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• Detecting bad jpeg images

  - by Gerard Cerchio

  The question on validating jpegs on network transfer is very helpful. Could we take this question one step further? What if the image data is incomplete or corrupt from the server? The complete transport works, the MIME type is image/jpeg, the UIImage is constructed and non-nil but the renderer discovers inconsistencies in the data and the log shows "Bad Huffman code" or "premature end of data segment" How would I capture this error before tossing the UIImage into the view context and thereby getting a not-pretty image on the screen? Could I render it to a non-screen context and capture the error?

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• File upload help in JSP /Struts 1.2

  - by user57421

  Hi All, I have seen lot of reviews and have not been able to figure out how I can solve my problem.. Problem: Currently we have a page to upload the file from local machine to the respositry. It is currently using Struts upload. Now the current requirment is, Since users upload around 1gb of file, they are made to wait for a long time.. So they changed the requirment to browse the file and select the file to upload and hitting upload button should return to the control to next screen imediately.. But the upload process some how needs to be pushed at the backend and should do the upload and send out an email once the upload is complete.. I'm not able to figure out how to transfer the control to next page, when the upload is still running ... any idea or help will be appreicated.. Regards, Senny

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• Vista x64: Improving troubleshoot approach skills

  - by Chau

  I'm not a Windows SuperUser, but neither just the regular user. I don't mind browsing the Registry, using Process Explorer, reading the Event logs, (un)installing new drivers and so on, but all this only makes me solve some problems. I tend though to run into problems where these tools aren't enough. Which tools should I learn about to improve my troubleshooting skills in Windows? Currently I'm using Windows Vista x64 (not moved to 7 yet), facing audio/video stuttering problems and I think this is a good place to improve my troubleshooting skills. I know this post is similar to this question, but my machine is only hanging occationally. Specs: Intel Q6600 Stock speed ASUS P5QD Turbo 4GB ram NVIDIA GTS-8800 640 HDA Xplosion 7.1 Seasonic 430W Windows Vista Business x64

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• Corporate Wiki Organization - Technical Documentation

  - by Dave Jarvis

  Corporations have documents describing various aspects of their technical systems, including: Custom Applications Custom Development Frameworks Third Party Applications Accounting Bug Tracking Network Management How To Guides User Manuals Software Tools Web Browsers Development IDEs Graphics GIMP xv Text Editing File Transfer ncFTP WinSCP Hardware Servers Web Database Exchange File Network Devices Printers What other items are missing from the list, and how would you organize it? (For example, would Software Tools make more sense under Third Party Applications?) Try to think about where you, a software developer, would expect to find the information by browsing (not searching). A few constraints: The structure should not go beyond three levels deep. Avoid the word "and" in favour of two different categories. Keep the structure general: it should appy as broadly as possible. Target audience is primarily technical.

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• Why use multiple OpenGL context

  - by Luca

  For rendering I have a current GL context, associated to a window. In the case the application render multiple scenes (for example using accumulation or different viewports) I think it is ok to reuse the same context. My question, indeed, is: why should I use multiple GL context? I red on ARB_framebuffer_object extension spec that MakeCurrent call could be expansive, and in the case the ARB_framebuffer_object extension is present I can render on a generic buffer without using MakeCurrent. Apparently the only reason to use multiple GL context is to avoid to setup context state (pixel store, transfer, point size, polygon stipple...) or to have avaialable multiple render buffers configuration (one context with accumulation, another without). How to determine when is better an alternative context instead of setting context state? Thankyou all!

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• Best SQL Server Configuration with this hardware.

  - by DavidStein

  I just received my new SQL Server from Dell. The server will be serve approximately 15 OLTP databases which average 10GB in size. Here are the basic specs: Dell PowerEdge R510 with up to 12 Hot Swap HDDs,LED Intel Xeon E5649 2.53GHz, 12M Cache, 5.86 GT/s QPI, 6 core (Quantity of 2) 48GB Memory (6x8GB), 1333MHz Dual Ranked RDIMMs for 2 Processors, Optimized PERC H700 Integrated RAID Controller, 1GB NV Cache 300GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 4) 600GB 15K RPM SA SCSI 6Gbps 3.5in Hotplug Hard Drive (Quantity of 6) My first thought was to use 3 arrays. OS - Raid 1 - (2)300GB T-Log - Raid 1 (2)300GB DB - Raid 5 (5) 600GB Backup - (1) 600GB - non-raided. However, I could also do the following after purchasing one more drive for backup. OS and T-Log - Raid 10 - (4)300GB DB - Raid 10 (6)600GB The hard drive space is not an issue as the databases are not that large. I'm just trying to optimize the speed of the applications using these databases. So, what would you guys recommend?

