Bug 166310 – CPU stuck on lowest speed when starting from battery

• Status: VERIFIED TEST-REQUEST
• Product: Gentoo Linux

[Description Erik 2007-02-11 09:40:39 UTC]

When I start my laptop from battery, I notice horrible performance. I look at /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq and see that it is stuck at 600000 (lowest), no matter how much is needed. (/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq shows 1600000 and the scheduler is ondemand.) I have a compile running so it should be 1600000 (highest). Attaching it to power does not help, it has to be rebooted.

This makes the system almost unusable as a laptop. I can not take it with me somewhere, start it and work with it. What I have to do is to connect it to power somewhere, start it, disconnect it and take it with me. But this limits the usefulness greatly.

Reproducible: Always

Steps to Reproduce:




# grep -r "" /sys/devices/system
/sys/devices/system/clocksource/clocksource0/available_clocksource:acpi_pm jiffies tsc pit
/sys/devices/system/clocksource/clocksource0/current_clocksource:acpi_pm
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load:0
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold:80
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate:80000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_min:40000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max:40000000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:1600000 1600000 1600000 1400000 1200000 1000000 800000 600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:ondemand performance
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:centrino
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:ondemand
/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:1600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:600000
# cat /proc/version
Linux version 2.6.18-gentoo-r6 (root@localhost) (gcc version 4.1.1 (Gentoo 4.1.1-r1)) #1 Thu Dec 28 15:19:30 CET 2006

[Comment 1 Jakub Moc (RETIRED) 2007-02-11 10:08:29 UTC]

Please, try w/ 2.6.19-r6 (and latest vanilla-sources if it still doesn't work) and report back. Thanks.

[Comment 2 Erik 2007-02-16 15:55:42 UTC]

I have tested to start from battery with 2.6.19-r5 and it went up to 1600000 when needed. But I tried again with 2.6.18-r6 and it worked there too this time. So it is not always reproducible (I have observed the bug a few times in the past). I will let you know if I make any more interesting observations about this.

[Comment 3 Erik 2007-02-17 11:04:18 UTC]

Now the bug has happened with 2.6.19-r5:
# grep -r "" /sys/devices/system
/sys/devices/system/clocksource/clocksource0/available_clocksource:acpi_pm jiffies tsc pit
/sys/devices/system/clocksource/clocksource0/current_clocksource:acpi_pm
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/powersave_bias:0
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/ignore_nice_load:0
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold:80
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate:80000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_min:40000
/sys/devices/system/cpu/cpu0/cpufreq/ondemand/sampling_rate_max:40000000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:1600000 1600000 1600000 1400000 1200000 1000000 800000 600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:ondemand performance
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:centrino
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:ondemand
/sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0
/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:1600000
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:600000
localhost ~ # cat /proc/version
Linux version 2.6.19-gentoo-r5 (root@localhost) (gcc version 4.1.1 (Gentoo 4.1.1-r3)) #1 Sun Feb 11 13:09:03 CET 2007

[Comment 4 Erik 2009-08-11 10:27:26 UTC]

Seems to work nowadays.