no acpi after feisty fawn installation

hi,

i've just installed kubuntu feisty fawn (i386) on my laptop today. But now no acpi-support is working. It seems to me, there is no acpi in the ubuntu-kernel (i can't imagine). The directory /proc/acpi does not exist, battery-state and cpu-throtteling do not work. The acpi moduls are not loadable. (battery, thermal, etc..)

In dapper everything was ok.

Some information:
Hardware: Yakumo Power64XD Notebook, AMD Athlon64 Mobile 3000+, Via-Chipset

:~$dmesg | grep ACPI
[ 0.000000] BIOS-e820: 000000003fff0000 - 000000003fffffc0 (ACPI data)
[ 0.000000] BIOS-e820: 000000003fffffc0 - 0000000040000000 (ACPI NVS)
[ 0.000000] ACPI: RSDP (v000 OID_00 ) @ 0x000e5010
[ 0.000000] ACPI: RSDT (v001 INSYDE RSDT_000 0x00000001 _CSI 0x00010101) @ 0x3fffcb40
[ 0.000000] ACPI: FADT (v001 INSYDE FACP_000 0x00000100 _CSI 0x00010101) @ 0x3ffffaa0
[ 0.000000] ACPI: BOOT (v001 INSYDE SYS_BOOT 0x00000100 _CSI 0x00010101) @ 0x3ffffb90
[ 0.000000] ACPI: DBGP (v001 INSYDE DBGP_000 0x00000100 _CSI 0x00010101) @ 0x3ffffbc0
[ 0.000000] ACPI: MADT (v001 INSYDE APIC_000 0x30303030 0000 0x30303030) @ 0x3ffffb30
[ 0.000000] ACPI: DSDT (v001 INSYDE K8T400 0x00001000 MSFT 0x0100000e) @ 0x00000000
[ 0.000000] ACPI: Disabling ACPI support
[ 15.228764] ACPI: Interpreter disabled.
[ 15.228783] pnp: PnP ACPI: disabled

:~$dmesg | grep acpi
[ 18.868536] thermal: Unknown symbol acpi_processor_set_thermal_limit

:~$cat /var/log/syslog | grep ACPI
May 12 23:46:35 luna kernel: [ 0.000000] BIOS-e820: 000000003fff0000 - 000000003fffffc0 (ACPI data)
May 12 23:46:35 luna kernel: [ 0.000000] BIOS-e820: 000000003fffffc0 - 0000000040000000 (ACPI NVS)
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: RSDP (v000 OID_00 ) @ 0x000e5010
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: RSDT (v001 INSYDE RSDT_000 0x00000001 _CSI 0x00010101) @ 0x3fffcb40
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: FADT (v001 INSYDE FACP_000 0x00000100 _CSI 0x00010101) @ 0x3ffffaa0
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: BOOT (v001 INSYDE SYS_BOOT 0x00000100 _CSI 0x00010101) @ 0x3ffffb90
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: DBGP (v001 INSYDE DBGP_000 0x00000100 _CSI 0x00010101) @ 0x3ffffbc0
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: MADT (v001 INSYDE APIC_000 0x30303030 0000 0x30303030) @ 0x3ffffb30
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: DSDT (v001 INSYDE K8T400 0x00001000 MSFT 0x0100000e) @ 0x00000000
May 12 23:46:35 luna kernel: [ 0.000000] ACPI: Disabling ACPI support
May 12 23:46:35 luna kernel: [ 15.228764] ACPI: Interpreter disabled.
May 12 23:46:35 luna kernel: [ 15.228783] pnp: PnP ACPI: disabled
May 12 23:46:44 luna powersaved: Starting powersaved without APM and ACPI support

I don't know what these messages mean. Google didn't help me.

Do you need more information?

Georg S.