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  • Ubuntu 12.04 no network connection

    - by user115711
    I own a HP probook 4530s. I installed ubuntu 12.04 along side my windows 7 professional OS. While in window 7 everything works properly in terms of wire and wireless connection. On Ubuntu 12.04 my wired connection doesn't work at all and wireless connection works only when I check off enable wireless then recheck enable wireless. When I recheck enable wireless, the wireless connection only works for about 30 seconds then it goes offline again.

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  • Performance triage

    - by Dave
    Folks often ask me how to approach a suspected performance issue. My personal strategy is informed by the fact that I work on concurrency issues. (When you have a hammer everything looks like a nail, but I'll try to keep this general). A good starting point is to ask yourself if the observed performance matches your expectations. Expectations might be derived from known system performance limits, prototypes, and other software or environments that are comparable to your particular system-under-test. Some simple comparisons and microbenchmarks can be useful at this stage. It's also useful to write some very simple programs to validate some of the reported or expected system limits. Can that disk controller really tolerate and sustain 500 reads per second? To reduce the number of confounding factors it's better to try to answer that question with a very simple targeted program. And finally, nothing beats having familiarity with the technologies that underlying your particular layer. On the topic of confounding factors, as our technology stacks become deeper and less transparent, we often find our own technology working against us in some unexpected way to choke performance rather than simply running into some fundamental system limit. A good example is the warm-up time needed by just-in-time compilers in Java Virtual Machines. I won't delve too far into that particular hole except to say that it's rare to find good benchmarks and methodology for java code. Another example is power management on x86. Power management is great, but it can take a while for the CPUs to throttle up from low(er) frequencies to full throttle. And while I love "turbo" mode, it makes benchmarking applications with multiple threads a chore as you have to remember to turn it off and then back on otherwise short single-threaded runs may look abnormally fast compared to runs with higher thread counts. In general for performance characterization I disable turbo mode and fix the power governor at "performance" state. Another source of complexity is the scheduler, which I've discussed in prior blog entries. Lets say I have a running application and I want to better understand its behavior and performance. We'll presume it's warmed up, is under load, and is an execution mode representative of what we think the norm would be. It should be in steady-state, if a steady-state mode even exists. On Solaris the very first thing I'll do is take a set of "pstack" samples. Pstack briefly stops the process and walks each of the stacks, reporting symbolic information (if available) for each frame. For Java, pstack has been augmented to understand java frames, and even report inlining. A few pstack samples can provide powerful insight into what's actually going on inside the program. You'll be able to see calling patterns, which threads are blocked on what system calls or synchronization constructs, memory allocation, etc. If your code is CPU-bound then you'll get a good sense where the cycles are being spent. (I should caution that normal C/C++ inlining can diffuse an otherwise "hot" method into other methods. This is a rare instance where pstack sampling might not immediately point to the key problem). At this point you'll need to reconcile what you're seeing with pstack and your mental model of what you think the program should be doing. They're often rather different. And generally if there's a key performance issue, you'll spot it with a moderate number of samples. I'll also use OS-level observability tools to lock for the existence of bottlenecks where threads contend for locks; other situations where threads are blocked; and the distribution of threads over the system. On Solaris some good tools are mpstat and too a lesser degree, vmstat. Try running "mpstat -a 5" in one window while the application program runs concurrently. One key measure is the voluntary context switch rate "vctx" or "csw" which reflects threads descheduling themselves. It's also good to look at the user; system; and idle CPU percentages. This can give a broad but useful understanding if your threads are mostly parked or mostly running. For instance if your program makes heavy use of malloc/free, then it might be the case you're contending on the central malloc lock in the default allocator. In that case you'd see malloc calling lock in the stack traces, observe a high csw/vctx rate as threads block for the malloc lock, and your "usr" time would be less than expected. Solaris dtrace is a wonderful and invaluable performance tool as well, but in a sense you have to frame and articulate a meaningful and specific question to get a useful answer, so I tend not to use it for first-order screening of problems. It's also most effective for OS and software-level performance issues as opposed to HW-level issues. For that reason I recommend mpstat & pstack as my the 1st step in performance triage. If some other OS-level issue is evident then it's good to switch to dtrace to drill more deeply into the problem. Only after I've ruled out OS-level issues do I switch to using hardware performance counters to look for architectural impediments.

