[linux-dvb] Re: Hauppauge Nova-T 500 crash

Janne Grunau janne-dvb at grunau.be
Wed Dec 13 21:51:18 CET 2006


On Wednesday 13 December 2006 14:44, Robin Hill wrote:
> On Wed Dec 13, 2006 at 03:01:47PM +0200, Hamalainen, Jari wrote:
> >
> > Crashed again. Now the card was loaded with debug options.
> > I have attached the log of the crash.
>
> Yes, it's a known issue (though the root cause is, AFAIK, unknown). 
> For some reason the USB bus (on the card itself, so outside the
> direct control of the drivers) is getting a disconnect.

My current hypothesis is that the via usb host controller resets under 
some unknown conditions. Michael Krufky has one report of a similar 
issue with the DViCO FusionHDTV Dual Digital 2 which uses the same USB 
host controller. I found a post in an australian mce forum which 
suggests that the via usb chip s troublesome 
(http://www.xpmediacentre.com.au/community/tv-tuners-digital-analogue/15203-dvico-dual-4-a.html#post109478).

> Since the 
> DVB drivers don't handle hot-swapping, this causes a cascade of
> errors through to the application (including a kernel oops).  Short
> of help from Hauppauge, a major rewrite of the drivers, or a lot of
> trial & error, I'm not sure there's a solution in view :(

I don't think a driver rewrite will help. 

> Now I've disabled EIT scanning (in MythTV) I'm only seeing crashes
> every few weeks (as opposed to every day with it enabled).

I had not a single crash in the last two weeks. I use following patch to 
disable the eit scan for both the Nova-T 500 adapters: 
http://svn.mythtv.org/trac/ticket/2741

btw: disabling the scan on only one of the adapters didn't help.

Janne
>
> HTH,
>         Robin



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