Latest working kernel version: none Earliest failing kernel version: 2.6.25 Distribution: Fedora 9 Hardware Environment: Intel Core 2 Quad Q9300 CPU on a Shuttle barebones SG33G5, DDR2 800 4GB RAM. BIOS version SG33S117. Software Environment: FC9 updates completely running kernel 2.6.25.11-97.fc9.i686. Problem Description: acpi_cpufreq doesn't load. Windows XP is able to do freq scaling. CPU is can operate in 2.0 GHz and 2.5 GHz. I checked the BIOS "PPM" option and it has "Native" and "SMM". SMM is apparently for legacy OS. Tried both. Neither helped. I know that kernel.org kernel needs to be used for reporting bugs. But I'm in the process of learning how to compile and install a customer kernel.org kernel in Fedora 9. Will update the bug once I get that working. Although my dmesg output shows nvidia, I have confirmed that this doesn't work even when nvidia module is not loaded. Steps to reproduce: modprobe acpi-cpufreq
Created attachment 17160 [details] output of acpidump
Created attachment 17161 [details] dmesg output with cpufreq.debug=7 and after trying modprobe acpi-cpufreq
Created attachment 17162 [details] output of lspci -vxxx
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Sorry if this bug report generated several emails. This is my first bugzilla (not just kernel) bug report. So pardon my stupidity. Thanks, SK
Hi, SK From the acpidump it seems that there is no _PSS/_PCT/_PPC object, which is requred by acpi-cpufreq driver. In such case acpi-cpufreq driver can't be loaded. But the issue is that Windows XP is able to do freq scaling. CPU is can operate in 2.0 GHz and 2.5 GHz. How do you know that the cpufreq scaling works on windows XP? thanks.
Will you please try to upgrade BIOS and see whether the problem still exists? Thanks.
As this issue is caused by that no acpi object of _PSS/_PCT/_PPC is defined in ACPI table, this bug will be rejected. Thanks.