Modifying max_cstate on a running kernel is necessary if you want to be able to change it without reconfiguring/rebooting. e.g. I use C6 when on airplanes for longer battery life, but disable it otherwise because it causes a high-pitched noise on some hardware (my T500 among others). It's pretty inconvenient to have to reboot every time I want to change it....
Josh On Sep 22, 2009 8:25 AM, "Alex Tomic" <atomic...@gmail.com> wrote: For anyone trying to get this to work with more recent Ubuntu versions, I can confirm that setting the kernel option works for me on my Thinkpad T43 on Ubuntu 9.04. Setting the max_cstate=3 was sufficient, and I am noticing little difference in power consumption (when idle with the lowest screen brightness I am at about 15W), so from my perspective this problem is solved. Applying the setting to /etc/modprobe.d/options did not work for me. -- Unable to set max_cstate on hardy kernel https://bugs.launchpad.net/bugs/206864 You received this bu... Status in “linux” package in Ubuntu: Triaged Bug description: On earlier kernels I could set the max_cstat to get rid of the hissing/whining noi... -- Unable to set max_cstate on hardy kernel https://bugs.launchpad.net/bugs/206864 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
