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01-29-2007 01:31 AM
01-29-2007 01:31 AM
cpu frequency scaling not supported on TC4400
Hi,
I installed various Linux distributions on my HP TC4400 tablet with T2500 dual core cpu. In all cases I could not get cpu frequency scaling to work. The distributions I tried were Ubuntu 6.10 (with linux kernel 2.6.17) and OpenSUSE 10.2 (kernel 2.6.18) and a new Fedora version.
I would greatly appreciate any information on why this problem exists and how I can solve it. Under linux my battery lasts approx 2:30 hours while under Windows XP the battery lasts approx 5 hours.
In detail, what I see is the following (the same situation for all the tried linux distributions):
- I would expect a directory
/sys/devices/system/cpu/cpu0/cpufreq/
but this directory does not exist
- lsmod lists the following modules which are related to cpufreq: cpufreq_usedspace, cpufreq_stats, freq_table, cpufreq_powersave, cpufreq_ondemand, cpufreq_conservative, speedstep-lib. modprobe on any of these does not show any error messages.
- dmesg showed the following information that might be relevant:
[17179571.852000] ACPI: Looking for DSDT ... not found!
...
[17179573.688000] CPU1: Intel(R) Core(TM) Duo CPU T2500 @ 2.00GHz stepping 0c
...
(and similar for CPU0)
- trying to run e.g. powernowd or gnome's frequency scaling monitor results in error message "cpu frequency scaling not supported".
I would be very grateful for help and of course I would be happy to provide more detailed information!
Dominik
I installed various Linux distributions on my HP TC4400 tablet with T2500 dual core cpu. In all cases I could not get cpu frequency scaling to work. The distributions I tried were Ubuntu 6.10 (with linux kernel 2.6.17) and OpenSUSE 10.2 (kernel 2.6.18) and a new Fedora version.
I would greatly appreciate any information on why this problem exists and how I can solve it. Under linux my battery lasts approx 2:30 hours while under Windows XP the battery lasts approx 5 hours.
In detail, what I see is the following (the same situation for all the tried linux distributions):
- I would expect a directory
/sys/devices/system/cpu/cpu0/cpufreq/
but this directory does not exist
- lsmod lists the following modules which are related to cpufreq: cpufreq_usedspace, cpufreq_stats, freq_table, cpufreq_powersave, cpufreq_ondemand, cpufreq_conservative, speedstep-lib. modprobe on any of these does not show any error messages.
- dmesg showed the following information that might be relevant:
[17179571.852000] ACPI: Looking for DSDT ... not found!
...
[17179573.688000] CPU1: Intel(R) Core(TM) Duo CPU T2500 @ 2.00GHz stepping 0c
...
(and similar for CPU0)
- trying to run e.g. powernowd or gnome's frequency scaling monitor results in error message "cpu frequency scaling not supported".
I would be very grateful for help and of course I would be happy to provide more detailed information!
Dominik
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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