Have a look at the modules in /lib/modules/2.6.18-1.2849.fc6/kernel/arch/i386/kernel/cpu/cpufreq. One of these are bound to expose control of your cpu's speed over /sys/devices/system/cpu/cpu0/cpufreq/. cpuspeed, powernowd, cpufreqd, etc all pretty much do the same thing in this sys folder to control your cpu's speed given battery, AC, temperature, etc. states.
The cpufreq_ondemand, cpufreq_conservative, cpufreq_powersave are frequency governors that set the cpu frequency between the scaling_min_freq and scaling_max_freq values of this sys folder. My guess for the Celeron would be the ACPI Processor P-States driver. but if this doesn't work then one of the Intel speedstep drivers may work. If you get this working you could easily double the battery life of your laptop and probably make it run quieter. On Thursday 04 January 2007 11:06, Howard Lowndes wrote: > # cat /proc/cpuinfo > processor : 0 > vendor_id : GenuineIntel > cpu family : 15 > model : 2 > model name : Mobile Intel(R) Celeron(R) CPU 2.50GHz > stepping : 9 > cpu MHz : 2493.933 > cache size : 256 KB > fdiv_bug : no > hlt_bug : no > f00f_bug : no > coma_bug : no > fpu : yes > fpu_exception : yes > cpuid level : 2 > wp : yes > flags : fpu vme de pse tsc msr pae mce cx8 mtrr pge mca > cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up cid > xtpr bogomips : 4989.96 > > > I tried running: > service cpuspeed start > but it fails to run. When I look at the script it's doing a grep for > est in the flags field, which is not found and hence cpuspeed fails. > > I notice that /etc/cpuspeed.conf doesn't have $DRIVER defined. The > likely drivers that I can find are: > # ll /lib/modules/2.6.18-1.2849.fc6/kernel/drivers/cpufreq/ > total 56 > -rwxr--r-- 1 root root 15608 Nov 11 06:57 cpufreq_conservative.ko > -rwxr--r-- 1 root root 14252 Nov 11 06:57 cpufreq_ondemand.ko > -rwxr--r-- 1 root root 7860 Nov 11 06:57 cpufreq_powersave.ko > -rwxr--r-- 1 root root 13336 Nov 11 06:57 cpufreq_stats.ko > > > Any ideas? > > Joseph Goncalves wrote: > > What type of cpu does your laptop have? > > > > On Thursday 04 January 2007 05:17, Howard Lowndes wrote: > >> Sadly I now discover that my lappy is not capable of cpu speed > >> control :( > >> > >> Joseph Goncalves wrote: > >>>>> try: > >>>>> cat /proc/acpi/thermal_zone/*/trip_points > >>>>> to see what temperature the computer will turn off at and > >>>>> cat /proc/acpi/thermal_zone/*/temperature > >>>>> to see the temperature the computer is currently at... > >>>> > >>>> That's interesting, I didn't know about those, though I do have > >>>> a temp monitor on my lappy screen. Any ideas on how to tweak > >>>> them as I see the critical temp is set at 109C and the other > >>>> temps at 108C, and during the recent hot weather with no room > >>>> aircond when running Winders under VMware it would occasionally > >>>> shut down - yes the CPU fan is running. > >>> > >>> If I understand what you are saying correctly, I believe you are > >>> asking if you could tweak the trip points. The short answer is > >>> no, if your computer is overheating, it is overheating. But if > >>> you have a problem with your computer overheating, you could use > >>> cpufreqd to slow the CPU down if the temperature goes above a > >>> certain temperature. That would have an effect of cooling down > >>> the machine a bit. > >>> > >>> You also could use the on-demand governor that automatically > >>> switches your CPU from a slow to faster speed based on the demand > >>> on the CPU. Since your computer's CPU wouldn't be running at 100% > >>> all of the time, this would have a significant cooling effect. > >>> This again can be setup with cpufreqd. > >>> > >>> I use cpufreqd on all my laptops, because I had a problem with > >>> one laptop overheating when I was compiling. > >>> > >>>> Howard. > >>>> LANNet Computing Associates - Your Linux people > >>>> <http://lannetlinux.com> When you want a computer system that > >>>> works, just choose Linux; When you want a computer system that > >>>> works, just, choose Microsoft. -- > >>>> Flatter government, not fatter government; abolish the > >>>> Australian states. > >>> > >>> Regards > >>> Joseph > >> > >> -- > >> Howard. > >> LANNet Computing Associates - Your Linux people > >> <http://lannetlinux.com> When you want a computer system that > >> works, just choose Linux; When you want a computer system that > >> works, just, choose Microsoft. -- > >> Flatter government, not fatter government; abolish the Australian > >> states. > > -- > Howard. > LANNet Computing Associates - Your Linux people > <http://lannetlinux.com> When you want a computer system that works, > just choose Linux; When you want a computer system that works, just, > choose Microsoft. -- > Flatter government, not fatter government; abolish the Australian > states. -- SLUG - Sydney Linux User's Group Mailing List - http://slug.org.au/ Subscription info and FAQs: http://slug.org.au/faq/mailinglists.html
