[Xen-users] Dom0 ignoring custom DSDT (injected through Grub2), cpufreq doesn't work

[mkbug@xxxxxxxxxxxxxxxx]

I'm running Xen 4.0 on Linux 2.6.32 using the current stock packages provided 
in Debian Squeeze. The BIOS of this particular computer appears to have a 
rather bad ACPI implementation and doesn't contain any P-states in the DSDT, so 
I fixed the DSDT manually and inject it by adding acpi -e /boot/dsdt.aml to my 
Grub2 configuration.

This does work perfectly when not booting in Xen mode (cpufreq takes control of 
the CPU and the CPU fan spins down after half a minute or so). But when I boot 
in Xen mode, I get these dmesg error messages, suggesting that it ignored the 
fixed DSDT injected by Grub2 (these are the same errors that showed up in 
non-Xen mode before I fixed the DSDT):
[   15.778182] powernow-k8: Found 1 AMD Athlon(tm) 64 X2 Dual Core Processor 
4800+ processors (2 cpu cores) (version 2.20.00)
[   15.778195] [Firmware Bug]: powernow-k8: No compatible ACPI _PSS objects 
found.
[   15.778197] [Firmware Bug]: powernow-k8: Try again with latest BIOS.

I already tried adding cpufreq=dom0-kernel to the Xen line in my Grub 
configuration, but that didn't do anything either.

Is there any difference in the way the Linux kernel and Xen access the DSDT? If 
so, any suggestions on how to get a custom DSDT working with Xen?
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