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• How to determine the used size of device associated's buffer

  - by dubbaluga

  Hi, when mounting a device without the "sync" option, e. g. by invoking the following: mount -o async /dev/sdc1 /mnt a buffer is associated with a device to optimize (speed) read/write operations. Is there a way to determine the size of this buffer? Another question that comes into my mind is, if it's possible to find out how much of it is used currently. This can be interesting to determine the time it would take to "sync" or "umount" slow devices, such as flash-based media. Thanks in advance for your answers, Rainer

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• java: how to get a string representation of a compressed byte array ?

  - by Guillaume

  I want to put some compressed data into a remote repository. To put data on this repository I can only use a method that take the name of the resource and its content as a String. (like data.txt + "hello world"). The repository is moking a filesystem but is not, so I can not use File directly. I want to be able to do the following: client send to server a file 'data.txt' server compress 'data.txt' into a compressed file 'data.zip' server send a string representation of data.zip to the repository repository store data.zip client download from repository data.zip and his able to open it with its favorite zip tool The problem arise at step 3 when I try to get a string representation of my compressed file. Here is a sample class, using the zip*stream and that emulate the repository showcasing my problem. The created zip file is working, but after its 'serialization' it's get corrupted. (the sample class use jakarta commons.io ) Many thanks for your help. package zip; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.util.zip.ZipEntry; import java.util.zip.ZipInputStream; import java.util.zip.ZipOutputStream; import org.apache.commons.io.FileUtils; /** * Date: May 19, 2010 - 6:13:07 PM * * @author Guillaume AME. */ public class ZipMe { public static void addOrUpdate(File zipFile, File ... files) throws IOException { File tempFile = File.createTempFile(zipFile.getName(), null); // delete it, otherwise you cannot rename your existing zip to it. tempFile.delete(); boolean renameOk = zipFile.renameTo(tempFile); if (!renameOk) { throw new RuntimeException("could not rename the file " + zipFile.getAbsolutePath() + " to " + tempFile.getAbsolutePath()); } byte[] buf = new byte[1024]; ZipInputStream zin = new ZipInputStream(new FileInputStream(tempFile)); ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile)); ZipEntry entry = zin.getNextEntry(); while (entry != null) { String name = entry.getName(); boolean notInFiles = true; for (File f : files) { if (f.getName().equals(name)) { notInFiles = false; break; } } if (notInFiles) { // Add ZIP entry to output stream. out.putNextEntry(new ZipEntry(name)); // Transfer bytes from the ZIP file to the output file int len; while ((len = zin.read(buf)) > 0) { out.write(buf, 0, len); } } entry = zin.getNextEntry(); } // Close the streams zin.close(); // Compress the files if (files != null) { for (File file : files) { InputStream in = new FileInputStream(file); // Add ZIP entry to output stream. out.putNextEntry(new ZipEntry(file.getName())); // Transfer bytes from the file to the ZIP file int len; while ((len = in.read(buf)) > 0) { out.write(buf, 0, len); } // Complete the entry out.closeEntry(); in.close(); } // Complete the ZIP file } tempFile.delete(); out.close(); } public static void main(String[] args) throws IOException { final String zipArchivePath = "c:/temp/archive.zip"; final String tempFilePath = "c:/temp/data.txt"; final String resultZipFile = "c:/temp/resultingArchive.zip"; File zipArchive = new File(zipArchivePath); FileUtils.touch(zipArchive); File tempFile = new File(tempFilePath); FileUtils.writeStringToFile(tempFile, "hello world"); addOrUpdate(zipArchive, tempFile); //archive.zip exists and contains a compressed data.txt that can be read using winrar //now simulate writing of the zip into a in memory cache String archiveText = FileUtils.readFileToString(zipArchive); FileUtils.writeStringToFile(new File(resultZipFile), archiveText); //resultingArchive.zip exists, contains a compressed data.txt, but it can not //be read using winrar: CRC failed in data.txt. The file is corrupt } }

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• What DVCS support Unicode filenames?

