On Thursday 11 December 2008 18:20:56 you wrote: > Hi- > > I am using the current 2.6.27.8 kernel on Fedora 10: > http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.27.8.tar.bz2 > > I am experiencing resets in cpu scaling policy using cpufreq and the > e_powersaver driver on my Cloudbook which uses a VIA C7-M CPU. <snip> > Unfortunately, there have been reports of other cloudbook users losing > keyboard and touchpad input after the cpu frequency scales to 400MHz, so > we try to set the policy to never allow cpufreq to scale that low. When > the reset occurs, apparently it does enter that condition soon after. > > I recently sent a bugreport to RedHat but it might take some time. I was > advised to ask here and in the least I might maintain my own kernel with > a patch until it's committed upstream. May be you are experiencing throttling, I say this because I already saw something similar, and in the case I saw was caused by passive trip point in acpi provided by bios/dsdt being too low, also was a Via based netbook. If I remember correctly you can check current state (if throttling is active) looking at /proc/acpi/processor/CPUn/throttling Try loading thermal module with option psv=-1 to disable passive trip point limit (add "options thermal psv=-1" to /etc/modprobe.conf or load manually giving the option), or even use the "off" option to disabling thermal control entirely if the first one doesn't help, this is only a suggestion and may be not your real problem, it would require to see the dsdt and debug more to see what's happening. Can you attach acpidump output? (I don't know on Fedora but probably is on a package named pmtools). > > Thanks for your help- > > Amin -- []'s Herton -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