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  • Struct Method for Loops Problem

    - by Annalyne
    I have tried numerous times how to make a do-while loop using the float constructor for my code but it seems it does not work properly as I wanted. For summary, I am making a TBRPG in C++ and I encountered few problems. But before that, let me post my code. #include <iostream> #include <string> #include <ctime> #include <cstdlib> using namespace std; int char_level = 1; //the starting level of the character. string town; //town string town_name; //the name of the town the character is in. string charname; //holds the character's name upon the start of the game int gems = 0; //holds the value of the games the character has. const int MAX_ITEMS = 15; //max items the character can carry string inventory [MAX_ITEMS]; //the inventory of the character in game int itemnum = 0; //number of items that the character has. bool GameOver = false; //boolean intended for the game over scr. string monsterTroop [] = {"Slime", "Zombie", "Imp", "Sahaguin, Hounds, Vampire"}; //monster name float monsterTroopHealth [] = {5.0f, 10.0f, 15.0f, 20.0f, 25.0f}; // the health of the monsters int monLifeBox; //life carrier of the game's enemy troops int enemNumber; //enemy number //inventory[itemnum++] = "Sword"; class RPG_Game_Enemy { public: void enemyAppear () { srand(time(0)); enemNumber = 1+(rand()%3); if (enemNumber == 1) cout << monsterTroop[1]; //monster troop 1 else if (enemNumber == 2) cout << monsterTroop[2]; //monster troop 2 else if (enemNumber == 3) cout << monsterTroop[3]; //monster troop 3 else if (enemNumber == 4) cout << monsterTroop[4]; //monster troop 4 } void enemDefeat () { cout << "The foe has been defeated. You are victorious." << endl; } void enemyDies() { //if the enemy dies: //collapse declaration cout << "The foe vanished and you are victorious!" << endl; } }; class RPG_Scene_Battle { public: RPG_Scene_Battle(float ini_health) : health (ini_health){}; float getHealth() { return health; } void setHealth(float rpg_val){ health = rpg_val;}; private: float health; }; //---------------------------------------------------------------// // Conduct Damage for the Scene Battle's Damage //---------------------------------------------------------------// float conductDamage(RPG_Scene_Battle rpg_tr, float damage) { rpg_tr.setHealth(rpg_tr.getHealth() - damage); return rpg_tr.getHealth(); }; // ------------------------------------------------------------- // void RPG_Scene_DisplayItem () { cout << "Items: \n"; for (int i=0; i < itemnum; ++i) cout << inventory[i] <<endl; }; In this code I have so far, the problem I have is the battle scene. For example, the player battles a Ghost with 10 HP, when I use a do while loop to subtract the HP of the character and the enemy, it only deducts once in the do while. Some people said I should use a struct, but I have no idea how to make it. Is there a way someone can display a code how to implement it on my game? Edit: I made the do-while by far like this: do RPG_Scene_Battle (player, 20.0f); RPG_Scene_Battle (enemy, 10.0f); cout << "Battle starts!" <<endl; cout << "You used a blade skill and deducted 2 hit points to the enemy!" conductDamage (enemy, 2.0f); while (enemy!=0) also, I made something like this: #include <iostream> using namespace std; int gems = 0; class Entity { public: Entity(float startingHealth) : health(startingHealth){}; // initialize health float getHealth(){return health;} void setHealth(float value){ health = value;}; private: float health; }; float subtractHealthFrom(Entity& ent, float damage) { ent.setHealth(ent.getHealth() - damage); return ent.getHealth(); }; int main () { Entity character(10.0f); Entity enemy(10.0f); cout << "Hero Life: "; cout << subtractHealthFrom(character, 2.0f) <<endl; cout << "Monster Life: "; cout << subtractHealthFrom(enemy, 2.0f) <<endl; cout << "Hero Life: "; cout << subtractHealthFrom(character, 2.0f) <<endl; cout << "Monster Life: "; cout << subtractHealthFrom(enemy, 2.0f) <<endl; }; Struct method, they say, should solve this problem. How can I continously deduct hp from the enemy? Whenever I deduct something, it would return to its original value -_-

