Red Hat Bugzilla – Bug 477917
acpi-cpufreq doesn't detect speed limit when cold booted on battery
Last modified: 2009-12-18 02:23:44 EST
Description of problem:
When on battery power, my notebook's BIOS specifies that the maximum CPU speed should be 1.2 GHz. But immediately after booting on battery, acpi-cpufreq thinks the maximum speed is 2.101 GHz (what it should be on mains power). Switching briefly to mains, or pressing the "power save" button (which imposes a 1.2 GHz limit when on mains), seems to kick it all into place and thereafter the limit is 1.2 GHz on battery, 2.101 on mains.
Version-Release number of selected component (if applicable):
kernel-220.127.116.11-167.fc10.x86_64 and some earlier.
Steps to Reproduce:
1. Cold boot on battery power.
2. Observe CPU will scale up to 2.101 GHz.
3. Briefly switch to mains or press power-save button.
4. Note maximum frequency on battery is now 1.2 GHz.
Consistent power source--frequency table relationship from boot.
Persists through 2.6.29-0.43.rc2.git1.fc11.x86_64.
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