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• Ubuntu 12.04 LTS loops the login screen unless you login as Guest

  - by Mário Silva

  I am running a VMWare Player with a Ubuntu 12.04 LTS Precise Pangloin as Guest on my Windows 7. Sometimes I get the shutdown blue screen error in Windows, this time it happened when I was running the Player. When I restarted everything Ubuntu gave the not so unfamiliar in this forum Login Loop in adminstrator login. I login and there's this black screen where I can only read: "piix4...smbus:0.0.0.07.3 Host Smbus controller not enabled" . When I go to the Prompt in root mode it fails to update and only upgraded, specially some plugins ( I think graphic plugins) which also appear in one an error message after quitting the prompt, but they´are successfully installed. They are not the error message. After that I have been working with the Fail/safe Mode recovery panel. When I try to update via Root I get errors like this: W:failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/release.gpg could not resolve 'extras/ubuntu.com There are 8 more like this referring to areas like: -archive/canonical.com -ppa.Launchpad.net -security.Ubuntu.com -Us.archive.ubuntu.com - release.gpg precise-updates/release.gpg precise_backport/release.gpg Final Message: some index files failed to download.....they have been ignored or old files are used. The black screens most of the time pass by too fast for me to pick up any information. But in general I think I have done everything I was able to in the recovery panel including updating network and graphic packages and recovering filesystem packages and the basic stuff ( I am a beginner regarding Linux ) in the root prompt. Now I am stuck in this screen with graphic options: - Run in low-graphics mode just for one session - Reconfigure Graphics - Troubleshoot the error - Exit to console login I am trying to choose to reconfigure graphics but the mouse disappears in the virtual machine screen and sometimes when options change ity´s only the first and last option. ut this happens from the blue without messages. This particular option menu is in the regular GUI style against a black screen in Terminal style. Really strange. Thanx in advance, all is welcome and appreciated.

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• Password-free logins using your email address only?

  - by Mario

  The state of logins is horrendous. With each site having it's own rules for passwords, it can be very hard to remember what variation you used on any given site. Logins are pure pain. One thing I love about Craigslist is that it did away with logins altogether. I know this design may not suit every site, but there's something to their design that beckons to be repeated. OpenID is great on sites that have adopted it, but it's still not standard. Would it be feasible/wise to use an email address as a login and provide no password? The site would send a short-term key directly to your email address. You click on the link and you're in. When you're done, you "logout" and your key is terminated. I've toyed with this idea before. What concerns (i.e. spammers, bots, etc.) would make this impractical or unsafe and could they be overcome?

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• Multiple render targets and gamma correctness in Direct3D9

  - by Mario

  Let's say in a deferred renderer when building your G-Buffer you're going to render texture color, normals, depth and whatever else to your multiple render targets at once. Now if you want to have a gamma-correct rendering pipeline and you use regular sRGB textures as well as rendertargets, you'll need to apply some conversions along the way, because your filtering, sampling and calculations should happen in linear space, not sRGB space. Of course, you could store linear color in your textures and rendertargets, but this might very well introduce bad precision and banding issues. Reading from sRGB textures is easy: just set SRGBTexture = true; in your texture sampler in your HLSL effect code and the hardware does the conversion sRGB-linear for you. Writing to an sRGB rendertarget is theoretically easy, too: just set SRGBWriteEnable = true; in your effect pass in HLSL and your linear colors will be converted to sRGB space automatically. But how does this work with multiple rendertargets? I only want to do these corrections to the color textures and rendertarget, not to the normals, depth, specularity or whatever else I'll be rendering to my G-Buffer. Ok, so I just don't apply SRGBTexture = true; to my non-color textures, but when using SRGBWriteEnable = true; I'll do a gamma correction to all the values I write out to my rendertargets, no matter what I actually store there. I found some info on gamma over at Microsoft: http://msdn.microsoft.com/en-us/library/windows/desktop/bb173460%28v=vs.85%29.aspx For hardware that supports Multiple Render Targets (Direct3D 9) or Multiple-element Textures (Direct3D 9), only the first render target or element is written. If I understand correctly, SRGBWriteEnable should only be applied to the first rendertarget, but according to my tests it doesn't and is used for all rendertargets instead. Now the only alternative seems to be to handle these corrections manually in my shader and only correct the actual color output, but I'm not totally sure, that this'll not have any negative impact on color correctness. E.g. if the GPU does any blending or filtering or multisampling after the Linear-sRGB conversion... Do I even need gamma correction in this case, if I'm just writing texture color without lighting to my rendertarget? As far as I know, I DO need it because of the texture filtering and mip sampling happening in sRGB space instead, if I don't correct for it. Anyway, it'd be interesting to hear other people's solutions or thoughts about this.