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  • Printer image correction

    - by Matthew Shinal
    Here is my problem: my printer and scanner (HP psc2410xi) prints darker than the photos taken and teh scanner has a background fuzz. I want to create and install files to have the printer lighten the photos it prints (yellow becomes dark yellow, etc) and delete the "fuzz" from the scanner image (you can see it on a blank scan and yes I did clean the scanner). I'm thinking there is a way to take a printed image, scan that in, and subtract the two images from each other to get the correction factor.

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  • How can I install Ubuntu on a Compaq DC7900?

    - by lemba
    I have an HP Compaq dc7900 Convertible Minitower from 2006: 80GB (3.5”) SATA 3.0GB/s with NCQ and Smart IV Intel Core 2 Duo E8500 I can install Ubuntu on it from a USB stick and everything seems to work fine, but when I finish and reboot the pc, grub will be shown but When I continue I get just a black screen with a blinking cursor I tried Linux Mint and OpenSuse as well but it seems there is something forbidden in the Bios. Installing Windows 8 works fine.

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  • the application compiz has closed unexpectedly

    - by Rob
    i'm a newbie to linux os, i have recently installed the latest version of ubuntu 12.10 desktop 32bit on a hp-compaq d530 desktop pc, but after a restart login screen works fine, once logged in after 20/30secs i get a window prompt with the message " the application compiz has closed unexpectedly " i have send the report and after that i am stuck with just the wallpaper / screensaver. if any one can help me out would be grateful thanks

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  • Setting up Ubuntu on my mother's computer

    - by idealmachine
    Intended use My mother had an old Compaq desktop computer running Windows 98, which she used for occasional Web browsing and playing cards. The name of her card game is Hoyle Card Games 3. Although I had to repair it several times over the last 10 years, it worked fine until it finally died at the end of last year. Hardware specifications A relative brought up a newer computer soon afterward: Operating system: Windows XP Asus K8N motherboard (with broken on-board sound; getting a sound card) Athlon 64? processor (don't remember the clock speed) 512 MB RAM Hope the graphics card works... Replacement sound card will be one of: Ensoniq ES1370 AudioPCI Diamond Monster Sound MX300 (Aureal chipset) Sound Blaster Audigy 2 SE Peripherals HP Scanjet 3400c scanner (USB connected) HP LaserJet multi-function printer (parallel port connected, and printing works with a PCL driver) Same serial mouse as old computer Question I had set up an SSH/VNC connection to allow for remotely working out problems. Or so I thought. A month later, the computer would not boot, rendering the SSH connection useless and an OS reinstall necessary. Unfortunately, I have neither the original Windows disc nor the product key. Unless I were to pay $200 for a full Windows 7 Home Premium license for my computer, I would not be able to re-install Windows XP on hers. I consider myself an advanced Linux user, having used Debian for years. So here are my questions. I have only one day to decide whether to use Ubuntu or buy Windows: A quick search leads me to believe all the hardware listed above is supposed to work with Linux, but am I mistaken? Would Ubuntu/Xubuntu suffice (specify which one if it matters), or would I be better off paying the $200 necessary for Windows XP? Is the card game likely to run on Wine? I believe the minimum system requirement is Windows 95. Failing Wine compatibility, will VirtualBox run fast enough on such a computer (Windows 98 as the guest OS)? Are there any free card games just as good? She plays mainly Bridge, Poker, and Solitaire. Is there any "Large Fonts" option for those with poor vision? The lack of it would be a big disadvantage. BONUS: Although I would probably replace the old mouse upon a move to Ubuntu, is it even possible to get a serial mouse working?

