Fan control broke in 2.6.27-11

[Rob Glenn]

Binary package hint: linux-image-2.6.27-11-generic

After resume from suspend, the fan in my laptop runs continuously at full speed regardless of CPU load. I have an HP 2230s laptop with ubuntu 8.10 installed.

Fan behavior returns to normal after plugging in the AC, but that's not really a suitable workaround.

I tried rebooting with the previous kernel version (2.6.27-9) and the fan worked correctly after suspend/resume, without any need to plug in the AC. So this appears to be due to a change in the most recent version.

[Leann Ogasawara (leannogasawara)]

Hi Rob,

Thanks for reporting this regression. I'm tagging this "regression-update". The Jaunty 9.04 release is set to come out at the end of the month. I'm curious if you could confirm if the issue exists with this release as well. You should be able to test suspend using a LiveCD - http://www.ubuntu.com/testing/jaunty/beta . Please let us know. Thanks.

[Bryan Wu (cooloney)]

Hi Rob,

The latest kernel of 8.10 is 2.6.27-14 now, could you please try that on you laptop and let us know the result?
It is much easier for you to test it, IMHO.

Thanks
-Bryan

[Bryan Wu (cooloney)]

Rob,

Could you please tell us which version of 2.6.27-11 kernel fails on you machine? Actually, there are 7 tags: 2.6.27-11.[21-27]. Or please follow this https://help.ubuntu.com/community/ReportingBugs.

Thanks a lot
-Bryan

[Bryan Wu (cooloney)]

oops, wrong URL, please follow this wiki page to report a kernel bug. https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies.

-Bryan

[Rob Glenn (glennra)]

Hi! Thanks for getting back to me.

Synaptic shows I had version 2.6.27-11.27, which I believe was the
latest version that was advertised at the time I observed the problem
last Thursday. However, the fan works correctly after suspend in
2.6.27-11.31, which is the version that I was able to upgrade to with
the system updater right now.

I expect it's probably a moot point, but just in case, I attached the
data from the earlier version that the kernel bug webpage asked to
collect.

Thanks!
Rob

On Thu, 2009-04-09 at 17:06 +0000, Bryan Wu wrote:
> oops, wrong URL, please follow this wiki page to report a kernel bug.
> https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies.
>
> -Bryan
>

[Bryan Wu (cooloney)]

Rob,

It looks like this issue was gone away since 2.6.27-11.31 kernel release on intrepid. So I highly suggest that you try the Jaunty beta release on you machine to verify this issue as Leann mentioned this bug tracker.

Or if you have time, please test other 2.6.27-11.xx kernel such as 2.6.27-11.21 to help us narrow down the target kernel version.

Thanks a lot
-Bryan

[Bryan Wu (cooloney)]

Rob,

One thing, the latest kernel version on Intrepid 8.10 should be 2.6.27-14.32. Could you please try that?

-Bryan

[Rob Glenn (glennra)]

I haven't had a chance to try the ubuntu 9.04 beta cd yet, but, when I
look for 2.6.27-14, I don't see it in Synaptic, and the upgrade manager
says the system is up to date. Is there something special I need to do
to see the later version?

Thanks,
Rob

On Fri, 2009-04-10 at 07:04 +0000, Bryan Wu wrote:
> Rob,
>
> One thing, the latest kernel version on Intrepid 8.10 should be
> 2.6.27-14.32. Could you please try that?
>
> -Bryan
>

[Bryan Wu (cooloney)]

Rob,

Please run the similar command and post the result:

----
$ sudo dpkg -l | grep linux-image
rc linux-image-2.6.27-11-generic 2.6.27-11.27 Linux kernel image for version 2.6.27 on x86
rc linux-image-2.6.27-7-generic 2.6.27-7.16 Linux kernel image for version 2.6.27 on x86
rc linux-image-2.6.28-10-generic 2.6.28-10.33 Linux kernel image for version 2.6.28 on x86
ii linux-image-2.6.28-11-generic 2.6.28-11.42 Linux kernel image for version 2.6.28 on x86
rc linux-image-2.6.28-8-generic 2.6.28-8.28 Linux kernel image for version 2.6.28 on x86
rc linux-image-2.6.28-9-generic 2.6.28-9.31 Linux kernel image for version 2.6.28 on x86
----

I am using Jaunty 9.04 now, so I don't know your system configuration. At this moment, we are going to release Jaunty. This bug was gone in Intrepid. So I will set this bug as "invalid". If you find this bug on Jaunty, please feel free to fire new bug.

-Bryan