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• Term for unit testing that separates test logic from test result data

  - by mario

  So I'm not doing any unit testing. But I've had an idea to make it more appropriate for my field of use. Yet it's not clear if something like this exists, and if, how it would possibly be called. Ordinary unit tests combine the test logic and the expected outcome. In essence the testing framework only checks for booleans (did this match, did the expected result result). To generalize, the test code itself references the audited functions, and also explicites the result values like so: unit::assert( test_me() == 17 ) What I'm looking for is a separation of concerns. The test itself should only contain the tested logic. The outcome and result data should be handled by the unit testing or assertion framework. As example: unit::probe( test_me() ) Here the probe actually doubles as collector in the first run, and afterwards as verification method. The expected 17 is not mentioned in the test code, but stored or managed elsewhere. How is this scheme called? Or how would you call it? I hope I can find some actual implementations with the proper terminology. Obviously such a pattern is unfit for TDD. It's strictly for regression testing. Also obviously, it cannot be used for all cases. Only the simpler test subjects can be analyzed that way, for anything else the ordinary unit test setup and assertion steps are required. And yes, this could be manually accomplished by crafting a ResultWhateverObject, but that would still require hardwiring that to the test logic. Also keep in mind that I'm inquiring for use with scripting languages, and not about Java. I'm aware that the xUnit pattern originates there, and why it's hence as elaborate as it is. Btw, I've discovered one test execution framework which allows for shortening simple test notations to: test_me(); // 17 While thus the result data is no longer coded in (it's a comment), that's still not a complete separation and of course would work only for scalar results.

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• How to stop gecko-mediaplayer from buffering endlessly?

  - by mario

  I'm using the gecko-mediaplayer plugin (formerly "mplayerplug-in"). The totem plugin was not always working correctly with Opera, and I'm actually depending on the [Copy URL] feature of gecko-mediaplayer. However that plugin does some inept buffering of videos. It seems to default to 20% caching regardless of what you set in the preferences window. This is quite annoying for big video files. But appearantly it's by design http://groups.google.com/group/gecko-mediaplayer/browse_thread/thread/b7f0f5a3cedc8979 The Gentoo forums listed some workaround http://forums.gentoo.org/viewtopic-t-816690.html - but ~/.config/gecko-mediaplayer/gecko-mediaplayer.conf is not working in the Ubuntu version. Does anyone know the actual way to configure the cache= size. Which is the real configuration filename under Ubuntu?

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• apt-get 32 bit package on amd64 Ubuntu installation

  - by mario

  I was trying to get a game working. But I have Lucid Lynx on amd64 running while the game binary was 32 bit (no 64 bit version available and nobody was in the mood for recompiling). It lacked libfsml-windows1.5 to run, and apt-getting it failed. So I have to manually download the i386 packages and force install them. (No, not part of ia32libs.) Now I'm wondering if there is an automated way to have x86 packages downloaded at least on a 64-bit installation. apt-get -o apt::architecture=i386 did not work. (If you switch the architecture mode it doesn't find the package or assumes missing dependencies for existing packages all around.) Is there another tool to automate that? Possibly one which downloads the i386 packages and relocates contained libraries into /usr/lib32/ implicitely?

