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Obviously usb system thinks mouse is still there (it didn't see it removed)
so keeps trying to do something with it.
Simple work around - always remove usb mouse *before* suspending.

I do not know if this is something that can be fixed (how can system know
about hardware changes while it is suspended - test for devices after

Laptop Dell 3500 running latest 4-stable.
Abbreviated output from last crash.

IdlePTD at phsyical address 0x0049c000
initial pcb at physical address 0x003d3040
panicstr: Removing other than first element
panic messages:
Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x70
fault code              = supervisor read, page not present
instruction pointer     = 0x8:0xc0192720
stack pointer           = 0x10:0xc037c28c
frame pointer           = 0x10:0xc037c2b0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = Idle
interrupt mask          = net tty bio cam 
panic: from debugger
panic: from debugger
Uptime: 1h28m12s

#0  dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
487             if (dumping++) {
(kgdb) where
#0  dumpsys () at /usr/src/sys/kern/kern_shutdown.c:487
#1  0xc018e6d3 in boot (howto=256) at /usr/src/sys/kern/kern_shutdown.c:316
#2  0xc018eb11 in panic (fmt=0xc035f740 "Removing other than first element")
    at /usr/src/sys/kern/kern_shutdown.c:595
#3  0xc02a79c4 in usb_transfer_complete (xfer=0xc169f300)
    at /usr/src/sys/dev/usb/usbdi.c:823
#4  0xc02a1c03 in uhci_idone (ii=0xc1158040)
    at /usr/src/sys/dev/usb/uhci.c:1159
#5  0xc02a1adc in uhci_check_intr (sc=0xc114a000, ii=0xc1158040)
    at /usr/src/sys/dev/usb/uhci.c:1053
#6  0xc02a1a47 in uhci_intr (arg=0xc114a000) at
#7  0x282576da in ?? ()
#8  0x28257381 in ?? ()


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