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b-rad-NDi / Ubuntu-media-tree-kernel-builder

Slip stream the latest LinuxTV.org media drivers into an installable Ubuntu kernel package
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dvb-fe-tool and dvbsnoop do not work with ATSC QuadHD (20.04 hwe) #125

Open DougLung2000 opened 3 years ago

DougLung2000 commented 3 years ago

Using Hauppauge media kernel modules 5.8.0-492104061620-generic and linux-firmware-hauppauge Version: 0.1.7+focal with WinTV QuadHD on Ubuntu 20.04 hwe causes dvbsnoop to crash and returns incorrect data with dvb-fe-tool. 

dl1@dl1-X1-7th-Gen:~$ dvbsnoop -s signal
dvbsnoop V1.4.50 -- http://dvbsnoop.sourceforge.net/ 

---------------------------------------------------------
Transponder/Frequency signal strength statistics...
---------------------------------------------------------
Error(524): frontend ioctl: Unknown error 524 cycle: 1 d_time: 0.001 s
dl1@dl1-X1-7th-Gen:~$ dvb-fe-tool -m
Lock   (0x1f) C/N= 0.03dB UCB= 0
Lock   (0x1f) C/N= 0.04dB UCB= 0

Correct results are obtained with a Hauppauge WinTV dualHD and the same firmware and same Hauppauge media build kernel modules. dvbsnoop returns SNR x 10 and unscaled readings for signal level and BER and dvb-fe-tool -m returns lock status, signal level in dBm and SNR in dB with the WinTV dualHD.

I use these tools for monitoring DTV signals so having them working, at least dvb-fe-tool and dvbv5-zap would be nice on the quad tuner. 

    --Doug
b-rad-NDi commented 2 years ago

I will see if I can address this. I don't have a data sheet for the mxl chip though, so if there's something awry it might be difficult to address.