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samsung or android device causing crash?

I've been having occasional lock ups.
The screen will blank out like X has crashed and I see a tty login, 
but still see a mouse pointer, but can not type to login, and the 
mouse pointer will be stuck.
Can't get any input to machine with keyboard (like to switch to another
tty even), etc., so I reset or do a hard shutdown and reboot.

I dig into dmesg, and the only common thread I'm seeing is that it
happens when my Samsung Galaxy is plugged into the machine to recharge
I'll see something about a new usb device connecting, and unable to
enumerate device, or some such thing.
I really have a hard time making sense of dmesg, anyway.
Mostly I think I'm just seeing what happens when I reboot the machine, 
locating drives, usb controller, blah blah.
I don't see anything that says "error", and there are no human-readable
time signatures...Perhaps I'm misinterpreting what I'm seeing.
The usb connection to the phone is so iffy and/or fickle, I remove the sdcard and
use a cardreader to transfer stuff.
Sometimes it beeps like it's freshly connected just bumping the table
(loose cord thing), incessantly. So, I'm wondering if it's the phone causing the problems.

If it isn't, I'd like to know how to better diagnose this matter.

I'm running Squeeze, updated generally a couple of times/month,
on AMD64, 4x2.8ghz, with 16gb ram.

all tony, all the time!

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