The screen still dims, and the ACPI issues seem to persist.  Here's my latest
'dmesg' output.  Is this the latest 'linux-K8' kernel?  Thanks.
root@ubuntu:/home/gene # dmesg
Bootdata ok (command line is root=/dev/hda1 ro console=tty0 quiet splash)
Linux version 2.6.10-3-amd64-k8 (buildd@yellow) (gcc version 3.3.5 (Debian
1:3.3.5-8ubuntu2)) #1 Tue Feb 15 09:41:07 UTC 2005
BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 000000000009f800 (usable)
 BIOS-e820: 000000000009f800 - 00000000000a0000 (reserved)
 BIOS-e820: 00000000000d8000 - 0000000000100000 (reserved)
 BIOS-e820: 0000000000100000 - 000000001fef0000 (usable)
 BIOS-e820: 000000001fef0000 - 000000001fefb000 (ACPI data)
 BIOS-e820: 000000001fefb000 - 000000001ff00000 (ACPI NVS)
 BIOS-e820: 000000001ff00000 - 0000000020000000 (reserved)
 BIOS-e820: 00000000fffe0000 - 0000000100000000 (reserved)
No mptable found.
On node 0 totalpages: 130800
  DMA zone: 4096 pages, LIFO batch:1
  Normal zone: 126704 pages, LIFO batch:16
  HighMem zone: 0 pages, LIFO batch:1
ACPI: RSDP (v000 PTLTD                                 ) @ 0x00000000000f8280
ACPI: RSDT (v001 Arima  161Fh    0x06040000  LTP 0x00000000) @ 0x000000001fef6b6e
ACPI: FADT (v001 Arima  161Fh    0x06040000 PTL_ 0x000f4240) @ 0x000000001fefae66
ACPI: SSDT (v001 PTLTD  POWERNOW 0x06040000  LTP 0x00000001) @ 0x000000001fefaeda
ACPI: MADT (v001 PTLTD           APIC   0x06040000  LTP 0x00000000) @
0x000000001fefafb0
ACPI: DSDT (v001  Arima 161Fh    0x06040000 MSFT 0x0100000e) @ 0x0000000000000000
ACPI: Local APIC address 0xfee00000
ACPI: LAPIC (acpi_id[0x00] lapic_id[0x00] enabled)
Processor #0 15:4 APIC version 16
ACPI: LAPIC_NMI (acpi_id[0x00] high edge lint[0x1])
ACPI: IOAPIC (id[0x01] address[0xfec00000] gsi_base[0])
IOAPIC[0]: apic_id 1, version 3, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 high edge)
ACPI: IRQ0 used by override.
ACPI: IRQ2 used by override.
ACPI: IRQ10 used by override.
Setting APIC routing to flat
Using ACPI (MADT) for SMP configuration information
Checking aperture...
CPU 0: aperture @ e0000000 size 256 MB
Built 1 zonelists
Kernel command line: root=/dev/hda1 ro console=tty0 quiet splash
Initializing CPU#0
PID hash table entries: 2048 (order: 11, 65536 bytes)
time.c: Using 1.193182 MHz PIT timer.
time.c: Detected 2004.609 MHz processor.
Console: colour VGA+ 80x25
Dentry cache hash table entries: 65536 (order: 7, 524288 bytes)
Inode-cache hash table entries: 32768 (order: 6, 262144 bytes)
Memory: 507040k/523200k available (1769k kernel code, 15508k reserved, 1004k
data, 148k init)
Calibrating delay loop... 3948.54 BogoMIPS (lpj=1974272)
Security Framework v1.0.0 initialized
SELinux:  Disabled at boot.
Mount-cache hash table entries: 256 (order: 0, 4096 bytes)
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64 bytes/line)
CPU: L2 Cache: 1024K (64 bytes/line)
CPU: Mobile AMD Athlon(tm) 64 Processor 3200+ stepping 0a
ACPI: Looking for DSDT in initrd... not found!
Using local APIC NMI watchdog using perfctr0
Using local APIC timer interrupts.
