n On Mon, 16 Jun 2008, Frédéric BOITEUX wrote:
> Thanks for your answer, > > Le ven 13 jun 2008 11:04:20 CEST, Arjan van de Ven > <[EMAIL PROTECTED]> a écrit : > > > Adding C-states, while not impossible, isn't all that easy either ..... > > especially on older systems > > (on newer ones it's relatively easy because hte interface got standardized) > > Actually I tried to add some C-states to the DSDT as I seen on the web > (http://www.bughost.org/pipermail/power/2007-August/000890.html) but > didn't succeed : powertop did show the C-states, but wake-ups per > second's rate became an insane value (about 100 000) and use of > C-states was always the same (about 50% in C0 and 50% in C2), > even when modifying some known parameters to lower wake-ups rate. > > The main difference between experiments is that their system did have > already C1&C2, but mine didn't have any before to try to modify DSDT. > So I wonder if updating Processor part of DSDT could be enough, or if > the BIOS should be aware of C-states management, which mine lacks for > sure. This is generally a bad plan. Even if the processor supports them, one has to wonder why the motherboard in their BIOS. They may be working around a motherboard, chipset, or author of the web page above notes that the changes save power, but that the system occasionall hangs. Is that really what you want to do? The reason you get a bunch of wakeups per second it that the C-states you have invented do not actually exist, and thus return immediately. -Len
_______________________________________________ Power mailing list [email protected] http://www.bughost.org/mailman/listinfo/power
