[mythtv-users] Firewire bus occasionally locks while channel changing

[Norm Dressler]

Phil Linttell wrote:
>
> About once a week, my SA4250HD set-top box stops responding to 
> firewire channel change commands, and all subsequent recordings fail.  
> Plugreport shows nothing... no nodes at all.  However, if I just 
> unplug the firewire cable from the PCI card and then plug it back in, 
> everything starts working again.
>
> I don't use firewire for recording... the recording is being done over 
> USB using an HD-PVR.  I use majoridiot's mythchanger to change 
> channels (previously I used sa4250_ch, but was seeing the same 
> behaviour with it.)  I'm not sure I'm seeing what others refer to as a 
> "firewire bus hang", because attempts to reset the bus (using 
> mythchanger -R) fail.
>
> I'm wondering if there's a problem with my firewire PCI card or the 
> kernel drivers.  I get the following messages in dmesg:
> [    1.436951] ohci1394 0000:01:07.0: PCI INT A -> Link[LNKB] -> GSI 
> 17 (level, low) -> IRQ 17
> [    1.494038] ohci1394: fw-host0: OHCI-1394 1.0 (PCI): IRQ=[17]  
> MMIO=[fcfef800-fcfeffff]  Max Packet=[2]  IR/IT contexts=[4/8]
> [    1.502058] ohci1394: fw-host0: Serial EEPROM has suspicious 
> values, attempting to set max_packet_size to 512 bytes
> [    2.772990] ieee1394: Host added: ID:BUS[0-00:1023]  
> GUID[1d1600000000e332]
> [    2.790225] ieee1394: Node added: ID:BUS[0-01:1023]  
> GUID[001cea905acc0000]
> [    8.921223] ieee1394: raw1394: /dev/raw1394 device initialized
>
> The firewire adapter is a Pandex 3-port PCI card.  It's only used for 
> changing channels to this one STB.
>
> Has anyone seen similar behaviour?  Any thoughts how to keep my 
> firewire bus from disappearing?
>
I have the exact same behaviour with that same set top box and hd_pvr.  
I use the sa4250_ch script to change channels and on occasion it just 
forgets there is a device on the bus.  I run a reset.sh script that 
fixes the problem - I just haven't integrated it into the channel change 
script - here is the contents of the reset.sh file I use:
#!/bin/bash
modprobe -r sbp2 dv1394 ohci1394 raw1394 ieee1394
modprobe dv1394
modprobe ohci1394
modprobe raw1394
modprobe ieee1394

I see node removed but I don't see the other errors you are getting. 

Norm