################################################# Description of problem: ################################################# I loaded Fedora 10 on my Sylvania G (read: cloudbook) which uses a c7-m CPU. Many cloudbook users complain that when the e_powersaver module scales the CPU to 400MHz, the system enters an unstable state where the keyboard/touchpad no longer is responsive. The current known workaround is to manually set the minimum scale frequency in cpufreq to avoid the problem. I put this in an init script(anything as low as 500MHz is fine also): echo 700000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq Many people say this works fine, but I am having trouble. A short time after the system boots, cpufreq resets the ceiling and floor frequencies. cpufreq-info reports: current policy: frequency should be within 480 MHz and 500MHz. Soon after, the system enters that dreaded state and a USB keyboard is required to reboot the machine. It doesn't matter which cpufreq governor I use or what frequencies I set using cpufreq-set. Furthermore, if I try to reset the frequencies after this reset, I get this error: [root@ronin ~]# cpufreq-set -d 700MHz Error setting new values. Common errors: - Do you have proper administration rights? (super-user?) - Is the governor you requested available and modprobed? - Trying to set an invalid policy? - Trying to set a specific frequency, but userspace governor is not available, for example because of hardware which cannot be set to a specific frequency or because the userspace governor isn't loaded? ############################################################## Version-Release number of selected component (if applicable): ############################################################## cpufrequtils-005-1.fc10.i386 kernel-2.6.27.5-117 ################## How reproducible: ################## Always #################### Steps to Reproduce: #################### 0. Install Fedora 10 on a Cloudbook 1. Create an Initscript that resets the minimum scaling frequency: echo 700000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq 2. Reboot Actual results: The frequency range gets reset to 480-500MHz. Machine rendered unable to accept input from keyboard/touchpad. Expected results: The frequency range remains at the set value. Additional info:
I looked through dmesg, /var/log/messages, and /var/log/Xorg.0.log. No log entries indicate any error related to this behavior.
can you boot with cpufreq.debug=7 and repeat the above, and then attach the output of dmesg ? thanks.
Created attachment 325850 [details] dmesg output dmesg output from system with kernel cheatcode cpufreq.debug=7, e_powersaver scaling module, ondemand governor, and minimum scaling frequency=600MHz.
Also, with recent tinkering, I discovered the same results were observed with the acpi_cpufreq scaling driver.
I also tried configuring the cpuspeed service in /etc/sysconfig/cpuspeed thinking it perhaps might handle the processor scaling more effectively. No effect.
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