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• Double lock screen Ubuntu 14.04

  - by Adam

  So I've got a brandynew System 76 laptop running Ubuntu 14.04, and if I close the lid, putting it to sleep, and reopen it, I am presented with the very nice new Unity lock screen. However, when I enter my password, and it succeeds, it then presents me with a second lock screen. Where I have to enter my password again, before finally being let into the desktop. Hash anyone else seen this sort of behavior?

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• Display date/time in Ubuntu lock screen (cinnamon-like)

  - by 3l4ng

  I was using Ubuntu 13.04 till a few days ago. I had installed Nemo and I guess cinnamon got installed too (I was still using Unity nonetheless). One of the good things about that was the lock screen somehow changed to mimick cinnamon's (with the background as a darkened version of desktop background and date/time displayed), something like this: I have no idea how this happened, but it looked great. It does not seem to work on Ubuntu 13.10. Anyone has any ideas to get a similar lock screen? I just need to display the date/time on one side with the bg as a darkened version of my desktop wallpaper

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• White lock screen in Gnome 3.4

  - by kedmond

  I'm using Gnome 3.4 on Ubuntu 12.04. I've noticed that my lock screen is white. If I move the mouse, click, or begin typing my password, my wallpaper appears in the background with the password prompt window, as you'd expect. But I don't think the default lock screen is supposed to just be a white screen, is it? How do I fix this? I can't seem to find anyone else with this problem and I don't know what I need to reinstall or change. Thanks!

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• Computer hobby and more?

  - by John

  I have been a fulltime student recently working on graduate work to complete a graduate degree. While continuing my studies I have maintained my computer hobby. However, recently my computer hobby has been threatening to turn into a full-fledged side business. Because I am starting to have people come to me for computer help who I have never met before (who generally heard word-of-mouth from other people whose computers I looked at) I am seriously considering putting my conditions for working on a computer into writing (for potential damage control and perhaps liability reasons). Are there any standards for this that I should reference? Should responsibility be waived for times when the computer is left in my care or any time I look at a machine? Any advice you can provide here would be appreciated. What other lessons have you learned that I should be aware of in relation to helping people while continuing my studies as a hobby? Thank you in advance.

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• pthreads: reader/writer locks, upgrading read lock to write lock

  - by ScaryAardvark

  I'm using read/write locks on Linux and I've found that trying to upgrade a read locked object to a write lock deadlocks. i.e. // acquire the read lock in thread 1. pthread_rwlock_rdlock( &lock ); // make a decision to upgrade the lock in threads 1. pthread_rwlock_wrlock( &lock ); // this deadlocks as already hold read lock. I've read the man page and it's quite specific. The calling thread may deadlock if at the time the call is made it holds the read-write lock (whether a read or write lock). What is the best way to upgrade a read lock to a write lock in these circumstances.. I don't want to introduce a race on the variable I'm protecting. Presumably I can create another mutex to encompass the releasing of the read lock and the acquiring of the write lock but then I don't really see the use of read/write locks. I might as well simply use a normal mutex. Thx

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• pthreads: reader/writer locks, upgrading read lock to write lock

  - by ScaryAardvark

  I'm using read/write locks on Linux and I've found that trying to upgrade a read locked object to a write lock deadlocks. i.e. // acquire the read lock in thread 1. pthread_rwlock_rdlock( &lock ); // make a decision to upgrade the lock in threads 1. pthread_rwlock_wrlock( &lock ); // this deadlocks as already hold read lock. I've read the man page and it's quite specific. The calling thread may deadlock if at the time the call is made it holds the read-write lock (whether a read or write lock). What is the best way to upgrade a read lock to a write lock in these circumstances.. I don't want to introduce a race on the variable I'm protecting. Presumably I can create another mutex to encompass the releasing of the read lock and the acquiring of the write lock but then I don't really see the use of read/write locks. I might as well simply use a normal mutex. Thx

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• Automatic login vs. manual login and screensaver lock

  - by Erik Johansson

  Is there a way to prevent a command from running when I login manually, but having it run when the computer starts up and GDM automatically logs me in. This is the setup: in the Gnome "on start programs" settings I have a command that locks the screen gnome-screensaver-command -l I have automatic login turned on. That means that the screen will be locked when I turn on the computer, but it will also be locked when I manually login from GDM, is there a way to prevent this?

