> While it appears from your post everything is correct, please confirm > that the modem and mouse are using different IRQs. ttyS0/ttyS2 and > ttyS1/ttyS3 share IRQs. Since you only have this problem with X (which > activates the mouse) you probably have IRQ contention somewhere. > > Try installing GPM so you can use the mouse in a virtual terminal. If > the problem reproduces itself there as well, you will have confirmed the > IRQ contention.
cat /proc/interrupts might be a quicker/easier way to find out..
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