  - by Craig McQueen

  I'm interested in trying out distributed version control systems. git sounds promising, but I saw a note somewhere for the Windows port of git that says "don't use non-ASCII filenames". I can't find that now, but there is this link. It's put me off git for now, but I don't know if the other options are any better. Support for non-ASCII filenames is essential for my Japanese company. I'm looking for one that internally stores filenames as Unicode, not a platform-dependent encoding which would cause endless grief. So: What DVCS support Unicode filenames? In both Windows and Linux? Ideally, with the possibility to transfer repositories between Windows and Linux machines with minimal issues?

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• IIS7 FastCGI downloads quit at 4128760 bytes on slow connections

  - by eingko

  I'm using FastCGI via IIS7 to host a PHP application. For whatever reason downloads that are streamed via PHP (i.e. a script that outputs a file/bytes as a response) download perfectly fine on high-speed connections but on anything slower (even on DSL) quits at EXACTLY 4128760 bytes (~3.9MB) - which makes me think it's a configuration issue... We only started having this problem when we switched from Apache to IIS - this also points to a configuration problem, I think. But if it's a configuration issue, why would it only affect slower connections? Does anyone know where (or how) I could possibly change a setting like this? I've tried changing the idleTimeout, executionTimeout, and activityTimeout values in my web.config but this hasn't helped at all. Any help or direction would be greatly appreciated. Thanks in advance.

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• RIA Services and Shared domainlogic??

  - by NPehrsson

  I'm kind of disappointed at Ria Services. I like to work in a domain driven design way, so for example if I'm working with an invoicing system I have an object invoice which will have all methods on it to for example calculate total price from its invoice rows. public decimal Amount { get {return Entries.Sum(x => x.Amount);} } I like to have methods to add a new row to validate in data. public void AddInvoiceRow(Article article, decimal quantity) This is functionality I need on both client and server side. Have I missed something big or is RIA Services not for me? (In the whole, I don't like Silverlight restrictions at all, I mean that we need get; set on every data field we want to transfer for example some fields are not public at all in domain driven design but the technique Silverlight offers forcing us to do bad coding.)

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• [UIView didCreateWorkout:Type:Distance:Time:Message:]: unrecognized selector sent to instance.

  - by Stephen

  Hello, I'm getting the above error and have been looking at it all day, I'm getting no where fast. Anyone any ideas ? I'm new to IPhone Development. Code Below: #import "WorkoutViewController.h" #import "Workout.h" @implementation WorkoutViewController @synthesize workoutDelegate; //@synthesize Speed; //@synthesize Calories; @synthesize route; @synthesize type; @synthesize distance; @synthesize time; @synthesize message; @synthesize DBContents; @synthesize workoutArray; @synthesize managedObjectContext; //@synthesize saveWorkout; //@synthesize cancelWorkout; -(IBAction)hideKeyboard { } -(IBAction)saveWorkout { [workoutDelegate didCreateWorkout: route.text Type: type.text Distance: distance.text Time: time.text Message: message.text]; } -(IBAction)cancelWorkout { [self.workoutDelegate didCancelWorkout]; } // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. -(void)viewDidLoad { //Set images for Save & Cancel buttons. UIImage *normalImage = [[UIImage imageNamed:@"whiteButton.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0]; [saveWorkout setBackgroundImage:normalImage forState:UIControlStateNormal]; [cancelWorkout setBackgroundImage:normalImage forState:UIControlStateNormal]; UIImage *pressedImage = [[UIImage imageNamed:@"blueButton.png"] stretchableImageWithLeftCapWidth:12.0 topCapHeight:0.0]; [saveWorkout setBackgroundImage:pressedImage forState:UIControlStateHighlighted]; [cancelWorkout setBackgroundImage:pressedImage forState:UIControlStateHighlighted]; //Fetch details from the database. NSFetchRequest *request = [[NSFetchRequest alloc] init]; NSEntityDescription *entity = [NSEntityDescription entityForName:@"Workout" inManagedObjectContext:managedObjectContext]; [request setEntity:entity]; NSError *error; self.workoutArray = [[managedObjectContext executeFetchRequest:request error:&error] mutableCopy]; [request release]; //self.workoutArray = [[NSMutableArray alloc] init]; //self.DBContents.text = [self.workoutArray objectAtIndex:0]; [super viewDidLoad]; } -(void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } -(void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } -(void) didCreateWorkout:(NSString *)thisRoute Type:(NSString *)thisType Distance:(NSString *)thisDistance Time:(NSString *)thisTime Message:(NSString *)thisMessage { // Add the new workout. Workout *newWorkout = [NSEntityDescription insertNewObjectForEntityForName:@"Workout" inManagedObjectContext:self.managedObjectContext]; newWorkout.route = thisRoute; newWorkout.type = thisType; newWorkout.distance = thisDistance; newWorkout.time = thisTime; newWorkout.message = thisMessage; [self.workoutArray addObject:newWorkout]; //[self dismissModalViewControllerAnimated:YES]; } -(void)didCancelWorkout { [self dismissModalViewControllerAnimated:YES]; } -(void)dealloc { // [Speed release]; // [Calories release]; [route release]; [type release]; [distance release]; [time release]; [message release]; // [saveWorkout release]; // [cancelWorkout release]; [workoutArray release]; [managedObjectContext release]; [super dealloc]; } @end I'm trying to save details that I key on the screen (WorkoutViewController.xib) and I click the save button and get the above error. Thanks Stephen