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• Calculating up-vector to avoid gimbal lock using euler angles

  - by jessejuicer

  I wish to orbit a camera around a sphere, yet the problem is that when the camera rotates so that it is at the north pole (and pointing down) or the south pole (and pointing up) of the sphere the camera doesn't handle itself very well. It spins rapidly until arriving 180 degrees in the opposite direction. I believe this is known as gimbal lock. I understand you can avoid this problem using quaternions. But I also read in another forum that it's possible to avoid this easily using euler angles as well. Which I would prefer to do. It was said that all you need to do is "calculate a proper up-vector every frame, and that avoids the problem entirely." Well, I tried aligning the up-vector with the vertical axis of the camera whenever the camera changed orientation, but this didn't seem to work. Meaning that the up-vector followed exactly the orientation of the camera's y-axis (or it's up vector), instead of using a constant up-vector aligned to the up-vector of the world (0, 1, 0). How exactly do I go about calculating a proper up-vector as my camera orientation changes to avoid the gimbal lock problem mentioned above?

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• Why my computer working without harddisc with livecd, but with hardisk not working - computer not response to any signals?

  - by Yosef

  Hi, History of problem: I formated computer (HP Pavalion Desktop). When I restart computer - computer come to first screen before boot and not response to any signals (f2, f10, ESC, etc..) I take out motherboad battery return after time back and power computer - result : as before I disconnect wires of hard-disk and insert livecd UBUNTU to cd and power coputer: result: works without hard-disk. What is the root of problem: hard-disk broken? hard-disk wires not working well? BIOS? other reason How can I fix the problem?(Buy new hard disk etc...) Thanks, Yosef

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• SQL Server 2008 R2 still requires a trace flag for Lock Pages in Memory

  - by AaronBertrand

  Almost two years ago, I blogged that Lock Pages in Memory was finally available to Standard Edition customers (Enterprise Edition customers had long been deemed smart enough to not abuse this feature). In addition to applying a cumulative update (2005 SP3 CU4 or 2008 SP1 CU2), in order to take advantage of LPIM, you also had to enable trace flag 845. Since the trace flag isn't documented for SQL Server 2008 R2, several of us in the community assumed that it was no longer required (since it was introduced...(read more)

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• SQL Server 2008 R2 still requires a trace flag for Lock Pages in Memory

  - by AaronBertrand

  Almost two years ago, I blogged that Lock Pages in Memory was finally available to Standard Edition customers (Enterprise Edition customers had long been deemed smart enough to not abuse this feature). In addition to applying a cumulative update (2005 SP3 CU4 or 2008 SP1 CU2), in order to take advantage of LPIM, you also had to enable trace flag 845. Since the trace flag isn't documented for SQL Server 2008 R2, several of us in the community assumed that it was no longer required (since it was introduced...(read more)

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• Lock a partition to a few folders

  - by Oxwivi

  I want to have a few folders on a partition whose contents I can freely edit, but outside nothing should be saved. Specifically, I want the folders in my Home (Documents, Music, etc) on a different partition, but rest of the normally hidden folders remain in the main partition with Ubuntu. I can make the files within the Home folders save in another partition using fstab binding, but I still can't think of how to lock the partition from edits outside those folders. I'm open to suggestions of alternatives to binding - but please, no symbolic links.

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• RAID 0 performance gains?

  - by NickAldwin

  I'm building a new computer over the summer. I'm fairly competent in computer hardware, and am thus building the computer from scratch. I have everything planned out, but I was wondering about RAID. I asked which RAID I should use earlier, but now that it's pretty clear that RAID 1 isn't really that great, I think I'll go with cloud-backup instead of disk-redundancy. However, I still face a choice: use two 1TB drives as two 1TB drives, or combine them into a RAID 0 striped array. Is there any performance gain at all? I know that if one drive dies, everything is gone, so is the performance gain worth it? I'm building a pretty advanced computer, with SLI video cards and a fast CPU, so I'm thinking RAID 0 would give me some good hard drive performance. From your experience, is RAID 0 viable?

