On Wed, 2009-10-14 at 09:54 +0100, Simon Farnsworth wrote: > Hello, > > I'm having problems with glitchy reception on a HVR-1600 card using > ClearQAM digital cable channels. Unfortunately, I'm remote from the box, > so can't describe the visual appearance, but I do have SSH access. > > Looking at the output of femon -c 100 (attached as femon.txt), I'm > seeing the occasional burst of UNC errors. I've attached dmesg as > dmesg.txt in case it gives any clues; the v4l drivers are as in kernel > 2.6.30 from Linus, with no extra patches. > > I'm using Xine to decode the channel - my channels.conf line for the > channel in question is: > WTAE:567012500:QAM_256:0:0:5 > > Any ideas? Have your remote user read http://www.ivtvdriver.org/index.php/Howto:Improve_signal_quality and take any actions that seem appropriate/easy. The in kernel mxl5005s driver is known to have about 3 dB worse performance for QAM vs 8-VSB (Steven Toth took some measurements once). If I had access to the mxl5005s datasheet and any programming manuals, I could probably fix this. However, I do not have them. Though, I have not asked MaxLinear for them either since I don't have cable at my home (yet). Regards, Andy -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
