[pvrusb2] Poor analog picture on HVR-1950 after upgrade to 2.6.28 kernel

[Mike Isely]

On Wed, 10 Jun 2009, Mike Isely wrote:

> On Fri, 5 Jun 2009, fivenote wrote:
> 
> > Mike,
> > 
> > I upgraded to kernel 2.6.28 (ubuntu jaunty). After the upgrade the
> > digital side of the HVR-1950 tuner looked great (even improved), but
> > the analog side has problems.
> > 
> > The picture seems zoomed and cut-off on the right side.
> 
> Just FYI for everyone else - Vincent also sent me an mpeg clip which 
> demonstrates the same issue.  The image is stretched to the right and 
> clipped.
> 
> 
> > 
> > I compiled and installed the latest v4l drivers and got the same
> > results. I tested by setting the card to "television" via sysctl and
> > playing via mplayer. I also tested with mythtv. I then plugged my
> > digital camera into the analog inputs and got the same poor picture
> > from the camera.
> > 
> > Is this a known problem? Can I provide more info or check anything else?
> 
> No, this is a new problem (or the return of a very old problem).  I 
> don't have an answer right now.
> 
> Just to be clear - this also happened with the stock 2.6.28 kernel you 
> got from ubuntu, with NO other v4l-dvb drivers or later pvrusb2 driver 
> added to it?  Yes I know you also tried v4l-dvb and the standalone 
> driver, but if you're seeing this *just* with the stuff in the 2.6.28 
> kernel then that narrows the search space quite a bit.
> 
> Given the nature of the symptoms, this should be a big problem to a lot 
> of people.  Has anyone else seen this?  I will try to reproduce it here 
> as well.

Again, has anyone else seen this?  (Scott's reply appears to be a 
different problem, which must be separately chased.)

Well I have some bad news - so far I'm unable to reproduce the problem.

I'm doing a capture with the (analog) composite input on an HVR-1950 
right now and the picture is perfect.  The source is a portable DVD 
player (in 4x3 mode) and I've even verified that the image aspect ratio 
is correct and that there's no clipping / cropping going on.

I've tested with vanilla kernels 2.6.28.7 and 2.6.29.3, both times using 
the stock in-kernel pvrusb2 driver.

At the moment I'm a bit at a loss here as to why you're seeing this.  If 
others can report this problem it might be helpful.

Vincent: Is there any way you could possibly build and try a vanilla 
kernel?  I don't run ubuntu here and I test against vanilla kernels.  
Obviously if a vanilla kernel works then that's not the entire solution 
but then we'll at least know that the problem must have to do with 
something the Ubuntu folks did when they built that kernel.

Also (though very unlikely as a cause), could you please post md5sum 
results for all the firmware on your system used by this driver?  On my 
Debian system, the firmware is in /usr/lib/hotplug/firmware and the 
files of interest for the HVR-1950 should be:

	v4l-cx25840.fw
	v4l-pvrusb2-73xxx-01.fw
	v4l-cx2341x-enc.fw

  -Mike


-- 

Mike Isely
isely @ isely (dot) net
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