Timing error with kernel

What hardware is this?

Dual MMD 1.25 G4 with 2g of Apple stock memory--480G's drivespace in two
internal & two external firewire--ATI 9600PRO modified for G4
operation---Apple Pro keyboard & Logitech Trackball. Bought new during
first quarter of 2003. Only other non-Apple is a Belkin 5 port USB pci card.

DiegoCG wrote:
> What hardware is this?
>
>

Last Kernel that worked was 15-11. -12 onward has had this error.

DiegoCG wrote:
> What hardware is this?
>
>

As before--Dual Mirror-Door 1.25-mostly stock with 2G ram--Problem is still there with "new" kernel updated on 5/18 (-23 SMP)--Any ideas? Or is there a way I could regress to the -11 SMP kernel so I could use both processors? (do not have a copy of the -11 kernel after I reinstalled my system in early April)

under -23-PowerPC-SMP i see the same clock problem.

see also:
bug #44040

"New" kernel update on 5/23/2006 has the same problems--no change. Is there anything I can send to help correct this problem?

I have the same machine with the same problem. I looked through the smp kernel config file and noticed that the CONFIG_IRQ_ALL_CPUS option is set to y, which means interrupts are distributed across all cpus. I seem to remember in the back of my mind that some dual processor Power Macs had a problem with this and it needed to be set to route interrupts to the first cpu only. Another thing I noticed is that the nvram is not accessible with the smp kernel, CONFIG_NVRAM is set to m in the config and when I try to load the nvram module it fails. I did a quick google search on the error message and found this: http://patchwork.ozlabs.org/linuxppc/patch?id=5419
which seems to indicate that the nvram module should be compiled into the kernel instead of as a separate module. Perhaps someone can re-compile the kernel with these options corrected and see if it fixes the problem?

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 linux-source-2.6.15 kernel bug to the new "linux" package. We appreciate your patience and understanding as we make this transition. Also, if you would be interested in testing the upcoming Intrepid Ibex 8.10 release, it is available at http://www.ubuntu.com/testing . Please let us know your results. Thanks!