Device Drivers

Problem With OID_PNP_SET_POWER On Vista 5840
Hi! I'm trying to figure out and fix a problem we're seeing on multiple laptops (Dell, HP). When the laptop goes into hibernate, the NDIS NWF miniport driver gets the OID_PNP_SET_POWER set request and disables the device (e.g., disables interrupts, clears any interrupt events, etc.) and the laptop goes into ... 30 Nov 2006 17:30

MSVAD Virtual Audio Driver problem
Hi I want to have a virtual audio driver that sits behind a 3rd party application to 'intercept' the sound input/output. E.g. when that application plays sound, instead of going to the speaker, the audio stream would be captured and processed elsewhere. I may also pump in an audio stream to that application li... 1 Dec 2006 03:50

WdfUsbTargetPipeReadSynchronously and the Bytes Read Parm
All: I am using the WdfUsbTargetPipeReadSynchronously function to retrieve data from a bulk pipe. The data comes back fine, but the bytes read parm is all screwey. The board is a Cypress FX2 development board which an hardware engineer krufted together something that would blast back 512 bytes of data on the b... 28 Nov 2006 13:47

InitializePrintMonitor2
I have this and DllMain exposed properly in my code, but InitializePrintMonitor2 never is called. -- Code Snip -- BOOL APIENTRY DllMain(HINSTANCE hInst, DWORD dwReason, LPVOID lpReserved) { debug_log("DllMain()\n"); switch (dwReason) { case DLL_PROCESS_ATTACH: debug_log(" DLL_PROCESS_ATT... 21 Nov 2006 11:40

Multiple DMA transactions
Can I have multiple DMA transactions on the same DMA enabler? ie. only one DMA transaction happens at a time, but to avoid creating scatter gather lists, memory, etc. each DMA transaction remain in existence until the app exits. ... 18 Nov 2006 21:49

Help: installing WDK 5840 sample minispy
Hi, I install WDK 5840 and built the sample minispy. I copied the sys, exe and inf file to a directory and right-clicked the inf. I saw a flash of a dialog and then nothing. When I try to run minispy.exe, the following error occured: Connecting to filter's port... Could not connect to filter: 0x80070002 ... 16 Nov 2006 23:58

How to use IOCTL_USB_USER_REQUEST
I want to post USB request to our developing device. I found IOCTL_USB_USER_REQUEST in a DDK include file. It seems to be a control code for user mode applications which use system USB drivers. But Microsoft doesn't document the usage. Does anyone know how to use IOCTL_USB_USER_REQUEST and how to post USB re... 15 Nov 2006 20:24

Is WDK's sample Ramdisk a Filter driver?
Hi, I am a newbie in the area. By looking at the sample Ramdisk came with WDK, I am confused. Is it a bus driver? a filter driver? or a mini-filter driver? Would someone explain this a bit more details? Thanks in advance. ... 15 Nov 2006 20:55

EvtDeviceArmWakeFromSx not called
Hi I am writing a KMDF driver for a USB device that is remote wakeup capable. But EvtDeviceArmWakeFromSx is never called when I go to standby. I have registered EvtDeviceArmWakeFromS0, EvtDeviceDisarmWakeFromS0 , EvtDeviceWakeFromS0Triggered, EvtDeviceArmWakeFromSx ,EvtDeviceDisarmWakeFromSx , EvtDeviceW... 13 Dec 2006 15:41

How to send IOCTLs to a filter driver KB uses wrong mutex?
The microsoft KB on "How to send IOCTLs to a filter driver" http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q262305 uses a FastMutex to synchronize creation and deletion of control objects. The documentation for ExAcquireFastMutexUnsafe says: ExAcquireFastMutexUnsafe can be safely called only at IRQL = A... 13 Nov 2006 23:56