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• XHR FF POST size limit

  - by usurper

  Hi, My XHR POST REQUEST is cut off. When I try to reload my page information is missing. Firebugs sends following message: ... Firebug request size limit has been reached by Firebug. ... My question is: What are my options? Would it work if I declare the content.length in the header? I added a line to my apache config file and restarted it: LimitRequestBody 0 I increased the size of transfer files in mysql config file Or it is a browser issue? The only solution I could think of was to cut the data in pieces and transmit the array one by one but I don't like this idea. The content length is 91691 according to firebug. Any suggestions?

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• Pre-allocate memory between HostApp and DLL

  - by Leo

  I have a DLL which provided a decoding function, as follows: function MyDecode (Source: PChar; SourceLen: Integer; var Dest: PChar; DestLen: Integer): Boolean; stdcall; The HostApp call "MyDecode", and transfer into the Source, SourceLen and Dest parameters, the DLL returns decoded Dest and DestLen. The problem is: The HostApp impossible to know decoded Dest length, and therefore would not know how to pre-allocated Dest's memory. I know that can split "MyDecode" into two functions: function GetDecodeLen (Source: PChar; SourceLen: Integer): Integer; stdcall; // Return the Dest's length function MyDecodeLen (Source: PChar; SourceLen: Integer; var Dest: PChar): Boolean; stdcall; But, My decoding process is very complicated, so if split into two functions will affect the efficiency. Is there a better solution?

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• when to use squid on server side?

  - by ajsie

  so i have set up apache serving my php pages. i read about squid but don't understand why/how i should use it to speed up my web server. from what i've learned squid is located in same network (or another) and caches content requested by the web browsers, and then when another web browser wants a same page, squid returns that page cached locally, so it never sends a request to the apache server (faster response time for the client, and reduced load for the server). so it seems that squid is for the client side (web browser), and has nothing to do with the server side (apache). but then some people tell others how they have speeded up apache using squid. so im confused. could squid be used on the server side too? and how will it work?

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• GNU ld removes section

  - by Jonatan

  I'm writing a boot script for an ARM-Cortex M3 based device. If I compile the assembler boot script and the C application code and then combine the object files and transfer them to my device everything works. However, if I use ar to create an archive (libboot.a) and combine that archive with the C application there is a problem: I've put the boot code in a section: .section .boot, "ax" .global _start _start: .word 0x10000800 /* Initial stack pointer (FIXME!) */ .word start .word nmi_handler .word hard_fault_handler ... etc ... I've found that ld strips this from the final binary (the section "boot" is not available). This is quite natural as there is no dependency on it that ld knows about, but it causes the device to not boot correctly. So my question is: what is the best way to force this code to be included?

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• Convert JSON String to Java Object or HashMap

  - by Priyank

  Hi. I am writing an android app. I want to pass some data across the intents/activities and I feel that a conversion to and from JSON is probably a more optimal way at this point. I am able to convert a java hashmap to a json string successfully using JSONObject support. However i need to convert back this JSON string to a java object or a hashmap. What is the best way to go about it. Is parcelable really a change worth doing; if I have simple 5 field object? What are the other ways to transfer data between intents. Cheers

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• Optimal Memory Configuration for Dell PowerEdge 1800 (Windows Server 2000 32bit)

  - by David Murdoch

  I am upgrading the memory on a Dell PowerEdge 1800 Server running Windows Server 2000 (32 bit). My Computer Properties currently reports "2,096,432 KB RAM" (4 modules @ 512MB each). Crucial.com scan reports: "Each memory slot can hold DDR2 PC2-5300 with a maximum of 2GB per slot. Maximum Memory Capacity:  12288MB Currently Installed Memory:  2GB Available Memory Slots:  2 Total Memory Slots:  6 Dual Channel Support:   No CPU Manufacturer:  GenuineIntel CPU Family:  Intel(R) Xeon(TM) CPU 2.80GHz Model 4, Stepping 1 CPU Speed:  2793 MHz Installed in pairs of modules." We will be completely replacing the old 512 MB modules. Will there be any performance difference between installing 4 modules @ 1GB vs. 2 modules @ 2GB?

