System slowdown/freeze

Running Ubuntu 6.0.1 on an IBM ThinkCentre desktop machine.

PROBLEM: The display will frequently, (about once every other day)
freeze up; it seems to be on a random basis. I can invoke the
consoles (ALT 1 -7) but they take forever to respond...though I can't
see anything in TOP that indicates why this is. I end up doing: "~#
shutdown -r now". However, even if I do 'the Bad Thing' and turn off
the box, Ubu is very forgiving and doesn't force the user to read how
they are morons for not shutting down correctly.

The following is 'dmesg tail' after re-booting machine after it
froze. It doesnt have any pattern that I (an amateur) can discern
other than the relevance to ACPI. I disabled both, I thought, in the
BIOS. Could it be that Ubu is, unwittingly activating it? Could it
be? Or what?

gf@zeno:~$
[17179590.236000] sd 2:0:0:0: Attached scsi removable disk sdb
[17179590.236000] sd 2:0:0:0: Attached scsi generic sg2 type 0
[17179590.236000] usb-storage: device scan complete
[17179596.428000] CSLIP: code copyright 1989 Regents of the University
of Califo rnia
[17179596.436000] PPP generic driver version 2.4.2
[17179596.476000] NET: Registered protocol family 10
[17179596.476000] lo: Disabled Privacy Extensions
[17179596.476000] IPv6 over IPv4 tunneling driver
[17179596.608000] NET: Registered protocol family 24
[17179598.396000] ACPI: Power Button (FF) [PWRF]
[17179598.396000] ACPI: Power Button (CM) [PWRB]
[17179598.492000] ibm_acpi: ec object not found
[17179598.524000] pcc_acpi: loading...
[17179599.704000] ip_tables: (C) 2000-2002 Netfilter core team
[17179600.000000] Netfilter messages via NETLINK v0.30.
[17179600.488000] ip_conntrack version 2.4 (8059 buckets, 64472 max) -
232 bytes per conntrack
[17179604.392000] [drm] Initialized drm 1.0.1 20051102
[17179604.396000] ACPI: PCI Interrupt 0000:00:02.0[A] -> GSI 16
(level, low) -> IRQ 185
[17179604.396000] [drm] Initialized i915 1.4.0 20060119 on minor 0
[17179606.728000] ppdev: user-space parallel port driver
[17179607.136000] eth0: no IPv6 routers present
[17179716.768000] Inbound IN=ppp0 OUT= MAC= SRC=222.161.2.52
DST=216.237.108.22 LEN=921 TOS=0x00 PREC=0x00 TTL=42 ID=0 DF PROTO=UDP
SPT=44635 DPT=1027 LEN=901
gf@zeno:~$

TIA Zeno

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