[pvrusb2] pvrusb2-mci-20070114 radio support - stereo?

Mike Isely isely at isely.net
Fri Jan 19 22:17:42 CST 2007

Got it!  I've got stereo FM radio working now.  The root cause was a 
VIDIOC_S_TUNER command (which carried instructions to switch to stereo 
mode) which wasn't making it to the tuner core.

A new snapshot will be forthcoming.


On Fri, 19 Jan 2007, Rick Macdonald wrote:

> Rick Macdonald wrote:
> > OK, I installed the USB2 onto a WinXP laptop. The WinTV Radio program 
> > is stereo. A red STEREO 'led' lights up, and there's a MONO toggle 
> > button that does what it says. My original package just says "FM radio 
> > receiver". It doesn't mention stereo (but their web site does).
> >
> > I thought I've seen on the web where other devices such as my PVR-150 
> > explicitly state FM mono, but in most places it doesn't say either 
> > way. Rather than search again I think I'll boot up WinXP and see what 
> > happens. Not that the PVR-150 is of much interest to this list, but if 
> > it is also stereo under WinXP then the problem could be in low-level 
> > code shared by pvrusb2 and ivtv (or wherever it is).
> This is a resend - the first attempt never showed up.
> Well, I booted this PC into WinXP MCE and tried the internal
> WinTV-PVR-150 (26552 LF NTSC/NTSC-J with Conexant CX23416-22) and lo and
> behold, the FM radio is also stereo!
> So, my WinTV-PVR-150 plays FM mono through ivtv-radio (which just sets
> the frequency and then runs aplay -f dat < /dev/video24), and the
> PVR-USB2 plays FM mono with pvrusb2, but both devices are indeed stereo.
> But wait! After I booted back into Linux, my internal PVR-150 now plays
> stereo FM!
> Unfortunately, the USB2 is still giving me mono.
> I hope this helps.
> ...RickM...
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