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• Unity 3D doesn't work on ubuntu 12.04 LTS in virtual box hosted by Windows 7 64bit

  - by Mario

  Can't google out the solution through some time so I'm asking here. I have installed Linux Ubuntu 12.04 LTS in virtual box hosted by Windows 7 64bit Simple my 3D stopped working after some kernel headers update<<< few months ago. Just like that. I don't member which version was it. In meantime there was 2 or 3 new releases of VirtualBox which I have installed. Every time I am updating VirtualBox Guest Additions to the newest version. My 3D in Ubuntu still doesn't work. root@pjadmin-VirtualBox:~# /usr/lib/nux/unity_support_test -p OpenGL vendor string: VMware, Inc. OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 0x300) OpenGL version string: 2.1 Mesa 8.0.2 Not software rendered: no Not blacklisted: yes GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: no My graphics card in PC is ATI 6850. Please help.

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• Backlight screen flickering on a Sony Vaio VPCYB15AL

  - by Mario Zavala

  I've just installed Ubuntu 11.10, and everything went just now when the computer got into suspension, when it got back the screen started flickering, specially on the dashboard, it trends to disappear when i turn down the backlight, at first it was fixed by rebooting the system and now, every time that I start Ubuntu as soon as the desktod loads it starts flickering again, please help! I have a Sony VAIO VPCYB15AL AMD Dual Core E350 with an ATI HD 6310.

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• Getting software development Jobs oversees [on hold]

  - by Mario Dennis

  I live in Jamaica and I am currently pursuing a Bsc. in Computer Information Science. I have worked on a few projects and have learn Struts 2, Play Framework, Spring, Mockito, JUnit, Backbone.js etc in my spear time. I have also learn about SOLID and DRY software development as well as architecting software system using Service Oriented Architecture and N-tier Architecture. What I want to know is given all of this can I get a job oversees before completing a degree, how difficult will it be, and what is the best way to go about doing it?

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• When is it ever ok to write your own development tools? (editor into IDE)

  - by mario

  So I'm foremost using a text editor for coding. It's a very bare bones editor; provides mostly just syntax highlighting. But on rare occasions I also need to debug something. And that's when I have to resort to an IDE (mostly Netbeans, but got fiddly Eclipse/Aptana working as second fallback). For general use however IDEs feel not workable to me. It's a visual thing, being used to console UIs etc. And switching back and forth between a text editor and an IDE is slightly cumbersome too. That's why I'm considering extending the editor, not really into a full-fledged IDE - but at the very least integrate a debug feature. Since I'm working on PHP, it seems not that much effort. The DBGp allows to externalize a debug handler from the editor, so it's just minor integration work and figuring out how to shoehorn a breakpoint feature into the editor (joe btw). And while I've also got time to do that, I'm wondering if this is really worthwhile. In this case it's not a needed development tool. It's just for convenience. And the cause for doing it is basically just not liking the existing solution. While over time I might extend and adapt this debugger thing, it initially will be as circumstantial as Eclipse. It inevitably starts out as poor development tool. Furthermore there is likely not much reuse. (Okay, this is not an important point. Most such software exists sans much of a use case. And also obviously, similar extensions already exist for emacs and vim, so it cannot be completely pointless.) But what's a general guideline on attempting to conoct custom development tools, particularily if they are not really needed but satisfy personal preferences? (Usability enhancement not certain.)

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• Configure application priority to access the network

  - by Mario

  I noticed that when I am running applications such BitTorrent all the other applications have trouble accessing the network. I am sure it would be possible to limit BitTorrent's network usage but what I really want is to be able to set priorities to applications (or protocols) accessing the network. For example, let's say I put max priority for the browser (or http) and then, no matter how much bandwidth was using at the time, the http packets would always go through. Is this possible? Is there an application for Ubuntu to do this or a way to configure this on Ubuntu directly?

