On Sat, Dec 16, 2006 at 02:59:53AM -0500, Lincoln Baxter, III wrote: > Pavel Troller wrote: > >Hi! > > > >Try the following: > > cat /proc/acpi/processor/*/power in the following situations: > > 1) After loading the processor module being on the battery, > > 2) After loading the processor module being on AC, > > 3) After disconnecting the AC, > >and compare the results. I think that for 1), you will see more C-states > >than > >for 2) and that possibly the missing C-states are not added for 3). > > > And the reason the hum seems to go away when AC is plugged back in, is > because it switches to C2. > > I have this question, however. While the CPU is powered down, > /proc/cpuinfo still shows the full frequency of the chip, at 1823Mhz. > When I enable cpufrequtils, and clock down the processor, there is no > change in noise or power consumption, it's still noisy, and it's still . > If this is the case, then why bother with cpufrequtils in the first > place... also... I still have the question of why doesn't this happen in > windows? What power state is windows running in to get as much or more > battery life, and still have no humming noise? > > It seems like the processor module must be doing something that isn't > quite right. I heard that there's supposed to be a C0, and a C4 power > state for the core duo processor, but I don't see those in the list of > options. Any ideas as to why they don't show up? As far as i know, the humming appears in windows too. I tested it with the RMClock utility and on my laptop, switching to C4 was making the humming. But every other C-State was quite. You should tune the timing frquencies, like Pavel pointed out. But i'm curios, why on linux the C4-State does not show up. The maximum working C-State on my system, on AC or battery is C3. Is there any hidden switch to enable it? with regards, frank - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