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• How do I completely self study computer science?

  - by Optimus

  Being a completely self taught programmer I would like it if I could better myself by self-learning computer science course taught to a typical CS grad. Finding different resources on internet has been easy, there is of course MIT open course ware, and there are Coursera courses from Stanford and other universities. There are numerous other open resources scattered around the Internet and some good books that are repeatedly recommended. I have been learning a lot but my study is heavily fragmented, which really bugs me, I would love If somewhere I could find a path I should follow and a stack I should limit myself to so that I can be sure about what essential parts of computer science I have studied and systematically approach those I haven't. The problem with Wikipedia is it doesn't tell you whats essential but insists on being a complete reference. MIT open course ware for Computer science and Electrical Engg. has a huge list of courses also not telling you what courses are essential and what optional as per person's interest/requirement. I found no mention of an order in which one should study different subjects. What I would love is to create a list that I can follow like this dummy one SUBJECTS DONE Introduction to Computer Science * Introduction to Algorithms * Discrete Mathematics Adv. Discrete Mathematics Data structures * Adv. Algorithms ... As you can clearly see I have little idea of what specific subjects computer science consists of. It would be hugely helpful even if some one pointed out essential courses from MIT Course ware ( + essential subjects not present at MIT OCW) in a recommended order of study. I'll list the Posts I already went through (and I didn't get what I was looking for there) Computer science curriculum for non-CS major? - top answer says it isn't worth studying cse How can a self-taught programmer learn more about Computer Science? - points to MIT OCW Studying computer science - what am I getting myself into? Overview of computer science, programming

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• Computer Science Degree or Computer Engineering Degree?

  - by Paul

  Hello everyone, I'm 23 years old living in Italy and this year I will be getting my high school diploma. I'm interested in pursuing a collage degree and work in the IT field. At the moment I'm self teaching myself Java (I also know python, html, css and mysql). I'm also learning about algorithms and OO design. I'm curious how important a college degree is for me, considering my age and if there is a big difference between computer science and computer engineer. There is a computer science university where I currently live but not a computer engineer one. For some reason universities that offer computer engineering courses are only in bigger cities such as Milan, Bologna, Roma. Cost wise, it would be cheaper for me to study near home at a computer science school. Career wise, would a computer engineering university offer me more work opportunities instead of a computer science degree ? Is it easier transiting from CS to CEN or vice-versa? I'm not exactly sure what type of job I want to pursue in the future since I'm still a bit undecided but definitely not system/network administrator, database administrator, game developer.

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• DIY Door Lock Grants Access via RFID

  - by Jason Fitzpatrick

  If you’re looking to lighten the load on your pocket and banish the jingling of keys, this RFID-key hack makes your front door keycard accessible–and even supports groups and user privileges. Steve, a DIYer and Hack A Day reader, was looking for a solution to a simple problem: he wanted to easily give his friends access to his home without having to copy lots of keys and bulk up their key rings. Since all his friends already carried a Boston public transit RFID card the least intrusive solution was to hack his front door to support RFID cards. His Arduino-based solution can store up to 50 RFID card identifiers, supports group-based access, and thanks to a little laser cutting and stain the project enclosure blends in with the Victorian styling of his home’s facade. Hit up the link below to see his code–for a closer look at the actual enclosure check out this photo gallery. RFID Front Door Lock [via Hack A Day] HTG Explains: What is DNS? How To Switch Webmail Providers Without Losing All Your Email How To Force Windows Applications to Use a Specific CPU

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• Electronic Door Lock Uses QR Codes As Keys

