On Friday 27 July 2007 17:52, Peter Valdemar Mørch wrote:
> Peter Valdemar Mørch swp5jhu02-at-sneakemail.com |Lists| wrote:
> > I'm seeing similar behavior. Changing channels causes a freeze so
> > it needs a push on the reset button.
>
> I have just today discovered, that if I boot the machine with "nosmp"
> as a kernel parameter to disable SMP, it does changes channels just
> fine.
>
> I was inspired to try this based on this troubleshooting tip:
> http://ivtvdriver.org/index.php/Troubleshooting#IVTV_may_cause_hangs_
>when_run_on_an_Intel_processor_with_Hyperthreading_enabled.
>
> If the other two that are also experiencing this are also on Intel
> Duo processors and disabling SMP works for them too, I guess that
> goes a long way to finding a root cause.
>
> At the very least, if I don't hear to the contrary, I'll modify the
> above troubleshooting section to include info about SMP for Intel
> processors along with hyper threading.
Do you have hyperthreading or a dual core processor? That hangs seems to
be specific to hyperthreading. Dual core should work. Well, I think
hyperthreading should also work, it's just that I never had a
hyperthreading CPU to test with.
That said, I've been able to reproduce this problem (I think) and it
seems to be related to a single firmware call. I'm currently stress
testing to see if that is indeed the case.
Watch this space :-)
Regards,
Hans
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