The mouse is a USB mouse and indeed shares IRQ 11 with the WLAN card/CF
slot.
$ cat /proc/interrupts
CPU0
0: 34567058 XT-PIC-XT timer
1: 67903 XT-PIC-XT i8042
2: 0 XT-PIC-XT cascade
3: 4561463 XT-PIC-XT pcmcia1.0
4: 10 XT-PIC-XT
5: 2 XT-PIC-XT
7: 0 XT-PIC-XT parport0
9: 145199 XT-PIC-XT acpi
10: 2 XT-PIC-XT
11: 1897568 XT-PIC-XT uhci_hcd:usb1, uhci_hcd:usb2,
uhci_hcd:usb3, yenta, yenta, Intel 82801CA-ICH3, eth3
12: 48381 XT-PIC-XT i8042
14: 790664 XT-PIC-XT ata_piix
15: 0 XT-PIC-XT ata_piix
NMI: 0 Non-maskable interrupts
LOC: 0 Local timer interrupts
SPU: 0 Spurious interrupts
ERR: 0
MIS: 0
--
Mouse begins to drift left under heavy wifi load
https://bugs.launchpad.net/bugs/334957
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