Messages in this thread | | | From | Arkadiusz Miskiewicz <> | Subject | Re: cpufreq limits avilable frequencies to 800MHz on git kernel | Date | Sun, 25 May 2008 11:36:24 +0200 |
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On Saturday 24 May 2008, Andrew Morton wrote: > On Fri, 23 May 2008 19:44:57 +0200 Arkadiusz Miskiewicz <arekm@maven.pl> wrote: > > thinkpad z60m, Intel(R) Pentium(R) M processor 2.00GHz. kernel from git > > from 1-2 days ago. > > > > Unfortunately it seems that suspend to ram/resume causes frequency > > to be limited to 800MHz only. I can't set it to 2GHz again :-/ > > > > scaling_max_freq is then 800000 and cannot be changed. > > > > reboot and the problem disappears until new suspend/resume cycle. > > > > cpufreq stuff is driven by acpi-cpufreq > > > > $ cpufreq-info > > cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006 > > Report errors and bugs to linux@brodo.de, please. > > analyzing CPU 0: > > driver: acpi-cpufreq > > CPUs which need to switch frequency at the same time: 0 > > hardware limits: 800 MHz - 2.00 GHz > > available frequency steps: 2.00 GHz, 1.60 GHz, 1.33 GHz, 1.07 GHz, 800 > > MHz available cpufreq governors: powersave, userspace, ondemand, > > performance current policy: frequency should be within 800 MHz and 800 > > MHz. The governor "performance" may decide which speed to use within this > > range. > > current CPU frequency is 800 MHz. > > > > /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0 > > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:800000 > > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:2000000 > > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:800000 > > /sys/devices/system/cpu/cpu0/cpufreq/related_cpus:0 > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:200000 > >0 1600000 1333000 1066000 800000 > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:powersav > >e userspace ondemand performance > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:800000 > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:acpi-cpufreq > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:performance > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:800000 > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:800000 > > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:<unsupported> > > Thanks. Is this a newly-occurring bug or did earlier kernels do this also? > > If it was newly added, do you know in which kernel version we might > have added it?
I wasn't able to reproduce the problem on final 2.6.24 but was able to reproduce on final 2.6.25. Problem introduced somewhere between it seems.
Note that 2-3 suspend to ram/resume cycles is needed to get into the problem.
-- Arkadiusz Miśkiewicz PLD/Linux Team arekm / maven.pl http://ftp.pld-linux.org/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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