Public bug reported: On Ubuntu Oneiric, I discovered a serious power regression from Kernel 3.0.0-6-generic to 3.0.0-7-generic. It is on an Intel Sandy Bridge Laptop. Unplugging the laptop from ac power source I made the tests without any graphical user interface active with the same brightness and other settings. When I boot into the kernels I have the following idle power numbers with
grep rate /proc/acpi/battery/BAT0/state: - Kernel 3.0.0-6: present rate: 1530-1560mW - Kernel 3.0.0-7: present rate: 1950-2020mW It is a more than 30% (!!!) increase in power usage withe the same hw, same settings, different Kernel version. Which is really annoying as the laptop fans start working above 1700-1800mw, so it is night and day in usage comfort the laptop with the two kernels. Here is the kernel log for both versions: Log with 3.0.0-6: http://pastebin.com/e0UER3zf Log with 3.0.0-7: http://pastebin.com/5JcrZ5Br Please let me know if you need any more data on this. The problem is 100% reproducible. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: 3.0 kernel oneiric power -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/818830 Title: Serious power regression from kernel 3.0.0-6 to 3.0.0-7 (30% more power at idle) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/818830/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
