I'm not sure if it helps, but I now found this in /var/log/syslog
May 2 01:23:40 laptop1104 kernel: [ 9122.079634] psmouse.c: GlidePoint at isa0060/serio1/input0 lost sync at byte 1
May 2 01:23:40 laptop1104 kernel: [ 9122.080465] psmouse.c: GlidePoint at isa0060/serio1/input0 lost sync at byte 1
May 2 01:23:40 laptop1104 kernel: [ 9122.081724] psmouse.c: GlidePoint at isa0060/serio1/input0 lost sync at byte 1
May 2 01:23:40 laptop1104 kernel: [ 9122.137656] psmouse.c: GlidePoint at isa0060/serio1/input0 lost sync at byte 1
May 2 01:23:40 laptop1104 kernel: [ 9122.138686] psmouse.c: GlidePoint at isa0060/serio1/input0 lost sync at byte 1
May 2 01:23:40 laptop1104 kernel: [ 9122.138693] psmouse.c: issuing reconnect request
I'm not sure if it helps, but I now found this in /var/log/syslog
May 2 01:23:40 laptop1104 kernel: [ 9122.079634] psmouse.c: GlidePoint at isa0060/ serio1/ input0 lost sync at byte 1 serio1/ input0 lost sync at byte 1 serio1/ input0 lost sync at byte 1 serio1/ input0 lost sync at byte 1 serio1/ input0 lost sync at byte 1
May 2 01:23:40 laptop1104 kernel: [ 9122.080465] psmouse.c: GlidePoint at isa0060/
May 2 01:23:40 laptop1104 kernel: [ 9122.081724] psmouse.c: GlidePoint at isa0060/
May 2 01:23:40 laptop1104 kernel: [ 9122.137656] psmouse.c: GlidePoint at isa0060/
May 2 01:23:40 laptop1104 kernel: [ 9122.138686] psmouse.c: GlidePoint at isa0060/
May 2 01:23:40 laptop1104 kernel: [ 9122.138693] psmouse.c: issuing reconnect request