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  • Ubuntu glitches up when i boot it

    - by aaron
    I recently installed Ubuntu on an old laptop of mine(HP Compaq Presario v6000), and I am having some problems. I installed everything and followed the guide like it said, but, when I try to boot up from hard drive it displays the desktop, but everything starts to glitch out and I can't click on any applications or scroll over them without it glitching, proceeded by a lock-up. I might re-install it to see if it helps, but if not, you guys got to help me out.

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  • Will installing Ubuntu using Wubi erase Windows?

    - by James Lang
    I have an HP laptop with 2 partitions: C: and D:, with windows 7 installed in the C: drive and D: is the Recovery partition. When I try to install Ubuntu 12.04 LTS using Wubi, it only shows the C: drive for installing and not the D: drive where I wanted to format and install ubuntu. So, if I go ahead and install in the C: drive where windows 7 is already installed, would Wubi erase windows 7? Or it will just install Ubuntu as a program in windows?

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  • Making a clone of a game legal?

    - by user782220
    My question is similar to a previous question. Consider the following clone of starcraft. Change the artwork, sound, music, change the names of units. However, leave the unit hitpoints unchanged, unit damage unchanged, unit movement speed unchanged, change ability names but not ability effects. Is that considered illegal? In other words is copying the unit hp, dmg, etc. considered illegal even if everything else is changed.

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  • Display resolution in duplicate monitor

    - by Taher
    I use duplicate one monitor laptop LCD and other monitor that monitor resolution is bigger than laptop LCD how can i set laptop LCD resolution for them? when i use mirror button it set 1024 * 768 but my laptop LCD resolution is 1366 * 768 how can i set this resolution for them? because when i set this resolution i get error. My laptop is hp dv6 6080 and vga is intel sandy bridge if i change to AMD vga can i resolve this problem?

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  • Doesn't boot after installing fglrx for ati 5650

    - by elivanja
    Hi, I'm a complete noob here, I recently bought an HP 3161 with an ATI 5650 hd card, when I installed 10.04 LTS everything was working fine until I was prompted to activate proprietary driver fglrx, after I did this I couldn't reboot (not even in recovery mode) until I reinstalled 10.04, what can I do? I would appreciate any help since I haven't been able to find anyone with the same problem, thanks.

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  • After update, grub is broken.

    - by Bryan Allan
    Some months back I used wubi to install ubuntu on an hp laptop with vista. After not using it for a month or so, I loaded ubuntu and installed many updates (including kernel update). Windows boot manager loads without any problems, and I can boot to vista without problems. However, if I choose ubuntu, the screen briefly flashes Try (hd0,0) : NTFS5 and then goes to black. I never get to the kernel image selection screen.

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  • rt2800 wireless keeps disconnecting

    - by Matthew Fumi
    My HP dm1 laptop has a rt2800sta wlan driver. My wireless doesn't usually have a problem connecting to a network, yet sometimes it does. The biggest issue I have found is that when it does connect, it doesn't stay connected. It continually connects and disconnects to the network. Does anyone know why this is happening, and how I would go about fixing the issue? Thank you and look forward to trying your solutions.

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  • Supermicro motherboards and systems

    - by jchang
    I used to buy SuperMicro exclusively for my own lab. SuperMicro always had a deep lineup of motherboards with almost every conceivable variation. In particular, they had the maximum memory and IO configuration that is desired for database servers. But from around 2006, I became too lazy to source the additional components necessary to complete the system, and switched to Dell PowerEdge Tower servers. Now, I may reconsider as neither Dell or HP are offering the right combination of PCI-E slots. Nor...(read more)

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  • Une tablette signée Google sous Android pourrait bientôt venir concurrencer l'iPad, selon le New-Yor