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• Boot linux off hard drive and then switch to run from usb flash disk

  - by Jesse

  I have an older laptop that I want to use as a simple media server on my home network. I would like to avoid using the internal hard drive except for booting (BIOS does NOT support booting from USB). My thought was to mirror the hard drive (currently has current install of Arch Linux) onto the flash drive and then after booting switch over to run everything from the flash drive. I read the following article about using a RAM disk (HOW-TO: Boot OS into RAM for speed and silence) but ran into problem because the USB subsystem does not seem to be initialized soon enough (I create root and home paritions on the flash disk and modified fstab to pick those - didn't work). Any thoughts?

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• Difference between "traditional" COM and COM+ (in Component Services)

  - by kizzx2

  By the "traditional" way I mean registering the DLL in registry. There seems to be another method to set up it by going to mmc-Component Services-COM+ Applications and adding the .tlb file. I have a COM library that supports both methods. When it installs, it registers itself in the registry as a COM component and it works fine. However, when I added the .tlb file using the Component Services method, the behavior seems to be different and it starts giving out errors. I suspect it has something to do with marshaling and inter-process object transfer? (Sorry, I'm really a noob in the COM area) Can anyone point me to a good resource to clear my understanding?

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• How to burn a CD-ROM from a Mac for Solaris

  - by cope360

  I would like to burn a CD using a Mac (10.5) which I can then access from a Solaris 10 x86 machine. This partially works: Insert blank CD and let the Finder open it so it creates a "Recordable CD" window for it. Drag the files to be burned into the "Recordable CD" window Burn (there are no options except for speed) Then to mount in Solaris: mount -f hsfs -o ro /dev/dsk/foo /mnt/bar The problem here is that Solaris will see all the filenames as lower case and it will only allow each file name to contain one period (these are HSFS limitations). My guess is that the Mac is not burning the disc with the Rock Ridge extensions that allow for the full file names to be preserved. Is there some combination of burning tools/options and mount options that will make this work?

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• database on SSD: data only or the DBM program too?

  - by simone

  I plan on moving the data I use for statistical analysis (100-ish Gb) onto an SSD. The data is either sqlite single-file db's, or postgresql-managed data. The SSD is 240 Gb, 550 MB/s read and 520 MB/s write. Should I reserve that space for the data only, or would it be a good idea to install the operating system (Mac OS X) and the application directory (Adobe Suite, Microsoft Office and the like) on the SSD too? And would it make a substantial speed difference whether I also install the postgresql binaries on the SSD? I have plenty of other space (another 300Gb hard-drive, and a 1Tb one). Don't know the features of the non-SSD drives, though they're our standard equipment on all Macs, and they're definitely OK. Thanks.

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• W3 Total Cache or WP Super Cache?

  - by javipas

  I'm just preparing the setup of a new VPS where I will migrate a WordPress blog with a good traffic (currently, around 40k pageviews a day), and I was thinking about the caching strategy. I've found different ideas and recommendations, but from previous experiences I will setup a Nginx+PHP-FPM+MySQL (LEMP) system on a Linode VPS. I've read also about setting Nginx as a reverse proxy with Apache, and even using Varnish too, but I don't know if all of this can benefit the speed/performance of the blog (that's the only thing that will be installed on the VPS). The question now is... would you recommend W3 Total Cache or WP Super Cache? I've used W3 on some blogs, but I haven't noticed great benefits and don't need all its options, so I think I could give the veteran WP Super Cache a try. Besides, some users have complained about W3 complex configuration and lack of performance (even consumig more CPU) on some cases.

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• Streaming files from EventMachine handler?

