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| Hardware and Windows Vista Hardware issues in relation to Windows Vista. (microsoft.public.windows.vista.hardware_devices) |
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September 27th 09, 02:20 PM
posted to microsoft.public.windows.vista.hardware_devices
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Audio/video problems & workaround (excessive delay/latency)
Windows XP SP3 System
Some time ago, I started having problems with video and audio playback. Odd pauses/glitches in either or both was more or less the problem. Other less definable problems & delay may or may not also relate to this driver. I recently ran across a program (dpclat.exe) that measures DPC latency. The program showed the problem and the results of disabling the Microsoft USB composite device driver. (4000us DPC latency or more) The USB Mass storage driver and Epson's built in memory card reader (USB) were also responsible for approximately 4000us DPC latency. Viewscan and Windows document scan and the Windows scan wizard use the composite driver, Epson's scan software does not. My Epson Workforce 600 (all in one) is connected via it's LAN port to my router. An HP3970 Scanner is also connected via USB to this P/C. Other web references seem to indicate that it is likely that the Epson software that works with the composite driver is the culprit, although the composite driver is a player as well. usbccgp.sys ver 5.1.2600.5512 (xpsp.080413-2107) Anyone else with a similar problem?? Any known cures? (Hotfixes?) (Other than disabling usbccgp.sys) 
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September 27th 09, 02:51 PM
posted to microsoft.public.windows.vista.hardware_devices
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Audio/video problems & workaround (excessive delay/latency)
Oops! Fat fingers and wrong group. Apology tendered.
"Chuck" wrote in message ... Windows XP SP3 System Some time ago, I started having problems with video and audio playback. Odd pauses/glitches in either or both was more or less the problem. Other less definable problems & delay may or may not also relate to this driver. I recently ran across a program (dpclat.exe) that measures DPC latency. The program showed the problem and the results of disabling the Microsoft USB composite device driver. (4000us DPC latency or more) The USB Mass storage driver and Epson's built in memory card reader (USB) were also responsible for approximately 4000us DPC latency. Viewscan and Windows document scan and the Windows scan wizard use the composite driver, Epson's scan software does not. My Epson Workforce 600 (all in one) is connected via it's LAN port to my router. An HP3970 Scanner is also connected via USB to this P/C. Other web references seem to indicate that it is likely that the Epson software that works with the composite driver is the culprit, although the composite driver is a player as well. usbccgp.sys ver 5.1.2600.5512 (xpsp.080413-2107) Anyone else with a similar problem?? Any known cures? (Hotfixes?) (Other than disabling usbccgp.sys)
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