    Bientôt une tablette signée Google Sous Android, elle pourrait venir concurrencer l'iPad, selon le New-York Times Des sources - toujours bien informées - du New York Times ont révélé que Google serait sur le point de commercialiser un Tablet PC (ou en tout cas d'essayer) pour concurrencer l'iPad d'Apple lancé la semaine dernière. Cette tablette n'embarquerait pas Chrome OS mais Android, son système d'exploitation pour mobiles. Cette concurrence pourrait être encore plu sérieuse que celle de HP (

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  • My video Card is not working at its best

    - by Chitrank Dixit
    I am using Ubuntu on hp pavillion g6 laptop but my video card intel HD graphics family is set always to standard and not performs best. When I minimize any application windows in my Ubuntu 12.04 the outline of the window remains on the screen and even it does not give me option to resize the doc at the left hand side. Please help me out I have installed mesa-utils and updated the system Even did the grub settings with nomodeset but do not know the grub settings Intel HD graphics Family (Sandybridge).

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  • Blank screen after upgrading to 10.04 to 10.10

    - by Raj
    I have upgraded my desktop to Lucid from karmic online through update manager - facing problems, request your help. After completing upgrade and then reboot, I am getting blank screen. Tried to login but unsuccessful. Also the data backup done pre-upgrade was partial, I donot want to lose data. Request to please provide steps to rollback without losing data as I am new to ubuntu. Also I have a single partition. Graphics card is agp-8x integrated (hp d530)

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  • SSDs at PASS 2012

    - by jchang
    There were 7 companies exhibiting SSD products as PASS this year, and one with a product to support SSD storage. This is not counting Dell, EMC and HP who have SSD products, but were at PASS for other reasons. This shows that many have aspirations with the hope that market leadership is not yet firmly set. The products fall into the following: PCI-E SSDs (Fusion-io, LSI, Virident) SSD SAN (Violin, TMS, Whiptail) SSD caching (LSI, GridIron) I am inclined to be of the opinion that SSD market is not...(read more)

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  • "selected bootable device failed" error dual boot ubuntu alongside windows8.1

    - by user286280
    i have hp laptop i had installed windows 8 which i upgraded to 8.1 i wanted to dual boot ubuntu 14.04 with windows 8.1 i diasbled secure boot and fast startup then used a liveusb to boot then an error msg pops up saying "the selected bootable device failed" my system boot order is : os boot manager usb hdd internal hdd so my question is that y this msg(selected boot device failed) is popping up and should i try to keep usb hdd on the top of my sysytem boot order in order to get it working??? pls reply soon

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  • system requirement

    - by Sol
    My laptop developed a bad sectors and not working well. It was with ubutuntu 12.04 LTS operating system. Now, I want to install ubuntu in an relatively old desktop with the following specifications Hp compaq dx 2390 Intel ® Pentium Dual Core CPU, E2180 @ 2.00 GHZ, 1.20 GHz, 1 GB Ram, 160 GB Hard Drive Which k/x/ubuntu version is suitable to this desktop? PS. I am working in my final thesis and I need a stable k/x/ubuntu to this specification. Thank u

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  • Oracle Magazine, November/December 2008

    Oracle Magazine November/December features articles on our Editors' Choice Awards 2008, the new HP Oracle Database Machine, using task flows, Cursor FOR Loops, Oracle Data Access Components, Oracle Active Data Guard, SQL Developer and PL/SQL constructs, Oracle Database 11g, questions for Tom Kyte and much more.

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  • How to fix SLOW graphics printing on Ubuntu 12.10? Text is OK

    - by vbasic246
    Ubuntu 12.10 32-bit upgrade (dual boot with Win-7). Custom PC, onboard NVidia graphics. Motherboard: ECS EliteGroup GF8200A Black Series "HP LaserJet 3015" multifunction printer. Graphics printing fine with UB12.04, VERY SLOW on UB12.10. Per an article ran: ~$ sudo apt-get install mesa-utils ~$ glxinfo | grep renderer Output: OpenGL renderer string: GeForce 8200/integrated/SSE2/3DNOW! Do I need to get a graphics card to fix or will software tweaks solve this?

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