop php websites locally on a tablet? Anyone had experience trying this sort of thing?

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  • Wow, no words enough for my disappointment

    - by Kevin Shyr
    Really cannot describe the disappointment felt at this moment.  A month ago there was rumor out there saying Surface tablet will be around $200.  Even though everybody agreed at the time that's not possible, or fair to Microsoft partners, the expectation was set.According to Paul Thurrott (http://www.winsupersite.com/article/windows8/microsoft-surface-pricing-availability-144526), the tablet starts at $499, but without the keyboard cover (Seriously, this is like offering Lincoln with manual shift).  The more disappointed fact is that there is no version that comes with cellular capability.  I was debating whether to get one, but now that decision is very easy.I'll wait.

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  • How To Extract Individual Files From a Windows 7 System Image Backup

    - by Chris Hoffman
    Windows 7’s backup control panel has the ability to create full system image backups. While Windows says you can’t restore individual files from these backups, there’s a way to browse the contents of a system image and extract individual files. System image backups are meant for restoring an entire system. If you want to easily restore individual files, you should use another type of backup – but you don’t have to restore an entire system image to get a few important files back. HTG Explains: How Antivirus Software Works HTG Explains: Why Deleted Files Can Be Recovered and How You Can Prevent It HTG Explains: What Are the Sys Rq, Scroll Lock, and Pause/Break Keys on My Keyboard?

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  • Developing a computer system based on Nand2Tetris [on hold]

    - by Ryan
    I recently finished a book called Nand2Tetris (nand2tetris.org) where I built my own computer system from scratch with its own machine language, assembly code, and a high level language called Jack that's translated to Hack binary. However, I feel like the "computer" I built throughout the course of this book (called the Hack computer) is a bit too simple for various reasons: 1) There are only two registers (D and A), whereas most computers have much more 2) Peripheral devices like mouse and keyboard have to be directly implemented 3) Peripheral devices use a pre-planned shared memory map to communicate with the CPU instead of using interrupts (which aren't covered at all) 4) Jack (the high level language) code doesn't compile to Assembly code directly, instead it compiles to an intermediate language, which in turn gets translated to Assembly. 5) There is no ROM or permanent storage device, everything is stored in RAM 6) No support for colored monitor, networking or sound I would like to build a more complicated computer system now based on what I've learned from Nand2Tetris. Does anyone know of any good resources or books to get started on this? (BTW by computer system I mean software that can emulate the hardware of a virtual computer with its own unique instruction set)

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  • Effects of automated time tracking/monitoring [closed]

    - by user73937
    What are the effects of monitoring the developers' computer usage? (Which program they use - based on the title of the applications - and how much time in a day they use the keyboard and mouse.) Would it has any positive or negative effects on productivity, morale, motivation, etc? It will not have any direct impact on the developers' salary or their performance review it's just for curiosity. The developer and their manager will only see the results. Would it change anything if only the developer is allowed to see the results? The developer can disable the monitoring (for privacy) but it won't count as work time (in the monitoring program).

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  • Calculating WPM given a variable stream of input

    - by Jaxo
    I'm creating an application that sits in the background and records all key presses (currently this is done and working; an event is fired every keydown/keyup). I want to offer a feature for the user that will show them their WPM over the entire session the program has been running for. This would be easy if I added a "Start" and "End" button to activate a timer, but I need to detect only when the user is typing continuously - ignoring all one-time keyboard shortcuts and breaks the user takes from typing. How in the world do I approach this? Is this even realistically & accurately possible?

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  • UIM notification area icon in Unity, Oneiric?

    - by James
    When I was using Maverick, it was possible to switch the input method from a UIM indicator applet. Now that I have upgraded to Oneiric, I can't seem to switch the input method even when I open uim-im-switcher-gtk. This is necessary for me because I need to be able to switch back and forth between English and Tibetan and the keyboard shortcuts don't seem to work until after I've changed the input method from the panel first. Is there some way to get a UIM indicator on the Unity panel? This is a major regression for me and makes it impossible to do certain kinds of work in Ubuntu.

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  • Metacity used with proprietary driver and proposed repository

    - by Oxwivi
    I enabled the proposed repository in a fresh install with the proprietary nvidia-173 driver. After the reboot, I noticed that minimizing and maximizing, there were none of the expected effect (using Ubuntu Classic, even with proprietary driver, Unity does not work - another issue). Furthermore I confirmed by trying to switch workspaces using keyboard shortcuts, and the square desktop wall was replaced by horizontally lined workspaces of Metacity. Of course, the upgraded Compiz could be responsible, but I can't figure out what to do - please advice. Additionally, if it's an issue with the softwares from proposed repo, how and what do I do to notify the developers of the issue?

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  • How can I restart compiz from tty? (& Related, how can I set up a fallback WM?)

    - by Jon
    So I'm testing Natty, and Compiz keeps crashing on me. I expect this sort of thing from alpha software, of course, but it doesn't always give me the option to restart compiz, and for some reason doesn't have a fallback WM configured. Without a window manager, all my programs are still running, but they're not accepting input from the keyboard, and I can't switch between them. I can, however, press Ctrl+Alt+F1 and get a terminal, and I can killall Xorg to reset everything, but I'd rather just reset compiz if possible. If I try typing compiz --replace there in the tty, it complains "fatal--couldn't open display." Is there a way to have tty1 restart compiz? Like compiz --replace --display=something? Additionally, is there a way to configure a fallback window manager so that there's an easier way to recover from compiz crashing?

