Windows 7 on Latitude E6400

No sir, I don't have any WWAN cards. I have tried disabling hardware to no avail. I have my BT (Dell Wireless 370), Card Reader (Ricoh?) and Serial, Parallel and eSATA ports permanently disabled via BIOS.

Thanks for replying.

 

quite honestly, i would try reinstalling the os (which are you using, btw?). if you don't want to do that, i would first make a ghost image or acronis image of the drive so you can revert back if it doesnt help.

it occurs to me that it is probably win7 since you are on this forum, but which architecture, and is it in fact win7?

 

I am using Windows Server 2008 R2 Standard x64... which shares its codebase with Windows 7.

EDIT: WOAH.

 

thats got to be a particular driver. what happens when you are in safe mode? that also seems like a system hang. thats a solid 14 seconds of dpc latency. does that repeat on an interval? also, have you checked your event viewer?

 

Yes, that was a system freeze. It happened when I tried to change ASIO4ALL settings in FL Studio. This is a reproducible phenomenon, more or less; it also happens when I try to switch between ASIO and DirectSound drivers.

How do I check which driver was at fault? Is this information available in the Event Viewer?

I don't get freezes in Safe Mode due to most drivers being disabled; I unfortunately cannot start the DPC Latency Checker in Safe Mode due to the same reason.

EDIT: A 15-20 second freeze happened again. I was just listening to Audio in Foobar (WASAPI output).

 

the only way to check what driver is at fault is to disable them manually (or using devcon). i would consider using devcon and writing a script to disable and reenable say half of your drivers, and then run it and watch the dpc latency checker's output. let me know if you need help doing that.

 

Yes, I will need help with that, because this is driving me nuts. I don't even know what devcon is; my closest guess is 'developer console'. Thanks a lot!

 

alright, here is devcon. (i attach it directly out of the win7 WinDDK) (note, this is the amd64 version of devcon. for those who are using 32bit, ask if you need it). the technet article on the syntax is :: http://technet.microsoft.com/en-us/library/cc776272(WS.10).aspx . the general overview of what the tool does is :: http://technet.microsoft.com/en-us/library/cc737393(WS.10).aspx

i would suggest going into the device manager and noting down all of the hardware ids. (go to device manager, right click a device, click properties, click the details tab, click the drop down and select hardware ids). the device specific id is the longest, although you can often use the shortened versions.

after you have written down all of these ids (into a notepad doc, for example), create a batch file (rename a .txt file to .bat). then you would have a command that says devcon.exe enable (or disable) "deviceid" you can either point directly to devcon, e.g., C:\users\user\desktop\devcon.exe, or alternatively (and i would suggest, you can add the directory to your system environment variable Path. to do this, type environment into the win search box, and click edit the environmental variables for your account. modify the path variable by adding ;directory\ to the string, and click okay.

once you have done this, write out the batch file with disable "device" "device" "device" etc, for each device. (i would also create an enable batch file as well with the same ids).

once you have done this, start running dpclat and then run the batch script. see how the latency is, and then reenable. if disabling works, narrow down the list until you've pinpointed the driver.

for more questions..... ask! (and feel free to rep me up if its useful )

 

I did rep your last post, but your rep power remained at 6. Weird.

I am setting new DPC latency records! This happened when I was watching an AVI in VLC.


I have started with devcon, but haven't caught the culprit yet. I'll keep you posted.

 

Does anyone know how to disable the Broadcom USH in the Bios? I don't have the fingerprint reader on my machine and I'm still receiving an exclamation point in device manager. I checked in the bios and TPM is not enabled. Thanks