On Fri, 2010-12-03 at 20:47 -0800, joshr wrote: > AMD64, 2.6.35-23 (ubuntu), hvr1600 w/ TCL M30WTP-4N-E tuner > > OTA Digital works great out-of the-box. Analog has been a pita though. I've > tried forcing the tuner to a known working channel and dumped the mpeg > stream to a file for review. Everything turns up with a blank red screen. > Tried setting vmalloc=256M just for fun (it didn't seem to be a necessity) > but same results. Using mythtv's channel scanner, every single channel > scanned locks and is added to the database. Not even the channels that > should be working show up in LiveTV, though - just blank red screen. There > is no cable box involved here and the cable works just fine otherwise.
> Thoughts? Suggestions? Wild speculation? This has been reported before, but there is no known solution. <speculation type=mild> Either the CX23418's intergrated '843 Audio/Video decoder isn't converting the analog signals into video and audio properly, or the video data isn't successfuly getting written into the DDR RAM on the HVR-1600. </speculation> <speculation type=wild> The root cause may be: - some PCI bus errors during driver load that messes up the setup of the CX23418's A/V decoder or RAM controller. - you have a marginal or defective HVR-1600 or something about your systems' PCI bus or power is marginal. - some kernel bug somewhere trashing the the CX23418 register space. </speculation> If the problem is reliably reproducable you could: 1. Try the HVR-1600 in a Windows box to see if it is defective 2. Try the HVR-1600 under Windows on the problem machine 3. Remove all uneeded PCI cards and USB devices, and see if it works when there is less power draw by peripherials. 4. ensure you're not using the closed source drivers with your kernel. The CX23418 register space is 32 MB, That's a big target in kernel space for a kernel or driver bug to hit with an errant stray write. Those are just suggestions. None are guaranteed to be sane or make anything better. You can dump the cx23418's '843 register space (from 0x0 - 0x9ff) with v4l2-dbg. However IIRC, the last time someone provided that for the red screen problem, all the '843 registers looked OK. Regards, Andy _______________________________________________ ivtv-users mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-users