  - by Noah

  I am creating a streaming eventmachine server. I'm concerned about avoiding blocking IO or doing anything else to muck up the event loop. From what I've read, ruby's non-blocking IO can be used to stream files in a non-blocking way, or I can call next_tick, but I'm a little unclear about which of these approaches is preferable. Part of the problem is that I have not found a good explanation of non-blocking IO library functions in ruby. Short version: Assuming a long-lived network IO operation, several wall clock minutes of streaming per file, transfer, what is the best way to do this in eventmachine without gumming up the event loop? while 1 do file.read do |bytes| @conn.send_data bytes end end I understand that the above code will block and I'm wondering what to put in its place. Also, I cannot use the FileStreamer class that is part of eventmachine as is, because I need to manipulate the data after it's read but before it's sent. Thanks, Noah

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• Connect ps/2->usb keyboard to linux?

  - by Daniel

  I have a lovely ancient ergonomic keyboard (no name SK - 6000) connected via a DIN-ps/2 adapter to a ps/2-usb adapter to my docking station. After Grub it stops working. It takes either suspending and waking up or replugging it while Linux is running to get it to work. No extra kernel modules get loaded for this. When it works and I restart without power off, it will work immediately. Even when it does not work, it is visible (lsusb device number varies but output is identical whether working or not): $ lsusb -v -s 001:006 Bus 001 Device 006: ID 0a81:0205 Chesen Electronics Corp. PS/2 Keyboard+Mouse Adapter Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 1.10 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x0a81 Chesen Electronics Corp. idProduct 0x0205 PS/2 Keyboard+Mouse Adapter bcdDevice 0.10 iManufacturer 1 CHESEN iProduct 2 PS2 to USB Converter iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 59 bNumInterfaces 2 bConfigurationValue 1 iConfiguration 2 PS2 to USB Converter bmAttributes 0xa0 (Bus Powered) Remote Wakeup MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 1 Boot Interface Subclass bInterfaceProtocol 1 Keyboard iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.10 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 64 Report Descriptors: ** UNAVAILABLE ** Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 1 Boot Interface Subclass bInterfaceProtocol 2 Mouse iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.10 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 148 Report Descriptors: ** UNAVAILABLE ** Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x82 EP 2 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 10 Device Status: 0x0000 (Bus Powered) $ ll -R /sys/bus/hid/drivers/ /sys/bus/hid/drivers/: total 0 drwxr-xr-x 2 root root 0 Jul 8 2012 generic-usb/ /sys/bus/hid/drivers/generic-usb: total 0 lrwxrwxrwx 1 root root 0 Jul 7 23:33 0003:046D:C03D.0003 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.2/1-1.2.2:1.0/0003:046D:C03D.0003/ lrwxrwxrwx 1 root root 0 Jul 7 23:33 0003:0A81:0205.0001 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/ lrwxrwxrwx 1 root root 0 Jul 7 23:33 0003:0A81:0205.0002 -> ../../../../devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.1/0003:0A81:0205.0002/ --w------- 1 root root 4096 Jul 7 23:32 bind lrwxrwxrwx 1 root root 0 Jul 7 23:33 module -> ../../../../module/usbhid/ --w------- 1 root root 4096 Jul 7 23:32 new_id --w------- 1 root root 4096 Jul 8 2012 uevent --w------- 1 root root 4096 Jul 7 23:32 unbind When replugging, dmesg shows this (which except for the 1st line and different input numbers already came at boot time): [ 1583.295385] usb 1-1.2.1: new low-speed USB device number 6 using ehci_hcd [ 1583.446514] input: CHESEN PS2 to USB Converter as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/input/input17 [ 1583.446817] generic-usb 0003:0A81:0205.0001: input,hidraw0: USB HID v1.10 Keyboard [CHESEN PS2 to USB Converter] on usb-0000:00:1a.0-1.2.1/input0 [ 1583.454764] input: CHESEN PS2 to USB Converter as /devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.1/input/input18 [ 1583.455534] generic-usb 0003:0A81:0205.0002: input,hidraw1: USB HID v1.10 Mouse [CHESEN PS2 to USB Converter] on usb-0000:00:1a.0-1.2.1/input1 [ 1583.455578] usbcore: registered new interface driver usbhid [ 1583.455584] usbhid: USB HID core driver So I tried $ sudo udevadm test /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/hidraw/hidraw0 run_command: calling: test adm_test: version 175 This program is for debugging only, it does not run any program, specified by a RUN key. It may show incorrect results, because some values may be different, or not available at a simulation run. parse_file: reading '/lib/udev/rules.d/40-crda.