Description of problem: My Laptop consumes 20W when idle on Core2Duo T5250 (2x1.5GHz). 77% of CPU Wakeups are caused by Load Balancing Tick in kernel scheduler. Version-Release number of selected component (if applicable): kernel-2.6.35.10-74.fc14.x86_64 How reproducible: Always Steps to Reproduce: 1. Boot a machine 2. Check powertop 3. Actual results: My laptop is consuming 20W of power with minimum screen backlight, BT off, ide Wi-Fi, idle HDD etc. 2000 Wakeups per second are caused by Load Balancing Tick. Previous kernels (before F14) allowed me to achieve 10.2W/h power consumption. Expected results: No more additional power consumption and CPU wakeups caused by kernel internals. Additional info:
Created attachment 471634 [details] Simmilar bug found on Ubuntu Launchpad
Created attachment 471635 [details] powertop with nozh=off Powertop console output when booted with nohz=off
Energy economy was better when I've booted Fedora 14 with kernel kernel-2.6.34.7-66.fc13.x86_64 from Fedora 13. There was Load Balancing tick too, but it used less CPU wakeups. Problematic is a fact, that with kernel mentioned above LCD backlight can't turn on when laptop wakes up from suspend to RAM.
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