I haven't coded in a while and its quite late my time so maybe I'm being stupid but looking at the processor_idle.c file and even the entire drivers/acpi directory can't find any mention of state C4. If you grep for C3 you get a lot of hits but C4 shows nothing. Are you sure linux even support C4?
>From some observation (and the usage counter) I agree that C3 is used a lot and since, from the PDF file you sent a while ago, C4 saves about 8 watts more battery than C3 (~10 watts vs ~2 watts) I think this might really be important so it would be nice to see if we can even test this somehow. Incidentally there is some discussion on the kernel mailing list about hidden c-states in Linux where someone claims that remove the USB module will expose additional c-states but on the MBP since this is needed for the keyboard this is obviously hard to even test, let alone apply. cheers, Sheer On 4/7/07, Sven Anders <[EMAIL PROTECTED]> wrote: > Sheer El-Showk schrieb: > > Hi Sven, > > > > Thanks for coming up with all this info. Do you know if OS X uses the > > C4 state much? This state seems to save a lot of power (enough to > > account for a lot of the difference between OS X and Linux) but if it > > takes a long time to wake up from it might only be relevant when the > > machine is really idling. > > I do not know, but if you take a look a the C3 usage counter under linux, I > think the C4 state will be heavily too... > > You can try if the CHUD Tools will show you anything: > > ftp://ftp.apple.com/developer/Tool_Chest/Testing_-_Debugging/Performance_tools/CHUD_4.4.4.dmg > > > Incidentally I think the first option is the most likely and practical > > since we already run patched kernels (most of us) its not so hard to > > just have another patch. > > Yes, but this will NEVER make it into the official kernel ;-) > > Regards > Sven > > -- > Sven Anders <[EMAIL PROTECTED]> () Ascii Ribbon Campaign > /\ Support plain text e-mail > ANDURAS service solutions AG > Innstraße 71 - 94036 Passau - Germany > Web: www.anduras.de - Tel: +49 (0)851-4 90 50-0 - Fax: +49 (0)851-4 90 50-55 > > Rechtsform: Aktiengesellschaft - Sitz: Passau - Amtsgericht Passau HRB 6032 > Mitglieder des Vorstands: Sven Anders, Marcus Junker > Vorsitzender des Aufsichtsrats: Dipl. Kfm. Thomas Träger > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Mactel-linux-users mailing list Mactel-linux-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mactel-linux-users
