> Date: Sat, 17 Dec 2005 18:14:01 +0100 > From: martinko <[EMAIL PROTECTED]> > > Kevin Oberman wrote: > >>Date: Fri, 16 Dec 2005 14:29:39 -0600 > >>From: Craig Boston <[EMAIL PROTECTED]> > >>Sender: [EMAIL PROTECTED] > >> > >> > >>>-cpu0: <ACPI CPU (4 Cx states)> on acpi0 > >>>+cpu0: <ACPI CPU> on acpi0 > >>> > >>>Q: Guessing that's a formatting difference, rather then 6.x not > >>>recognizing > >>>the states (sysctl hw.acpi.cpu.cx_supported confirms 4 states) > >> > >>Not sure on this, but you're probably better off using EST anyway as I > >>think it gives you more control over the processor frequency. > > > > > > No. There is no conflict between Cx states and EST. Cx states specifies > > how deeply the CPU will sleep when idle. EST controls processor speed > > and voltage. In most cases, your REALLY want to use both of these. They > > are very significant in saving power. (Of course, USB tends to limit the > > effectiveness of Cx states. I need to run without USB to get really good > > battery life and to make suspend (S3) really ut power drain. > > > Kevin, > > I used to have 3 Cx states supported when I started with FreeBSD on > version 5.3. Since I upgraded to 5.4 and recently to 6.0, all I can see > is just one supported Cx state. I much wonder why. (?)
What value do you have in /etc/rc.conf (if any) for performance_cx_lowest? It defaults to HIGH which will limit you to only the most power hungry sleep state (simple halt). This was made the default because some hardware was breaking when this was defaulted to LOW. T0 get other Cx states to be utilized, add 'performance_cx_lowest="LOW"' to /etc/rc.conf. -- R. Kevin Oberman, Network Engineer Energy Sciences Network (ESnet) Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab) E-mail: [EMAIL PROTECTED] Phone: +1 510 486-8634 _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
