Hi there,
I have an Asus Pundit-R barebones which I'm using with
Ubuntu Linux (kernel 2.6.12-10-686) and Avermedia 771
DVB-T card and MythTV as a PVR.
I recently upgraded to MythTV0.19 and had some
problems with tuning the channels.
After looking closer in the logs, I see that I am
getting IRQ lockups:
syslog:
Mar 22 19:05:57 localhost kernel: [4295474.720000]
bt878(0): irq FBUS risc_pc=366f5008
Mar 22 19:05:57 localhost last message repeated 71
times
Mar 22 19:05:57 localhost kernel: [4295474.720000]
bt878(0): IRQ lockup, cleared int mask
dmesg
[4295521.312000] bt878(0): irq FBUS risc_pc=3677b008
[4295521.312000] bt878(0): irq FBUS risc_pc=3677b008
[4295521.312000] bt878(0): IRQ lockup, cleared int
mask
It looks like the Avermedia card is sharing IRQ 17
with the ATI onboad sound. I changed the Avermedia
771 card to the only other PCI slot on the riser card
and it gives it the same IRQ as the ATI onboard
graphics card:
sgreszcz@myth:~$ cat /proc/interrupts
CPU0
0: 1867815 IO-APIC-edge timer
8: 1 IO-APIC-edge rtc
14: 16384 IO-APIC-edge ide0
15: 80414 IO-APIC-edge ide1
16: 177886 IO-APIC-level yenta,
radeon@pci:0000:01:05.0
17: 8779 IO-APIC-level bttv0, bt878, ATI IXP
18: 11332 IO-APIC-level ohci1394, eth0
19: 14676 IO-APIC-level ohci_hcd:usb1,
ohci_hcd:usb2, ehci_hcd:usb3
21: 1 IO-APIC-level acpi
NMI: 0
LOC: 1867223
ERR: 0
MIS: 0
I have been reading that the Avermedia 771 does not
like sharing IRQs. Is there any way to prevent this
IRQ lockup from happening?
Thanks!
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