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• Is it legal or good idea to have a backup of all client sites on my own server

  - by mario

  I have seen many times that if we build a website for a client then there is a possibility that this site gets changed over a period of time. I was thinking that from now onwards whichever site I make I will host a copy of the site on a personal server. Like client1.myserver.com so that even if they change it I have the copy of it. So that if I need to show someone or I need to refer myself few things I have the proof there. I will not make them public but will password protect it. I want to know whether this is legal and a good idea or not.

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• Hibernation still not available

  - by Mario

  tried the workaround posted here How to enable hibernation? but not even after rebooting, updating grub or kilall unity-panel-service commands do reset unity but no hibernation is available on "start" button. when sudoedit file saves as /vm etc etc, tried chaging this name to the /etc/polkit loclauth etc etc but wouldnt let me save the file there must be doing something wrong, because I browse to /etc/polkit-1/localauthority/50-local.d and there are no files there

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• Nifty gui hide/show image

  - by Mario

  I have a simple screen made with Nifty gui. On this game screen I want to put a simple image controls sound: just on and not. So I have two images to switch and get music stop or run. Problem is: how can I hide/disply an image with nifty gui? Here my java code when player click on image: Screen screen = nifty.getCurrentScreen(); Element el = screen.findElementByName("iconOn"); el.setVisible(false); el = screen.findElementByName("iconOff"); el.setVisible(true); This code doesn't work :( Thanks to everyone could help me

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• Is it possible to De-Serialize a new Derived class using Old Binary?

  - by Anand

  In my project I have a class which I Serialize in Binary format to the disk. Due to some new requirement I need to create a new class which is derived from the original class. eg [Serializable] public class Sample { String someString; int someInt; public Sample() { } public Sample(String _someString, int _someInt) { this.someInt = _someInt; this.someString = _someString; } public String SomeString { get { return someString; } } public int SomeInt { get { return someInt; } } } [Serializable] public class DerivedSample : Sample { String someMoreString; int someMoreInt; public DerivedSample () : base() { } public DerivedSample (String _someString, int _someInt, String _someMoreString, int _someMoreInt) : base(_someString, _someInt) { this.someMoreString = _someMoreString; this.someMoreInt = _someMoreInt; } public String SomeMoreString { get { return someMoreString; } } public int SomeMoreInt { get { return someMoreInt; } } } When I try to De serialize an old file which contains only object of Sample it works fine, in the current assembly. That means backward compatibility is there. But when I try to deserialize the file which contains object of DerivedSample using the previous version of the assembly application crashes. Which means forward compatibilty needs to be taken care off... It it possible to say read only the base class part of the object from new version of the file?

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• Strange performance differences in read/write from/to USB flash drive

  - by Mario De Schaepmeester

  When copying files from my 8GB USB 2.0 flash drive with Windows 7 to a traditional hard drive, the average speed is between 25 and 30 MB/s. When doing the reverse, copying to the USB drive, the speed is 5MB/s average. I have tested this with about 4.5GB of files, a mixture of smaller and larger ones. The observations were the same on both FAT32 and exFAT file systems on the USB drive, NTFS on the internal hard disk. I don't think I can be mistaken in saying that flash memory has a lot higher performance than a spinning hard drive in both terms of reading and writing. For both memory types, reading should be faster than writing too. Now I wonder, how can it be that copying files from a fast read memory to a faster write memory is actually slower than copying files from a fast read memory to a slow write memory? I think that the files are stored in RAM before being copied over too, and there's caching as well, but I don't see how even that could tip the balance. It can only be in the advantage of writing to the USB drive, since it is "closer" to the SATA system than the USB port and it will receive data from the internal SATA HDD faster. Perhaps my way of thinking is all wrong or it just depends on the manufacturer of the USB pen. But I am curious.