  - by Jason Fitzpatrick

  We’ve seen magnetic cards and RFID cards used as keys before, but QR codes? Check out the video to see how a group of Cornell University students developed a visual key card. Rather than use magnetic stripes or RFID proximity antennas, their build relies on decoding a passkey stored in a QR code–check out the above video to see it in action and hit up the link below for more information. QR Code Door Lock [via Hack A Day] 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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• Woman Is the World's First Computer Programmer? [closed]

  - by Sveta Bondarenko

  This week, on 10th December, we celebrate the 197th birth anniversary of Ada Lovelace, often considered as the world's first computer programmer. Ada became famous not only as a daughter of romantic poet Lord Byron but also as an outstanding 19th century mathematician. Her works on analytical engine are recognized as the first algorithm intended to be processed by a machine. Women always played a crucial role in the computer science evolution, but unfortunately, they are considered to be not so good at programming and engineering as men. Even though the fair sex makes up a growing portion of computer and Internet users, there is still a large gender gap in the field of Computer Science. But all is not lost! According to the study women's enrollment in the computer science raised from 7 percent in 1995 to 42 percent in 2000. And it is still increasing. Soon women will take a well-deserved position among the world's top computer programmers. After all, a number of notable female computer pioneers such as Ada Lovelace, Grace Hopper, and Anita Borg have proven that women make great computer scientists. But will women make great contributions to the modern technologies industry? Or successful and famous female computer programmer is just a pipe dream?

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• What was your most expensive computer rig?

  - by AlbertoPL

  I'm curious as to how much people are willing to spend on a typical computer. My most expensive machine is a gaming rig complete with an ATI Radeon HD4850, Wolfdale 3.0 GHZ Intel Core 2 Duo, 500 Gb hard drive, Antec 900 computer case, the works. I also have a 2-monitor set up. I'd have to say this thing has cost me a little more than a grand at this point, and I'd put the total value of the components at roughly $1300. So, how far have you gone with your computer rigs and has it been worth it?

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• cpu use goes to 100% when I lock the screen

  - by gianni

  Whenever I lock the screen, after a certain amount of time, the cpu and the cpu fan use go up near the limit, and it returns back to normal the moment I unlock the screen again (as shown by psensor). How can I find out what process is responsible for this? I've tried with "top -S", and the result is this... PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 2114 me 20 0 326m 104m 40m R 16 2.6 66:50.03 compiz 1234 root 20 0 396m 152m 98m R 6 3.8 20:23.88 Xorg 2204 me 20 0 160m 38m 30m S 4 1.0 0:33.35 yakuake 2446 me 20 0 206m 18m 12m S 4 0.5 6:32.18 psensor 2280 me 20 0 220m 18m 10m S 2 0.5 5:01.60 unity-panel 9138 me 20 0 154m 27m 15m S 2 0.7 0:03.63 plugin-cont 2282 me 20 0 65800 5272 3316 S 1 0.1 4:36.90 hud-service 2143 me 20 0 140m 11m 8352 S 1 0.3 2:50.16 indicator-m 9095 me 20 0 720m 253m 36m S 1 6.4 0:26.34 firefox 2076 me 20 0 7168 3484 828 S 1 0.1 1:46.53 dbus-daemon 2307 me 20 0 55000 5132 3632 S 1 0.1 2:01.55 indicator-a 2557 me 20 0 86328 6028 4576 S 0 0.1 1:44.71 conky 6290 me 20 0 2836 1296 964 R 0 0.0 0:29.64 top 6291 me 20 0 2836 1188 884 S 0 0.0 0:29.49 top 1 root 20 0 3644 1984 1284 S 0 0.0 60:57.76 init specs: ubuntu 12.04 fresh install intel core i5 4gB ram

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• Mouse cursor lag after lock screen, 64 bit 12.04

  - by Bill Jones

  Recently I have noticed that when I return to my computer after it has been "locked" for a while, the mouse pointer has significant lag. The cursor position appears to only update a few times a second. Moving the mouse results in the pointer "following" the movement in a jerky kind of way, and then continuing for some fraction of a second after I have stopped using the mouse. Replacing the mouse has no effect. (I have two differently branded and constructed usb optical mice). Plugging either mouse into a different usb port has no effect. Once the problem was resolved by "suspending" the system, and then re-starting it with the power switch, but this does not work every time. So far, the only fool-proof fix is to shut the system down and re-start it (re-boot). I have tried this suggested fix. It had no effect.

