Just being a good citizen by reporting as requisted by in dmesg: [Firmware Bug]: powernow-k8: Your BIOS does not provide ACPI _PSS objects in a way that Linux understands. Please report this to the Linux ACPI maintainers and complain to your BIOS vendor. I've attached all detail info according to the ACPI HOWTO. Distribution: Mythbuntu 9.04 Kernel: 2.6.28-13-generic
Created attachment 22021 [details] acpidump
Created attachment 22022 [details] dmidecode
Created attachment 22023 [details] dmesg
Created attachment 22024 [details] /var/log/messages
Created attachment 22025 [details] GRUB config for boot params
Created attachment 22026 [details] kernel config
Hi, Fred From the acpidump in comment #1 it seems that there is no _PSS object, which is required by the frequency driver. In fact we see this on a lot of boxes based on AMD chipset. This is a BIOS bug and had better be fixed by upgrading BIOS. Please forward this info to the BIOS vendor and see whether this can be fixed by BIOS. Thanks.
(In reply to comment #0) > [Firmware > Bug]: powernow-k8: Your BIOS does not provide ACPI _PSS objects in a way that > Linux understands. Please report this to the Linux ACPI maintainers and > complain to your BIOS vendor. If you run the latest git kernel, you can see this message instead, "No compatible ACPI _PSS objects found. Try again with latest BIOS." I'll close this because it's a BIOS problem that we can not fix in Linux kernel. Fred, please re-open it if you still have any questions...
I, too have encountered this on a Tyan S2882-D using AMD Opteron 280s. Currently running a Debian compile of 2.6.32, though judging from the above bug report, a vanilla kernel would present much the same issue. An earlier kernel (2.6.18 iirc, it's been some time since I booted it) was able to support powernow just fine. While I understand that this is largely a bios issue, there are two reasons I'm adding to this bug: 1. Tyan has not released a bios update for this board since mid-2006, and is highly unlikely to do so now. 2. The powernow-k8 driver *used* to support this board, but somewhere along the line, something changed in the driver and now it no longer does. Can we revert to the old behavior? The hardware (cpu + board) clearly has powernow support, and I'd like to use it. While I realize that this is older hardware, it's still recent enough that it's not uncommon to find it in use. I can provide any information necessary to help move this along. Thanks.
Created attachment 26406 [details] please attach all your ACPI tables, using this script.
Created attachment 26417 [details] acpi-tables dump