/proc/cpuinfo reports incorrect information for Via C3

[Rolf Leggewie]

Binary package hint: linux-source-2.6.15

The output of "cat /proc/cpuinfo" is wrong

processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 6
model name : VIA Samuel
stepping : 2
cpu MHz : 400.179
[...]

My CPU has 600 MHz. And while cpu frequency scaling was still working (c.f. bug 45747) I always saw the true frequency to be underreported by 33%. It was 400/200 MHz when the machine was really running at 600/400 MHz.

Some possibly related issues where frequency is incorrectly reported are being discussed at http://groups.google.de/group/linux.kernel/browse_thread/thread/6d1b20ec35e21cbe/6d2b5fb0419c96e4?lnk=st

[Rolf Leggewie (r0lf)]

still the same in 2.6.20 which I compiled for this edgy machine.

[Rolf Leggewie (r0lf)]

still the same on gutsy 2.6.22-14-386

[Gareth Fitzworthington (mapping-gp-deactivatedaccount)]

Marking linux-sources > incomplete until upstream reports.

[Rolf Leggewie (r0lf)]

> Marking linux-sources > incomplete until upstream reports.

well, specifying what kind of reports and information you'd be looking for would certainly help. Reverting the change.

[Rolf Leggewie (r0lf)]

still the same on hardy

/# uname -a
Linux Rie 2.6.24-16-386 #1 Thu Apr 10 12:50:06 UTC 2008 i686 GNU/Linux
root@Rie:/# cat /proc/cpuinfo
processor : 0
vendor_id : CentaurHauls
cpu family : 6
model : 6
model name : VIA Samuel
stepping : 2
cpu MHz : 400.091

[Rolf Leggewie (r0lf)]

I guess this won't get fixed for anything pre-2.6.24

[Leann Ogasawara (leannogasawara)]

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.

[Launchpad Janitor (janitor)]

Per a decision made by the Ubuntu Kernel Team, bugs will longer be assigned to the ubuntu-kernel-team in Launchpad as part of the bug triage process. The ubuntu-kernel-team is being unassigned from this bug report. Refer to https://wiki.ubuntu.com/KernelTeamBugPolicies for more information. Thanks.

[Rolf Leggewie (r0lf)]

Unfortunately, Ubuntu no longer even supports booting from this nice little CPU beyond lucid. Obviously, this will not get fixed in Ubuntu. Marking as such.