Detected 12.528 MHz APIC timer.
checking if image is initramfs...it isn't (bad gzip magic numbers); looks like
an initrd
NET: Registered protocol family 16
PCI: Using configuration type 1
mtrr: v2.0 (20020519)
ACPI: Subsystem revision 20050125
ACPI: Interpreter enabled
ACPI: Using IOAPIC for interrupt routing
ACPI: PCI Root Bridge [PCI0] (00:00)
PCI: Probing PCI hardware (bus 00)
PCI: Via IRQ fixup
ACPI: PCI Interrupt Routing Table [\_SB_.PCI0._PRT]
ACPI: PCI Interrupt Link [ALKA] (IRQs 16 17 18 19 20 21 22 23) *9, disabled.
ACPI: PCI Interrupt Link [ALKB] (IRQs 23) *11, disabled.
ACPI: PCI Interrupt Link [ALKC] (IRQs 22) *10, disabled.
ACPI: PCI Interrupt Link [ALKD] (IRQs 21) *10, disabled.
ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 7 *9 12 14 15)
ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 7 10 *11 12 14 15)
ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 5 7 11 12 14 15) *10
ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 7 9 *10 11 12 14 15)
ACPI: Embedded Controller [EC] (gpe 1)
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI init
pnp: PnP ACPI: found 8 devices
usbcore: registered new driver usbfs
usbcore: registered new driver hub
PCI: Using ACPI for IRQ routing
** PCI interrupts are no longer routed automatically.  If this
** causes a device to stop working, it is probably because the
** driver failed to call pci_enable_device().  As a temporary
** workaround, the "pci=routeirq" argument restores the old
** behavior.  If this argument makes the device work again,
** please email the output of "lspci" to <email address hidden>
** so I can fix the driver.
agpgart: Detected AGP bridge 0
agpgart: Maximum main memory to use for agp memory: 438M
agpgart: AGP aperture is 256M @ 0xe0000000
PCI-DMA: Disabling IOMMU.
pnp: 00:05: ioport range 0x4d0-0x4d1 has been reserved
pnp: 00:05: ioport range 0xf510-0xf511 could not be reserved
pnp: 00:05: ioport range 0xf500-0xf500 has been reserved
pnp: 00:05: ioport range 0x4000-0x407f could not be reserved
pnp: 00:05: ioport range 0x8100-0x811f has been reserved
IA32 emulation $Id: sys_ia32.c,v 1.32 2002/03/24 13:02:28 ak Exp $
audit: initializing netlink socket (disabled)
audit(1108497042.178:0): initialized
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
devfs: 2004-01-31 Richard Gooch (<email address hidden>)
devfs: boot_options: 0x0
Initializing Cryptographic API
inotify device minor=63
Linux agpgart interface v0.100 (c) Dave Jones
[drm] Initialized drm 1.0.0 20040925
serio: i8042 AUX port at 0x60,0x64 irq 12
serio: i8042 KBD port at 0x60,0x64 irq 1
Serial: 8250/16550 driver $Revision: 1.90 $ 48 ports, IRQ sharing enabled
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 65536K size 1024 blocksize
input: AT Translated Set 2 keyboard on isa0060/serio0
NET: Registered protocol family 2
IP: routing cache hash table of 4096 buckets, 32Kbytes
TCP: Hash tables configured (established 32768 bind 32768)
NET: Registered protocol family 8
NET: Registered protocol family 20
Restarting tasks...<6> Strange, khubd not stopped
 Strange, kswapd0 not stopped
 Strange, kseriod not stopped
 done
ACPI wakeup devices:
SLPB  LID PCI0 PS2K USB1 USB2 USB3 Z00A CRD0 NICD
ACPI: (supports S0 S3 S4 S5)
RAMDISK: cramfs filesystem found at block 0
RAMDISK: Loading 4212KiB [1 disk] into ram disk... done.
VFS: Mounted root (cramfs filesystem) readonly.
Freeing unused kernel memory: 148k freed
ACPI: CPU0 (power states: C1[C1] C2[C2])
NET: Registered protocol family 1
Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
VP_IDE: IDE controller at PCI slot 0000:00:11.1
ACPI: PCI Interrupt Link [ALKA] disabled and referenced, BIOS bug.