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-fuse.rules' as rules file ... parse_file: reading '/lib/udev/rules.d/40-usb-media-players.rules' as rules file parse_file: reading '/lib/udev/rules.d/40-usb_modeswitch.rules' as rules file ... parse_file: reading '/lib/udev/rules.d/42-qemu-usb.rules' as rules file ... parse_file: reading '/lib/udev/rules.d/69-cd-sensors.rules' as rules file add_rule: IMPORT found builtin 'usb_id', replacing /lib/udev/rules.d/69-cd-sensors.rules:76 ... parse_file: reading '/lib/udev/rules.d/77-mm-usb-device-blacklist.rules' as rules file ... parse_file: reading '/lib/udev/rules.d/85-usbmuxd.rules' as rules file ... parse_file: reading '/lib/udev/rules.d/95-upower-hid.rules' as rules file parse_file: reading '/lib/udev/rules.d/95-upower-wup.rules' as rules file parse_file: reading '/lib/udev/rules.d/97-bluetooth-hid2hci.rules' as rules file udev_rules_new: rules use 271500 bytes tokens (22625 * 12 bytes), 44331 bytes buffer udev_rules_new: temporary index used 76320 bytes (3816 * 20 bytes) udev_device_new_from_syspath: device 0x7f78a5e4d2d0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/hidraw/hidraw0' udev_device_new_from_syspath: device 0x7f78a5e5f820 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/hidraw/hidraw0' udev_device_read_db: device 0x7f78a5e5f820 filled with db file data udev_device_new_from_syspath: device 0x7f78a5e60270 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001' udev_device_new_from_syspath: device 0x7f78a5e609c0 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0' udev_device_new_from_syspath: device 0x7f78a5e61160 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1' udev_device_new_from_syspath: device 0x7f78a5e61960 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2' udev_device_new_from_syspath: device 0x7f78a5e62150 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1/1-1' udev_device_new_from_syspath: device 0x7f78a5e62940 has devpath '/devices/pci0000:00/0000:00:1a.0/usb1' udev_device_new_from_syspath: device 0x7f78a5e630f0 has devpath '/devices/pci0000:00/0000:00:1a.0' udev_device_new_from_syspath: device 0x7f78a5e638a0 has devpath '/devices/pci0000:00' udev_event_execute_rules: no node name set, will use kernel supplied name 'hidraw0' udev_node_add: creating device node '/dev/hidraw0', devnum=251:0, mode=0600, uid=0, gid=0 udev_node_mknod: preserve file '/dev/hidraw0', because it has correct dev_t udev_node_mknod: preserve permissions /dev/hidraw0, 020600, uid=0, gid=0 node_symlink: preserve already existing symlink '/dev/char/251:0' to '../hidraw0' udev_device_update_db: created empty file '/run/udev/data/c251:0' for '/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/hidraw/hidraw0' ACTION=add DEVNAME=/dev/hidraw0 DEVPATH=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/hidraw/hidraw0 MAJOR=251 MINOR=0 SUBSYSTEM=hidraw UDEV_LOG=6 USEC_INITIALIZED=969079051 The later lines sound like it's already there. And none of these awakes the keyboard: $ sudo udevadm trigger --verbose --sysname-match=usb* /sys/devices/pci0000:00/0000:00:1a.0/usb1 /sys/devices/pci0000:00/0000:00:1a.0/usbmon/usbmon1 /sys/devices/pci0000:00/0000:00:1d.0/usb2 /sys/devices/pci0000:00/0000:00:1d.0/usbmon/usbmon2 /sys/devices/virtual/usbmon/usbmon0 $ sudo udevadm trigger --verbose --sysname-match=hidraw0 /sys/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.2/1-1.2.1/1-1.2.1:1.0/0003:0A81:0205.0001/hidraw/hidraw0 $ sudo udevadm trigger I also tried this to no avail: # echo -n 0003:0A81:0205.0001 > /sys/bus/hid/drivers/generic-usb/bind ksh: echo: write to 1 failed [No such device] # echo -n 0003:0A81:0205.0001 > /sys/bus/hid/drivers/generic-usb/unbind # echo -n 0003:0A81:0205.0001 > /sys/bus/hid/drivers/generic-usb/bind # echo usb1 >/sys/bus/usb/drivers/usb/unbind # echo usb1 >/sys/bus/usb/drivers/usb/bind What else should I try to get the same result as replugging or suspending, by just issuing a command?

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