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• what, why, when, should I learn computer science?

  - by dramasea

  I'm 16 years old and really an enthusiast on web programming. I know (X)HTML, css, javascript and php. And i heard about computer science. Below are my question: What is computer science? Should a web programmer learn computer science? If the answer of question 2 is yes, then what programming language(s) should I learn before I get into computer science (I saw the video of 'Introduction to computer science' which is one of the MIT opencourse and it started to use python without teaching you from scratch.) Can I learn computer science now? (Without a university degree, I can watch open courseware.)

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• what, why, when, should I learn computer science?

  - by dramasea

  I'm 16 years old and really an enthusiast on web programming. I know (X)HTML, css, javascript and php. And i heard about computer science. Below are my question: What is computer science is? Should a web programmer learn computer science? If the answer of question 2 is yes, then what programming language should i learn before i get into computer science(I saw the video of 'Introduction to computer science' which is one of the MIT opencourse and it started to use python without teaching u from scratch) Can I learn computer science now?(Without a university degree, i can watch opencourseware)

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• Are these computer parts compatible?

  - by Jcubed

  so I'm building a computer and i want to know if all these parts are compatible. case: http://www.amazon.com/Xion-Gaming-Steel-Tower-Computer/dp/B002139YSS/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270923001&sr=8-1 power supply: http://www.amazon.com/Thermaltake-W0121RU-PurePower-Version-PCI-Express/dp/B0015MCMRG/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270924656&sr=1-1 motherboard: http://www.amazon.com/GIGABYTE-GA-EP45-UD3P-LGA-Intel-Motherboard/dp/tech-data/B001HH2WE2/ref=de_a_smtd processor: http://www.amazon.com/Intel-Processor-1333MHz-LGA775-BX80570E8400/dp/B00116SLYY/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270924524&sr=1-1 hard drive: http://www.amazon.com/Western-Digital-Caviar-Black-WD1001FALS/dp/B001C271MA/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270924586&sr=8-1 DVD/Blu Ray Dive: http://www.amazon.com/LITE-Blu-ray-Internal-Optical-iHOS104/dp/tech-data/B002EE996Q/ref=de_a_smtd Graphics Card: http://www.amazon.com/Sapphire-Radeon-100252HDMI-PCI-Express-Graphics/dp/B001SJLLTQ/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270924798&sr=1-1-spell Sound Card: http://www.amazon.com/Creative-Labs-SB0570L4-Blaster-Audigy/dp/B000LP0R3E/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270924850&sr=1-1 Memory: http://www.amazon.com/Corsair-TWIN2X4096-8500C5DF-Dominator-PC2-8500-1066MHz/dp/B0014Z0Q04/ref=sr_1_1?ie=UTF8&s=electronics&qid=1270924896&sr=1-1-spell OS: Ubuntu 64-bit

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• checking apt-get update lock file

  - by stewy613

  I have in stalled a dual boot beside windows and now I'm having a problem checking "apt-get update" when I type in apt-get update this is the outcome. I don't know what to do anthony@anthony-Inspiron-530s:~$ ls Desktop Downloads examples.desktop~ Pictures Templates Documents examples.desktop Music Public Videos anthony@anthony-Inspiron-530s:~$ apt-get update E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied) E: Unable to lock directory /var/lib/apt/lists/ E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root? anthony@anthony-Inspiron-530s:~$ apt-get upgrade E: Could not open lock file /var/lib/dpkg/lock - open (13: Permission denied) E: Unable to lock the administration directory (/var/lib/dpkg/), are you root? anthony@anthony-Inspiron-530s:~$ cd apt-get update bash: cd: apt-get: No such file or directory anthony@anthony-Inspiron-530s:~$

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