awalls at radix
Jul 7, 2008, 5:08 PM
Post #2 of 7
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On Mon, 2008-07-07 at 15:57 +0200, Martin van Es wrote:
> Hi,
>
> I haven't caught up with the mailinglist for some time, so this
> problem may have been covered before, but the problem still exists in
> 2.6.25 so I thought it might be relevant nevertheless.
Here's a post the describes the same symptoms in a slightly different
setup with a VIA8237 chip as well:
http://ivtvdriver.org/pipermail/ivtv-users/2007-April/006332.html
It may give you more insight into your symptoms or at least provide some
comiseration.
-Andy
> I recently upgraded my VIA EPIA ML6000 mediacenter MB to a newer
> LN-1000. This sports a C7 proc and SATA RAID controller.
>
> Since the upgrade I've had some trouble getting the Hauppauge PVR-500
> to work. I got it to work eventually by disabling the APIC controller
> (noapic) and using polling interrupts (irqpoll) in the kernel.
>
> So far no problem, because I have a working system, but there are
> still some questions I'd like to put on this list:
>
> I read that irqpoll is not to be preferred, because this will ask all
> interrupt handlers if they want to serve the interrupt each time one
> occurs. Seems a waste of time to me. But without irqpoll I get the
> 'nobody cared (try booting with the "irqpoll" option)' error on
> accessing /dev/video0.
>
> Without the apic (noapic) my interrupts are configured as follows:
> $ cat /proc/interrupts
> CPU0
> 0: 270 XT-PIC-XT timer
> 1: 2 XT-PIC-XT i8042
> 2: 0 XT-PIC-XT cascade
> 5: 7085 XT-PIC-XT ehci_hcd:usb1, VIA8237, ivtv0, ivtv1
> 8: 2 XT-PIC-XT rtc
> 10: 96518 XT-PIC-XT uhci_hcd:usb2, uhci_hcd:usb3,
> eth0, via [at] pc:0000:01:00.0
> 11: 66316 XT-PIC-XT uhci_hcd:usb4, uhci_hcd:usb5
> 14: 3885 XT-PIC-XT ide0
> 15: 83 XT-PIC-XT ide1
> NMI: 0 Non-maskable interrupts
> LOC: 1306477 Local timer interrupts
> TRM: 0 Thermal event interrupts
> SPU: 0 Spurious interrupts
> ERR: 0
>
> with the apic it looks like this:
> CPU0
> 0: 63479 IO-APIC-edge timer
> 1: 8 IO-APIC-edge i8042
> 2: 0 XT-PIC-XT cascade
> 8: 2 IO-APIC-edge rtc
> 12: 0 IO-APIC-edge i8042
> 14: 1102 IO-APIC-edge ide0
> 15: 81 IO-APIC-edge ide1
> 18: 0 IO-APIC-fasteoi ivtv0, ivtv1
> 21: 20 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2,
> uhci_hcd:usb3, uhci_hcd:usb4, uhci_hcd:usb5
> 22: 0 IO-APIC-fasteoi VIA8237
> 23: 1452 IO-APIC-fasteoi eth0
> NMI: 0
> LOC: 63441
> ERR: 0
> MIS: 0
>
> To me, this looks a lot more sane, but in this situation only the
> second tuner (/dev/video1) works. If I do "cat /dev/video0" nothing
> happens (if I do the same for /dev/video1 I see the usual garbage).
> Depending on kernel and irqpoll I sometimes get the 'nobody cared'
> error, depending on kernel and ivtv version.
>
> I read some posts about the VIA RAID being a problem with ivtv, but
> disabling the RAID in BIOS doesn't help.
>
> So, is it sane to have ivtv0 and ivtv1 share the same interrupt? Why
> does it work with noapic/irqpoll and why does only the second tuner
> work if I use the apic, without irqpoll?
>
> Regards,
> Martin
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