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• How to setup nginx and a subdomain

  - by Evolutio

  i have gitlab installed on my server and it works on all domains eg: git.lars-dev.de, lars-dev.de and *.lars-dev.de how I can run gitlab only on git.lars-dev.de and another subdomain on files.lars-dev.de? my lars-dev conf: server { listen *:80; ## listen for ipv4; this line is default and implied #listen [::]:80 default_server ipv6only=on; ## listen for ipv6 root /var/www/webdata/lars-dev.de/htdocs; index index.html index.htm; server_name lars-dev.de; location / { try_files $uri $uri/ /index.html; } #error_page 500 502 503 504 /50x.html; #location = /50x.html { # root /usr/share/nginx/www; #} # deny access to .htaccess files, if Apache's document root # concurs with nginx's one # #location ~ /\.ht { # deny all; #} } and the gitlab configuration: upstream gitlab { server unix:/home/git/gitlab/tmp/sockets/gitlab.socket; } server { listen *:80; # e.g., listen 192.168.1.1:80; In most cases *:80 is a good idea server_name git.lars-dev.de; # e.g., server_name source.example.com; server_tokens off; # don't show the version number, a security best practice root /home/git/gitlab/public; # individual nginx logs for this gitlab vhost access_log /var/log/nginx/gitlab_access.log; error_log /var/log/nginx/gitlab_error.log; location / { # serve static files from defined root folder;. # @gitlab is a named location for the upstream fallback, see below try_files $uri $uri/index.html $uri.html @gitlab; } # if a file, which is not found in the root folder is requested, # then the proxy pass the request to the upsteam (gitlab unicorn) location @gitlab { proxy_read_timeout 300; # https://github.com/gitlabhq/gitlabhq/issues/694 proxy_connect_timeout 300; # https://github.com/gitlabhq/gitlabhq/issues/694 proxy_redirect off; proxy_set_header X-Forwarded-Proto $scheme; proxy_set_header Host $http_host; proxy_set_header X-Real-IP $remote_addr; proxy_pass http://gitlab; } }

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• Why does my computer beep when i type <shift>-DE quickly?

  - by Bedwyr Humphreys

  I'm writing a report on developing EJBs in Jdeveloper and every time i type "IDE" my laptop beeps twice in quick succesion. Actually, whilst typing this I've worked out that any combination of shift plus two adjacent keys, one from the row that starts qwerty and one from the row that starts asdfg will beep. It's really quite annoying. It's a hp laptop. Anyone know how I can make it stop?

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• External HDD is always in use when trying to safely remove

  - by Mario De Schaepmeester

  I have a WD 1TB Elements external hard drive and every time I use the Windows 7 "safely remove" feature, it gives me a dialog telling that a process is using the disk. Using Sysinternals Process Explorer and the answer on this question (find everything with the drive letter) I get the following result: What is the $Extend folder and why is it in use? How can I disable it? I cannot remove it using the command line (access denied). Edit: I've followed the instructions over here and under the registry key HKLM\SYSTEM\CurrentControlSet\Control\BackupRestore\FilesNotToBackup I have a Multi-String Value named IgnoreNTFS with data \$Extend* /s But this does not make any difference. Also this question is not about a server. Additionally I can tell that I use a program called mkv2vob to convert video files with a Matroska container into something my PS3 will play. I convert the source files straight from my external HDD, but I would expect if this program does not release the lock on the HDD, surely it cannot be locked if the process isn't even running?

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• Which protocol do clients use when communicating with servers in a SAN

  - by Mario De Schaepmeester

  I'm trying to wrap my head around how a SAN works and how it is implemented. If I understand this well, clients wanting to access the storage devices in a SAN need to communicate with the servers via the LAN. When the SAN is implemented with Fibre Channel, these servers are Fibre Channel compliant devices, and internally in the SAN they work with the Fibre Channel Protocol. Both data and communications are supported by Fibre Channel. But which application-layer protocol do the clients use in the LAN to communicate with the servers? Is the data simply transferred via ethernet as well? This is some part I am stuck on. I went trough a lot of sources but most sources don't really mention protocols and if they do, they only mention FCP.