ACPI: PCI Interrupt Link [ALKA] BIOS reported IRQ 0, using IRQ 23
ACPI: PCI Interrupt Link [ALKA] enabled at IRQ 23
ACPI: PCI interrupt 0000:00:11.1[A] -> GSI 23 (level, low) -> IRQ 23
VP_IDE: chipset revision 6
VP_IDE: not 100% native mode: will probe irqs later
VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci0000:00:11.1
    ide0: BM-DMA at 0x1ce0-0x1ce7, BIOS settings: hda:DMA, hdb:pio
    ide1: BM-DMA at 0x1ce8-0x1cef, BIOS settings: hdc:DMA, hdd:pio
Probing IDE interface ide0...
hda: SAMSUNG MP0402H, ATA DISK drive
elevator: using anticipatory as default io scheduler
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: max request size: 1024KiB
hda: 78242976 sectors (40060 MB) w/8192KiB Cache, CHS=16383/255/63, UDMA(100)
hda: cache flushes supported
 /dev/ide/host0/bus0/target0/lun0: p1 p2 < p5 >
Probing IDE interface ide1...
hdc: HL-DT-ST DVD-RW GWA-4080N, ATAPI CD/DVD-ROM drive
ide1 at 0x170-0x177,0x376 on irq 15
Probing IDE interface ide2...
Probing IDE interface ide3...
Probing IDE interface ide4...
Probing IDE interface ide5...
kjournald starting.  Commit interval 5 seconds
EXT3-fs: mounted filesystem with ordered data mode.
Adding 1485972k swap on /dev/hda5.  Priority:-1 extents:1
EXT3 FS on hda1, internal journal
hdc: ATAPI 24X DVD-ROM DVD-R CD-R/RW drive, 2048kB Cache
Uniform CD-ROM driver Revision: 3.20
lp: driver loaded but no devices found
mice: PS/2 mouse device common for all mice
Synaptics Touchpad, model: 1
 Firmware: 5.9
 Sensor: 35
 new absolute packet format
 Touchpad has extended capability bits
 -> multifinger detection
 -> palm detection
input: SynPS/2 Synaptics TouchPad on isa0060/serio1
Real Time Clock Driver v1.12
ieee1394: Initialized config rom entry `ip1394'
SCSI subsystem initialized
sbp2: $Rev: 1219 $ Ben Collins <email address hidden>
ts: Compaq touchscreen protocol output
Capability LSM initialized
device-mapper: 4.3.0-ioctl (2004-09-30) initialised: <email address hidden>
md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27
cdrom: open failed.
input: PC Speaker
Linux Kernel Card Services
  options:  [pci] [cardbus] [pm]
ACPI: PCI interrupt 0000:00:0a.0[A] -> GSI 17 (level, low) -> IRQ 17
Yenta: CardBus bridge found at 0000:00:0a.0 [161f:2032]
Yenta: Using CSCINT to route CSC interrupts to PCI
Yenta: Routing CardBus interrupts to PCI
Yenta TI: socket 0000:00:0a.0, mfunc 0x01001002, devctl 0x44
Yenta: ISA IRQ mask 0x0020, PCI irq 17
Socket status: 30000006
ath_hal: module license 'Proprietary' taints kernel.
ath_hal: 0.9.12.14 (AR5210, AR5211, AR5212)
wlan: 0.8.4.5 (EXPERIMENTAL)
ath_rate_onoe: 1.0
ath_pci: 0.9.4.12 (EXPERIMENTAL)
ACPI: PCI interrupt 0000:00:0c.0[A] -> GSI 18 (level, low) -> IRQ 18
ath0: 11a rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: 11b rates: 1Mbps 2Mbps 5.5Mbps 11Mbps
ath0: 11g rates: 1Mbps 2Mbps 5.5Mbps 11Mbps 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps
36Mbps 48Mbps 54Mbps
ath0: turbo rates: 6Mbps 9Mbps 12Mbps 18Mbps 24Mbps 36Mbps 48Mbps 54Mbps
ath0: mac 5.9 phy 4.3 radio 3.6
ath0: 802.11 address: 00:0b:6b:33:0a:62
ath0: Use hw queue 0 for WME_AC_BE traffic
ath0: Use hw queue 1 for WME_AC_BK traffic
ath0: Use hw queue 2 for WME_AC_VI traffic
ath0: Use hw queue 3 for WME_AC_VO traffic
ath0: Atheros 5212: mem=0xd0000000, irq=18
USB Universal Host Controller Interface driver v2.2
ACPI: PCI Interrupt Link [ALKD] disabled and referenced, BIOS bug.
