Comment 18 for bug 34501

I have seen this same problem on a new Dell XPS M1530 on which I installed Ubuntu 8.04RC. Everything appeared to work fine until I used the 'Mouse' preferences to attempt to change the mouse speed. Initially no effect, so I restarted X (ctrl-alt-backspace). After that the trackpad was uber-sensitive/touchy/jumpy and seemed to trigger spurious keystroke and/or mouse-clicks. Almost any attempt to move the pointer using the trackpad results in the mouse pointer flying to the bottom left and new GNOME panels being added to my desktop. I rebooted with Vista (installed in the factory) and no problems occur at all there, so it's not a hardware problem. I plugged in a USB mouse and it works fine (and in fact is the only way I can use the system currently).

Here is some output from dmesg:

[ 350.241284] printk: 5 messages suppressed.
[ 350.241298] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 363.508355] printk: 1 messages suppressed.
[ 363.508365] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 363.694021] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 363.844644] atkbd.c: Unknown key pressed (translated set 2, code 0x0 on isa0060/serio0).
[ 363.844655] atkbd.c: Use 'setkeycodes 00 <keycode>' to make it known.
[ 363.847526] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 363.937708] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 369.184504] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 369.206094] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 369.232839] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 369.252692] psmouse.c: Failed to reset mouse on isa0060/serio1
[ 369.256523] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 369.520942] printk: 2 messages suppressed.
[ 369.520954] atkbd.c: Spurious ACK on isa0060/serio0. Some program might be trying access hardware directly.
[ 372.429181] printk: 24 messages suppressed.
[ 372.429192] atkbd.c: Spurious NAK on isa0060/serio0. Some program might be trying access hardware directly.

Will perform full system update (synaptic) and see if that fixes things...