[linux-dvb] Re: problem with 1.1.1 and VDR grab

[Klaus Schmidinger <Klaus.Schmidinger@cadsoft.de>]

Michael Hunold wrote:
> 
> Hello Peter,
> 
> On 03/12/04 10:22, Peter Siering wrote:
> >>Can you please send me oops?
> 
> > I am not sure, how to do that? May be just that:
> [...]
> 
> Yes, thanks.
> 
> >>Can you give me some informations about your system?
> >>- kernel version used
> >
> >
> > 2.4.24
> >
> >
> >>- kernel patches applied
> >
> >
> > plain Debian plus Gerd Knorrs V4L2 patches (as I wrote in my first post,
> > the same Kernel(+Patches) works as expected with DVB 1.1.0).
> 
> Sorry, I missed that piece of information.
> 
> Ok, but this explains your problems. Gerd Knorr regularly improves the
> v4l2 helper modules (like video-buf, v4l2-common or v4l1-compat) or
> incorporates my fixes.
> 
> He regularly creates patches against recent 2.4 kernels, but he
> *doesn't* create patches against older versions, ie. the patches against
> 2.4.24 and 2.4.25 contain differences.
> 
> When 2.4.25 came out, I took his latest improvements and incorporated it
> into the DVB tree. The problem now is, that the in-kernel modules for
> 2.4.24 are compiled against different header files than the DVB drivers
> from the release. This is screaming for problems.
> 
> One solution is to upgrade to 2.4.25 and use the CVS version of the
> "dvb-kernel" tree. (Not the release, because some bugfixes are missing)
> 
> Or you take 2.6.4 and apply the patches from the "patches-2.6" directory
> from "dvb-kernel" CVS.
> 
> >>I can confirm that 1.1.1 contains a bug that produces a kernel oops
> >>through the v4l1 compatibility layer when using "kvdr". Taking a
> >>snapshot via "space" then quitting the application will cause a kernel oops.
> >>
> >>I'm working on it, the fix for preventing the oops is easy. But it looks
> >>like "kvdr" needs to be changed in order to work after that change.
> 
> > If you like to, I could give it try.
> 
> I apologize for the current problems. The problems are due to the fact
> that most applications are still Video4Linux-1 specific, so all stuff
> goes through the compatibility layer until it reaches the DVB
> Video4Linux-2 driver. I recently added some resource management to get
> the driver more robust and a lot of hidden bugs are now triggered.
> 
> I admit that it was unfortunate to do this before the releases, but now
> we have to live with it. Be assured that I'm really interested to fix
> all these problems.
> 
> If you're not bound to 2.4, please try 2.6.4 and the patches I mentioned
> above. Otherwise update to 2.4.25 and use a recent CVS driver.
> 
> > Thanks,
> > Peter
> 
> CU
> Michael.

I was thinking about giving the new linux-dvb driver a try today, on
a SuSE 8.2 system with kernel 2.4.20 - but from what I see here there's
apparently so much confusion about this driver that I guess I'll rather
not waste time on this...

Klaus


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