Hello,
I have red hat 9 installed on a Compaq Evo N800v laptop.
I've just upgraded kernel to 2.4.22 an decided to activate acpi, because with apm I had no ideia about the battery status, and I wanted to use the lid buuton to turn off the screen.
I followed all the steps indicated on acpi.sourceforge.net (patch acpi, patch dsdt and apply evo n800v dsdt). The n800v dsdt I used was downloaded from acpi.sourceforge.net dsdts download page.

Now I have battery info, cpu status and throttling (this last I didn't tried yet), lid and power button control, power resource info and ac adapter info.
I don't have fan and thermal zone info/control and I get some acpi error messages on boot time.

Do you think it may be a problem with the n800v dsdt file ? Or some bad configuration of ACPI ? Here is my dmesg (I am not shure if dmesg is complete, I think that there should be more messages on top):

ACPI: PCI Interrupt Routing Table [\_SB_.C03C.C04E._PRT]
ACPI: Embedded Controller [C0D0] (gpe 29)
schedule_task(): keventd has not started
ACPI: Power Resource [C141] (off)
ACPI: Power Resource [C155] (off)
ACPI: Power Resource [C159] (off)
ACPI: Power Resource [C15D] (off)
ACPI: Power Resource [C166] (on)
ACPI: PCI Interrupt Link [C0B6] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [C0B7] (IRQs *5 10 11)
ACPI: PCI Interrupt Link [C0B8] (IRQs 5 10 11)
ACPI: PCI Interrupt Link [C0B9] (IRQs 5 10 *11)
ACPI: PCI Interrupt Link [C0BA] (IRQs 5 *10 11)
ACPI: PCI Interrupt Link [C0BB] (IRQs)
ACPI: PCI Interrupt Link [C0BC] (IRQs)
ACPI: PCI Interrupt Link [C0BD] (IRQs)
ACPI: Power Resource [C0CF] (on)
ACPI-0352: *** Error: Looking up [C1B5] in namespace, AE_NOT_FOUND
search_node c12d06c0 start_node c12d06c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D5._STA] (Node c12d06c0), AE_NOT_FOUND
ACPI-0352: *** Error: Looking up [C1B6] in namespace, AE_NOT_FOUND
search_node c12d07c0 start_node c12d07c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D6._STA] (Node c12d07c0), AE_NOT_FOUND
ACPI-0352: *** Error: Looking up [C1B7] in namespace, AE_NOT_FOUND
search_node c12d08c0 start_node c12d08c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D7._STA] (Node c12d08c0), AE_NOT_FOUND
ACPI-0352: *** Error: Looking up [C1B8] in namespace, AE_NOT_FOUND
search_node c12d09c0 start_node c12d09c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D8._STA] (Node c12d09c0), AE_NOT_FOUND
PCI: Probing PCI hardware
ACPI: PCI Interrupt Link [C0B8] enabled at IRQ 5
ACPI: PCI Interrupt Link [C0B7] enabled at IRQ 5
ACPI: PCI Interrupt Link [C0B6] enabled at IRQ 11
ACPI: PCI Interrupt Link [C0B9] enabled at IRQ 11
ACPI: PCI Interrupt Link [C0BA] enabled at IRQ 10
PCI: Using ACPI for IRQ routing
PCI: if you experience problems, try using option 'pci=noacpi' or even 'acpi=off'
isapnp: Scanning for PnP cards...
isapnp: No Plug & Play device found
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
VFS: Disk quotas vdquot_6.5.1
ACPI: AC Adapter [ACAD] (on-line)
ACPI: Battery Slot [BAT0] (battery present)
ACPI: Battery Slot [BAT1] (battery absent)
ACPI: Power Button (FF) [PWRF]
ACPI: Sleep Button (CM) [C11F]
ACPI: Lid Switch [LID]
ACPI: Processor [C000] (supports C1 C2 C3, 2 performance states, 8 throttling states)
ACPI-0352: *** Error: Looking up [C1B4] in namespace, AE_NOT_FOUND
search_node c12d05c0 start_node c12d05c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D3] (Node c12d05c0), AE_NOT_FOUND
ACPI-1120: *** Error: Method execution failed [\_TZ_.TZ1_._TMP] (Node cfeff400), AE_NOT_FOUND
ACPI-0352: *** Error: Looking up [C1B4] in namespace, AE_NOT_FOUND
search_node c12d05c0 start_node c12d05c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D3] (Node c12d05c0), AE_NOT_FOUND
ACPI-1120: *** Error: Method execution failed [\_TZ_.TZ2_._TMP] (Node cfeff5c0), AE_NOT_FOUND
ACPI-0352: *** Error: Looking up [C1B4] in namespace, AE_NOT_FOUND
search_node c12d05c0 start_node c12d05c0 return_node 00000000
ACPI-1120: *** Error: Method execution failed [\_TZ_.C1D3] (Node c12d05c0), AE_NOT_FOUND
ACPI-1120: *** Error: Method execution failed [\_TZ_.TZ3_._TMP] (Node cfeff780), AE_NOT_FOUND


best regards,
MB

Help ....

Check compaq's web-site for a BIOS-update ...

I've had a similar problem with one of those.
After the BIOS-upgrade the speed-throttling
also worked :}


Cheers,
Tink