Re: [gentoo-user] CPU throttling
> I have a Acer Aspire Laptop and try to save enery ;-) I don't know if you laptop does support it, but you might have a look at cpufreq: "Clock scaling allows you to change the clock speed of the running CPU on the fly. This is a nice method to save battery power, because the lower the clock speed, the less power the CPU consumes. CPUFreq is a generic framework to make architecture implementation specifics transparent to a user. Currently, CPUFreq supports various ARM CPUs (Integrator, SA1100, SA1110), and various x86's (AMD PowerNOW, VIA Cyrix Longhaul). This project also incorporates some work at reverse engineering support for Intel Speedstep technology." It is included in the ac-sources and the development/mm-sources. Daniel -- [EMAIL PROTECTED] mailing list
RE: [gentoo-user] CPU throttling
> > I read about autospeedstep, and installed it. It compiled well, > > and runs well, and /var/log/speedstep indicates that it changes > > betrwwn powersave and full power, but i don't quite trust it : > > speedstep has nothing to do with throttling. Speedstep changes the > cpu clock rate between two frequencies, throttling stops the cpu > for some time by stopping the clock signal at all. > So you may have to look at /proc/cpuinfo, I don't have a speedstep > capable processor, so I cannot check this. You can manually change the throttling with something like: echo 5 > /proc/acpi/x/throttle It works fine on my Asus L3800S (P4). If I want to get a good battery life, I dim the display, and set throttle to 5 or 6 (out of a range of 0..7, where 0=fast). I haven't measured the effect, but I think it extends battery life by 1/3 at least. The P4 in my Asus also does not have speedstep (according to the kernel, when I enabled speedstep in the kernel config). Gwen. -- [EMAIL PROTECTED] mailing list
Re: [gentoo-user] CPU throttling
Hi Tobias, Am Montag, 7. Juli 2003 16:11 schrieb [EMAIL PROTECTED]: [...] > I read about autospeedstep, and installed it. It compiled well, > and runs well, and /var/log/speedstep indicates that it changes > betrwwn powersave and full power, but i don't quite trust it : speedstep has nothing to do with throttling. Speedstep changes the cpu clock rate between two frequencies, throttling stops the cpu for some time by stopping the clock signal at all. So you may have to look at /proc/cpuinfo, I don't have a speedstep capable processor, so I cannot check this. [...] > The website says I need an ACPI-backport-patch, but when i tried > to apply it to my gentoo-sources kernel, it seemd to be already > installed. Yes, they are. Kai -- [EMAIL PROTECTED] mailing list