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  • Unable to install 11.10 to new OCZ Agility 3 SSD

    - by Masi
    I know the discussion here where they are not getting the same error as I. I use Lenovo Thinkpad X60. The default partition table: sd1 ext4 53.91GB, sd2 extended 1.99GB and sd5 swap 1.99GB. I get Input/output error during read on /dev/sda when trying to install from LiveCD -mode and when trying to install directly. I get the error normally at the stage of choosing time zone or very last at choosing the keyboard layout. Then there is the box with buttons: back, ignore and continue. Neither of them put the process forward so I need to cancel it. How can you install Ubuntu to SDD disk?

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  • Installing Ubuntu 12.10 on new computer with Windows 8

    - by rft183
    I recently purchased a new HP computer (P6-2330) with Windows 8. I have tried unsuccessfully to install Ubuntu 12.10 64bit alongside Windows 8. The computer is UEFI with Secure Boot enabled. I've tried following the instruction at https://help.ubuntu.com/community/UEFI. I am able to get the GRUB menu to show up. However, as soon as I press Enter on either Try Ubuntu or Install Ubuntu, the screen goes blank. Nothing works at all, not even the Num Lock or Caps Lock keys on the keyboard. I have to use the power button to restart the computer. Does anyone have any suggestions on how to get Ubuntu installed? To clarify, I have actually tried installing using both a USB stick and a DVD. The USB stick gave a blank screen, while the DVD gave the error message "Empty Security Header" after pressing Enter at the GRUB screen.

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  • Ubuntu Stuck at boot after update

    - by raphie
    I'm doing this question because I can't edit other questions and I'm trying to set up my computer with Ubuntu but I'm a total idiot about this. I want to give Ubuntu a try, I build up a system specially for Ubuntu but when everything seems to be OK I made a suggested update and now when I restart my computer Ubuntu is stuck in the purple screen. I read other questions about this but, as I said, I'm a total idiot with this and I don't understand a bit what you guys are talking about when saying reboot with Grub, press Ctrl-F4 or whatever. My keyboard shutdown when this happens and only accepts Alt-Ctrl-Del to reboot again. Ctrl-F4 is not working for me. Pleas Help Me, cure my MS insanity Pleaseee! :) Any help I will appreciate it!

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  • Gmail Now Searches Inside PDF, Word, and PowerPoint Attachments

    - by Jason Fitzpatrick
    Gmail has long had a robust system for searching within the subjects and bodies of your emails, now you can search inside select attachments–PDF, Word, and PowerPoint attachments are all searchable. Prior to this update, Gmail could search inside of HTML attachments but lacked more advanced attachment querying abilities. Now when you search your Gmail account you’ll see search results for not only the subject and body contents but also the contents of popular formats like PDF and Word documents. Don’t forget to take advantage of advanced search terms to speed up your query. If you know the information you need is in an attachment but can’t remember which email, include “has:attachment” in your search to only peek inside emails with attachments. [via GadgetBox] HTG Explains: How Antivirus Software Works HTG Explains: Why Deleted Files Can Be Recovered and How You Can Prevent It HTG Explains: What Are the Sys Rq, Scroll Lock, and Pause/Break Keys on My Keyboard?

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  • Beginner: How to Make Explorer Always Show the Full Path in Windows 8

    - by Taylor Gibb
    In older versions of Windows the Title Bar used to display your current location in the file system. In Windows 8 this is not the default behavior, however, you can enable it if you wish to. Display the Full Path in the Windows Explorer Title Bar Press the Windows + E keyboard combination to open Windows Explorer and then switch over to the View tab. On the right-hand side click on options and then select Change folder and search options from the drop-down. When the Folder Options dialog opens, switch over to the View options. Here you will need to tick the Display the full path in the title bar check box. That’s all there is to it. How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU HTG Explains: Is UPnP a Security Risk?

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  • The Best Apps and Cloud Services for Taking, Storing, and Sharing Notes

    - by Lori Kaufman
    Is your desk and computer covered with sticky notes? Do you have miscellaneous pieces of paper with bits of information buried in drawers, your laptop case, backpack, purse, etc.? Get rid of all the chaos and get organized with note-taking software and services. We’ve collected a list of the best desktop applications and cloud-based services for taking, storing, and sharing information. How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More 47 Keyboard Shortcuts That Work in All Web Browsers How To Hide Passwords in an Encrypted Drive Even the FBI Can’t Get Into

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  • thunderbird-bin causing CPU (core) lockup (12.04, 64bit, up-to-date)

    - by david6
    I have experienced 2-3 unexplained lockup over last 10 days. Today, I had a random lockup (no mouse, keyboard response, 100% CPU). But, when I finally switched (Ctrl-Alt-F1) to command line (it took several minutes) it told me that thunderbird-bin had locked a CPU. I ran this to resolve: pidof thunderbird-bin sudo kill #### However, after saving other work, I tried restarting Thunderbird. It went to 90%+ CPU, and within 20 seconds it locked again. Once I have more detail I will raise a bug (on Ubuntu Forums). Does anyone have any other suggestions, advice?

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