Red Hat Bugzilla – Bug 496301
cpufreq not working on ASUS F3E/Core2Duo T8300
Last modified: 2010-07-20 08:47:51 EDT
Description of problem:
On my laptop (ASUS F3E with the Intel chipset and Core2Duo T8300 CPU), the CPU frequency scaling does not work with the Fedora 10 distribution kernel, the frequency is stuck at maximum (2.4 GHz). With vanilla kernel (at least 2.6.28 to 2.6.30-rc2) I have compiled myself, it works as expected. According to /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver from my own kernel, the scaling driver used is acpi-cpufreq.
Version-Release number of selected component (if applicable):
All kernels since the F10 release (sorry I did not get time to report this earlier), for example any of the following ones:
Steps to Reproduce:
1. Boot Fedora 10 on an ASUS F3E laptop
2. on an idle system, run "grep MHz /proc/cpuinfo"
or 3. run GNOME cpufreq-applet in a desktop session
The frequency reported is 2.4 GHz, the GNOME applet pops up a window saying "CPU frequency scaling unsupported".
The idle computer should run at 800 MHz and scale up the frequency as needed.
I did not found anything interesting when comparing the dmesg(8) output from my own kernel to the distribution one.
I am not sure whether the problem was also in F9.
This problem may be related to bug #468802.
Similar problem here on an x48 motherboard with an e8500 cpu.
Although I find it works ok on
but not on
Still present in 126.96.36.199-167.fc11.x86_64, changing Version: to F10.
Apparently to fix the problem it is sufficient to do
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo ondemand > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
before logging into the GNOME session. So the problem is that the acpi_cpufreq module is not being loaded automatically. My own vanilla kernels have this module built in, and I also select the ondemand governor as a default in my kernel config.
I am not sure about a proper fix in Fedora startup scripts, though.
it should be getting loaded by the cpuspeed service, make sure that's enabled.
If it is already enabled, can you boot the fedora kernel with cpufreq.debug=7, and attach the dmesg please?
Created attachment 355140 [details]
dmesg output for me:
(in reply to comment #4)
My cpuspeed service has not been enabled. chkconfig cpuspeed on fixed the problem for me, sorry for the noise.
Before closing the bug please wait for Chris Parkin's response whether his problem is the same.
I cannot start the cpuspeed service.
running cpuspeed in a shell fails to start it as well:
[root@warpcore ~]# cpuspeed
Error: Could not find any CPUFreq controlled CPU cores to manage
(In reply to comment #7)
> I cannot start the cpuspeed service.
> running cpuspeed in a shell fails to start it as well:
> [root@warpcore ~]# cpuspeed
> Error: Could not find any CPUFreq controlled CPU cores to manage
Your BIOS is apparently broken and does not support cpufreq:
ACPI Warning (dsobject-0502): Package List length (1D) larger than NumElements count (3), truncated
ACPI Warning (nspredef-0940): \_PR_.CPU0._PSS: Return Package type mismatch at index 2 - found Integer, expected Package 
ACPI: Invalid package argument
ACPI Exception (processor_perflib-0297): AE_BAD_PARAMETER, Invalid _PSS data 
[Firmware Bug]: BIOS needs update for CPU frequency support
It worked fine under kernel-188.8.131.52-170.2.24.fc10.x86_64
And works fine under Windows
But it's not worked under linux since kernel-184.108.40.206-170.2.35.fc10.x86_64
M/B is a LANPARTY DK X48-T2RSB PLUS
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