ACPI: PCI Interrupt Link [ALKD] BIOS reported IRQ 0, using IRQ 21
ACPI: PCI Interrupt Link [ALKD] enabled at IRQ 21
ACPI: PCI interrupt 0000:00:10.0[A] -> GSI 21 (level, low) -> IRQ 21
uhci_hcd 0000:00:10.0: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller
uhci_hcd 0000:00:10.0: irq 21, io base 0x1c80
uhci_hcd 0000:00:10.0: new USB bus registered, assigned bus number 1
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ACPI: PCI interrupt 0000:00:10.1[B] -> GSI 21 (level, low) -> IRQ 21
uhci_hcd 0000:00:10.1: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (#2)
uhci_hcd 0000:00:10.1: irq 21, io base 0x1ca0
uhci_hcd 0000:00:10.1: new USB bus registered, assigned bus number 2
hub 2-0:1.0: USB hub found
hub 2-0:1.0: 2 ports detected
ACPI: PCI interrupt 0000:00:10.2[C] -> GSI 21 (level, low) -> IRQ 21
uhci_hcd 0000:00:10.2: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (#3)
uhci_hcd 0000:00:10.2: irq 21, io base 0x1cc0
uhci_hcd 0000:00:10.2: new USB bus registered, assigned bus number 3
hub 3-0:1.0: USB hub found
hub 3-0:1.0: 2 ports detected
ACPI: PCI interrupt 0000:00:10.3[D] -> GSI 21 (level, low) -> IRQ 21
ehci_hcd 0000:00:10.3: VIA Technologies, Inc. USB 2.0
ehci_hcd 0000:00:10.3: irq 21, pci mem 0xd0010800
ehci_hcd 0000:00:10.3: new USB bus registered, assigned bus number 4
ehci_hcd 0000:00:10.3: USB 2.0 initialized, EHCI 1.00, driver 26 Oct 2004
hub 4-0:1.0: USB hub found
hub 4-0:1.0: 6 ports detected
ACPI: PCI Interrupt Link [ALKC] disabled and referenced, BIOS bug.
ACPI: PCI Interrupt Link [ALKC] BIOS reported IRQ 0, using IRQ 22
ACPI: PCI Interrupt Link [ALKC] enabled at IRQ 22
ACPI: PCI interrupt 0000:00:11.5[C] -> GSI 22 (level, low) -> IRQ 22
PCI: Setting latency timer of device 0000:00:11.5 to 64
via-rhine.c:v1.10-LK1.2.0-2.6 June-10-2004 Written by Donald Becker
ACPI: PCI Interrupt Link [ALKB] disabled and referenced, BIOS bug.
ACPI: PCI Interrupt Link [ALKB] BIOS reported IRQ 0, using IRQ 23
ACPI: PCI Interrupt Link [ALKB] enabled at IRQ 23
ACPI: PCI interrupt 0000:00:12.0[A] -> GSI 23 (level, low) -> IRQ 23
eth0: VIA Rhine II at 0x1800, 00:03:25:13:d2:54, IRQ 23.
eth0: MII PHY found at address 1, status 0x7849 advertising 05e1 Link 0000.
ohci1394: $Rev: 1223 $ Ben Collins <email address hidden>
ACPI: PCI interrupt 0000:00:13.0[A] -> GSI 19 (level, low) -> IRQ 19
ohci1394: fw-host0: OHCI-1394 1.0 (PCI): IRQ=[19]  MMIO=[d0010000-d00107ff]  Max
Packet=[2048]
ieee1394: Host added: ID:BUS[0-00:1023]  GUID[000325212900de62]
NET: Registered protocol family 17
ACPI: AC Adapter [AC] (on-line)
ACPI: Battery Slot [BAT0] (battery present)
ACPI: Power Button (FF) [PWRF]
ACPI: Sleep Button (CM) [SLPB]
ACPI: Lid Switch [LID]
ibm_acpi: ec object not found
ACPI: Video Device [VGA] (multi-head: yes  rom: no  post: no)
powernow-k8: Found 1 AMD Athlon 64 / Opteron processors (version 1.00.09e)
powernow-k8:    0 : fid 0xc (2000 MHz), vid 0x6 (1400 mV)
powernow-k8:    1 : fid 0x8 (1600 MHz), vid 0xe (1200 mV)
powernow-k8:    2 : fid 0x0 (800 MHz), vid 0x18 (950 mV)
cpu_init done, current fid 0xc, vid 0x6
NET: Registered protocol family 10
Disabled Privacy Extensions on device ffffffff8037e220(lo)
IPv6 over IPv4 tunneling driver
ath0: no IPv6 routers present