High pitch noise from CPU when on battery

Please attach dmesg out (do not paste into comment).

Can you try booting with the pci=nomsi kernel option?

Same problem with this option.

Today I noticed that on my Thinkpad the noise is only there if I disable bluetooth, either with the hardware swith or # echo disable > /proc/acpi/ibm/bluetooth. However this seems not to help on other notebooks.

I can confirm this bug on my Lenovo 3000 n100 (core duo).

This is with feisty and kernel 2.6.20-15. This did not happen in edgy.

What happened between the two releases that this problem has shown up again. Reading previous bug reports it seemed like this problem occurred in dapper but was fixed?

I encounter this bug, too.
# echo 2 > /sys/module/processor/parameters/max_cstate worked for me, but it also reduces my battery life. Is this bug on the schedule to be fixed soon?

I can confirm this bug on laptop HP nx8220.

I'm having this too, on a toshiba with an intel t7400 processor.
# echo 2 > /sys/module/processor/parameters/max_cstate solved it for me.

I wonder if this is covered under warranty. Seems like its an issue with the hardware. Anyone have any experience with complaints along these lines? I dont notice this when using Windows. Maybe its not using all the acpi power modes.

Beginning with the Hardy Heron 8.04 development cycle, all open Ubuntu kernel bugs need to be reported against the "linux" kernel package. We are automatically migrating this bug to the new "linux" package. However, development has already began for the upcoming Intrepid Ibex 8.10 release. It would be helpful if you could test the upcoming release and verify if this is still an issue - http://www.ubuntu.com/testing . If the issue still exists, please update this report by changing the Status of the "linux" task from "Incomplete" to "New". We appreciate your patience and understanding as we make this transition. Thanks!

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

This issue is still apparent in Alpha5, linux-image-2.6.27-2-generic on x86_64. Let me know if there is more information I can provide.

Experiencing the same thing under 8.10 beta. Was able to work around under feisty with the cstate solution - no longer available. Noise was present in Gutsy, but to a lesser extent. Now, under Ibex, the volume of the noise seems higher.

2.6.27-4-generic #1 SMP Wed Sep 24 01:29:06 UTC 2008 x86_64 GNU/Linux
Description: Ubuntu intrepid (development branch)
Release: 8.10

This seems be a duplicate of bug 206864 so I am marking it as such. There is a workaround mentioned in comment 14 of that report - https://bugs.edge.launchpad.net/ubuntu/+source/linux/+bug/206864/comments/14 . Thanks.

The duplicate status is wrong. Bug #206864 indicates that the WORKAROUND to this bug no longer works. Since this bug was filed long before, bug #206864 should be marked as the duplicate of bug #93067. Why is that not the case?

thomerz, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-v3.11

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]