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• Webmin apache on CentOS 6.3 results in 403 forbidden, permissions are OK

  - by Mario De Schaepmeester

  First of all, I will mention that the permissions are fine for the document root directory, which is /webapps/nimbus/www/public_html The www directory contains a PHP application. PHP is a problem for later if it doesn't work, as I've tested it with a plain html file (does not work either) I just get 403 forbidden responses. The permissions are 755 on webapps and all subdirectories. I've checked other questions here and on the internet, but it was all about those permissions. Whatever info you still need, just ask, I don't know what's relevant as it's the first time ever I'm using webmin or configuring apache.

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• Disadvantages of enabling AHCI after Win7 install

  - by Mario De Schaepmeester

  I've formatted my notebook that has a 5400RPM HDD with ~500GB capacity. After installing Windows 7 and about half the drivers (including chipset) I began to doubt whether to go for IDE or AHCI mode for my hard drive. There used to be a lot of discussion on the internet which is better and so far I understood it was particularly helpful on SSDs. Now the general consensus seems to be that AHCI mode is best for most hard drives. I have thus enabled AHCI in the middle of configuring my notebook (rest of the drivers, necessary software etc...) Two questions: considering my HDD's spec above, should I leave it on? Is there any disadvantage of enabling it after Windows 7 and chipset drivers installation? Windows 7 version is 64 bit Home Premium.

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• Which Windows OS Supports 8 GB RAM in a Laptop and Suggestions for a Better Laptop for Personal & De

  - by Ellen

  I am about to purchase a laptop and have zeroed on the following two of them. Toshiba L500-ST2544 Toshiba L505-ES5034 The Common Specification for both of them are as follows - RAM - 4GB DDR3 Memory HDD - 320 GB Processor - Intel® Core™ i3-330M Processor WebCam and Mic - Available HDMI Port - Available Numeric Key Pad - Available Windows 7 (64 bit) Home Premium Now, the only difference between ST2544 and ES5034 is that, the ST2544 has a maximum of 2 slots with 2 GB in each. So, you can have a max of 4 GB RAM in that. The ES5034 can support 8 GB RAM, so, in a couple of years, if I want to add another 4 GB RAM I will be able to do it. The price for ST2544 is USD 629.00 whereas, the price for a ES5034 is USD685. A difference is USD 55.00 (not a major amount, but still something extra). Is it worthwhile going for the ES5034? Which Windows Operating System supports 8 GB of RAM?

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• De-duplicating backup tool on a block basis? [closed]

  - by SST

  I am looking for an (ideally free as in speech or beer) backup tool for Unix-like OS which can store deduplicated backups, i.e. only nonredundant content takes up additional space. I already looked at dirvish (my first candidate) and rsnapshot which use hardlinks to achieve deduplication on a per-file level. However, as I want to back up large files (Thunderbird mailboxes 3GB, VMware images 10GB), such file are stored again entirely even if just a few bytes change. Then there are rsync-based tools like rdiff-backup which only store deltas and a current mirror. However, as the deltas are generated against each previous mirror, it is difficult to fine-tune the retention granularity (only keep one backup after a week, etc.) because the deltas would have to be re-evaluated. Another approach is to partition content into blocks and store each block only if it is not stored yet, otherwise just linking it to the first occurrence. The only tool I know of that does this by now is obnam (http://liw.fi/obnam), and it even supports zlib-compression and gpg-encryption -- nice! But it is very slow, AFAICT. Does any one know any other, solid backup software which supports deduplication on a sub-file level, ideally with at least some management options (show/select/delete generations...)?

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• Why do people like widescreen when it is, de facto, less space?

  - by Kerry

  I find that many of my friends/non-programmers or designers like widescreens. It makes very little sense to me as you in fact have less space than a 4:3 (do the math). The closer to a perfect square the more space you actually have on your screen. I got a 21" 16:9 and two 19" 4:3 The 21" is nearly the same height, but I think its a tenth of an inch shorter if I'm correct. I forget the calculation but it is nearly the same actual space. I can understand if you're using your computer for constant movie-watching but I think that's more of people's "ideal" than a reality. Thoughts?

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