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Aspire - "STOP 000000c2" BSOD when disconnecting usb modem

post #1 of 9
7/27/06 at 12:08am
Thread Starter 
Hi people

I've an Aspire 1640 laptop. Internet connectivity is through an ADSL modem connected to USB. The same ADSL modem also works with Ethernet, but that cable is currently used by another computer so USB's the only option to avoid constantly switching cables between computers.

The link itself works perfectly, but whenever the USB cable is removed from the computer or if the modem is switched off, a blue screen follows a few seconds later. Usual message is Bad_Pool_Caller with STOP 000000c2.

OS is XP Home, with all the latest patches. One of them (sorry, can't remember exactly which - a Genuine Advantage hotfix, I think) stopped apparently random blue screens when surfing, but nothing's changed the BSOD on disconnection.

Does anyway have similar experience of this with an Acer laptop? I suspect that the USB driver for the modem itself might be at fault (Huawei MT882), so it might not be related to the laptop at all. Then again, maybe it's Acer's USB drivers... Could be other things, too, so I'm trying to reduce the list of possible suspects.

Many thanks
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post #2 of 9
7/27/06 at 5:43am
http://support.microsoft.com/kb/q265879/ makes a good read on this error analysis
have u tried on another usb port?

cheers ...
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post #3 of 9
7/27/06 at 10:04am
Thread Starter 
Thanks for the suggestions. I saw that MS page a while ago but it was Greek to me. I persevered this time, but the only additional info it provides is that the first error code (00000007) is an "Attempt to free a pool that was already freed". In my case, I guess "freed" means disconnected. There's nothing specific about the other codes and nothing much that could be googled (I tried). MS doesn't have a clue with the Minidump, of course.

Seems to me that either the Acer USB driver or the modem USB driver still thinks it's connected, and when it receives no answer goes haywire.

Same problem with other USB ports. I'm loathe to trigger the error again on another port; grabbing the full error codes just now also wiped half my Mozilla settings (still, a fresh install never hurt anyone, especially with backups to hand...)

Just wanted to have an idea whether anyone else was experiencing similar crashes. Thanks.
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post #4 of 9
7/27/06 at 10:23am
how about trying to activate XP quick device removal (safely remove hardware), unless u r using this option before removing the device. also de-activate the option "allow the system to deactivate for saving power"

cheers ...
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post #5 of 9
7/27/06 at 10:39am
Thread Starter 
Problem is that XP doesn't let me deactivate the connection ("may be using protocols that don't support plug and play, may have been started by another user" etc). Thanks for reminder though - may have something to do with the "always on" network settings - I'll have a root around. It's not a problem with the protocols incidentally; only QoS and TCP/IP on that connection.
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post #6 of 9
7/27/06 at 10:50am
Thread Starter 
Just occurred to me that it might be the firewall (Sygate Personal Edition 5.6 build 2808) - it likes writing to the disk every few seconds; it might not like the missing connection. I'll try disabling it before pulling the plug and shall post back the results.
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post #7 of 9
7/27/06 at 11:10am
Thread Starter 
The firewall it is, I think. The computer didn't crash after disabling Sygate before I pulled the cable, but on rebooting Sygate crashed quite horribly, taking XP down with it.

Perhaps it's time I started looking for another free firewall (no thanks to Symantec for burying what had been an excellent freebie).

Thanks for your help, qhn.
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post #8 of 9
7/27/06 at 11:14am
glad to hear that it worked!
symantec is always too bloated (for me anyway). i use ZA free version since day one and really having no issue at all, coupling with avast (freeware), i am being very lucky (knock on wood)

cheers ...
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post #9 of 9
7/27/06 at 11:48am
Thread Starter 
I agree with you about anything with Symantec stamped on it being bloated. And I really dislike companies who buy other companies just to kill competing (and usually better) products. The worst is Norton AV hosing entire systems - no idea how they managed to keep their market dominance. Sygate's firewall was nicely slim, light on resources, but the constant disk accessing prevents computers being put to sleep and now it also seems to cause those disconnection crashes.

Never liked ZA however - was a resource hog last time I tried, and also seemed to let a lot of dubious traffic through with no advanced options for blocking (free edition anyways). Am considering Comodo or Core Force as a replacement, though Sygate will still probably do the trick for a good while yet. So long as I don't pull out the cable...

Thanks again.
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